{"id":473,"date":"2005-07-16T05:28:37","date_gmt":"2005-07-16T05:28:37","guid":{"rendered":"http:\/\/vafs.dungnq.local\/2005\/07\/16\/nang-suat-rung-trong-keo-lai-o-vung-dong-nam-bo-va-nhung-van-de-ky-thuat-lap-dia-can-quan-tam-2\/"},"modified":"2013-10-07T11:18:27","modified_gmt":"2013-10-07T04:18:27","slug":"nang-suat-rung-trong-keo-lai-o-vung-dong-nam-bo-va-nhung-van-de-ky-thuat-lap-dia-can-quan-tam-2","status":"publish","type":"post","link":"https:\/\/vafs.gov.vn\/vn\/nang-suat-rung-trong-keo-lai-o-vung-dong-nam-bo-va-nhung-van-de-ky-thuat-lap-dia-can-quan-tam-2\/","title":{"rendered":"N\u0102NG SU\u1ea4T R\u1eeaNG TR\u1ed2NG KEO LAI \u1ede V\u00d9NG \u0110\u00d4NG NAM B\u1ed8 V\u00c0 NH\u1eeeNG V\u1ea4N \u0110\u1ec0 K\u1ef8 THU\u1eacT – L\u1eacP \u0110\u1ecaA C\u1ea6N QUAN T\u00c2M"},"content":{"rendered":"

Ph\u1ea1m Th\u1ebf D\u0169ng*<\/a>, Ph\u1ea1m Vi\u1ebft T\u00f9ng<\/i><\/b><\/p>\n

Ng\u00f4 V\u0103n Ng\u1ecdc<\/i><\/b><\/p>\n

 <\/p>\n

\u0110\u00f4ng Nam B\u1ed9, v\u00f9ng kinh t\u1ebf tr\u1ecdng \u0111i\u1ec3m c\u1ee7a ph\u00eda Nam c\u00f3 ba t\u1ed5 ch\u1ee9c tr\u1ed3ng r\u1eebng cung c\u1ea5p nguy\u00ean li\u1ec7u gi\u1ea5y v\u1edbi qui m\u00f4 kh\u00e1 l\u1edbn \u0111\u00f3 l\u00e0: C\u00f4ng ty nguy\u00ean li\u1ec7u gi\u1ea5y mi\u1ec1n Nam (t\u1ec9nh \u0110\u1ed3ng Nai), L\u00e2m tr\u01b0\u1eddng Xuy\u00ean M\u1ed9c (t\u1ec9nh B\u00e0 R\u1ecba-V\u0169ng t\u1ea7u) v\u00e0 C\u00f4ng ty C\u1ed5 ph\u1ea7n H\u1ea3i V\u01b0\u01a1ng ( t\u1ec9nh B\u00ecnh Long). Th\u00e1ng 5 n\u0103m 2003 ch\u00fang t\u00f4i c\u00f3 d\u1ecbp kh\u1ea3o s\u00e1t ho\u1ea1t \u0111\u1ed9ng tr\u1ed3ng r\u1eebng \u1edf ba c\u01a1 s\u1edf n\u00e0y v\u00e0 ti\u1ebfn h\u00e0nh c\u00e1c \u0111i\u1ec1u tra c\u1ea7n thi\u1ebft v\u1edbi m\u1ee5c \u0111\u00edch kh\u00e1i qu\u00e1t \u0111\u01b0\u1ee3c n\u0103ng su\u1ea5t r\u1eebng tr\u1ed3ng s\u1ea3n xu\u1ea5t, c\u00e1c v\u1ea5n \u0111\u1ec1 li\u00ean quan \u0111\u1ebfn k\u1ef9 thu\u1eadt v\u00e0 l\u1eadp \u0111\u1ecba g\u00e2y tr\u1ed3ng r\u1eebng cung c\u1ea5p nguy\u00ean li\u1ec7u gi\u1ea5y. B\u00e0i vi\u1ebft t\u00f3m l\u01b0\u1ee3c c\u00e1c k\u1ebft qu\u1ea3 c\u1ee7a cu\u1ed9c \u0111i\u1ec1u tra.<\/p>\n

 <\/p>\n

I. M\u1ee5c ti\u00eau \u0111i\u1ec1u tra kh\u1ea3o s\u00e1t <\/span><\/h1>\n

 <\/p>\n

– X\u00e1c \u0111\u1ecbnh nguy\u00ean nh\u00e2n chuy\u1ec3n \u0111\u1ed5i c\u01a1 c\u1ea5u c\u00e2y tr\u1ed3ng l\u00e0m nguy\u00ean li\u1ec7u gi\u1ea5y ch\u00ednh trong v\u00f9ng t\u1eeb c\u00e1c lo\u00e0i c\u00e2y kh\u00e1c sang lo\u00e0i c\u00e2y keo lai (Hybrid acacia).<\/p>\n

– Xem x\u00e9t n\u0103ng su\u1ea5t r\u1eebng, k\u1ef9 thu\u1eadt g\u00e2y tr\u1ed3ng keo lai v\u00e0 \u0111\u1eb7c \u0111i\u1ec3m l\u1eadp \u0111\u1ecba.<\/p>\n

<\/h1>\n

 <\/p>\n

II. N\u1ed9i dung \u0111i\u1ec1u tra kh\u1ea3o s\u00e1t<\/span><\/h1>\n

 <\/p>\n

– Sinh tr\u01b0\u1edfng keo lai, k\u1ef9 thu\u1eadt \u00e1p d\u1ee5ng tr\u1ed3ng r\u1eebng<\/p>\n

– Di\u1ec5n bi\u1ebfn n\u0103ng su\u1ea5t r\u1eebng tr\u1ed3ng theo tu\u1ed5i v\u00e0 l\u1eadp \u0111\u1ecba g\u00e2y tr\u1ed3ng.<\/p>\n

– \u0110\u1eb7c \u0111i\u1ec3m l\u1eadp \u0111\u1ecba g\u00e2y tr\u1ed3ng<\/p>\n

<\/h1>\n

 <\/p>\n

III. Ph\u01b0\u01a1ng ph\u00e1p \u0111i\u1ec1u tra<\/span><\/h1>\n

 <\/p>\n

+ Ph\u01b0\u01a1ng ph\u00e1p ph\u1ecfng v\u1ea5n tr\u1ef1c ti\u1ebfp c\u00e1n b\u1ed9 qu\u1ea3n l\u00fd v\u00e0 c\u00e1n b\u1ed9 k\u1ef9 thu\u1eadt l\u00e2m nghi\u1ec7p t\u1ea1i c\u00e1c c\u01a1 s\u1edf tr\u1ed3ng r\u1eebng.<\/p>\n

+ Thi\u1ebft l\u1eadp \u00f4 \u0111i\u1ec1u tra \u0111i\u1ec3n h\u00ecnh \u0111\u1ea1i di\u1ec7n cho tu\u1ed5i r\u1eebng, d\u1ea1ng l\u1eadp \u0111\u1ecba v\u00e0 \u0111\u1eb7c tr\u01b0ng k\u1ef9 thu\u1eadt ri\u00eang bi\u1ec7t.<\/p>\n

+ K\u1ebft q\u1ee7a \u0111i\u1ec1u tra sinh tr\u01b0\u1edfng r\u1eebng \u0111\u01b0\u1ee3c t\u1ed5ng h\u1ee3p v\u00e0 t\u00ednh to\u00e1n b\u1eb1ng ph\u1ea7n m\u1ec1m EXELL.<\/p>\n

+ C\u00e1c ch\u1ec9 ti\u00eau ph\u00e2n t\u00edch \u0111\u1ea5t \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng theo ph\u01b0\u01a1ng ph\u00e1p ph\u00e2n t\u00edch th\u00f4ng d\u1ee5ng v\u1edbi c\u00f4ng c\u1ee5 m\u00e1y h\u1ea5p ph\u1ee5 nguy\u00ean t\u1eed v\u00e0 ph\u00e2n t\u00edch t\u1ea1i Ph\u00e2n vi\u1ec7n Khoa h\u1ecdc L\u00e2m nghi\u1ec7p Nam B\u1ed9.<\/p>\n

 <\/p>\n

IV. K\u1ebft qu\u1ea3 \u0111i\u1ec1u tra kh\u1ea3o s\u00e1t<\/b><\/p>\n

 <\/p>\n

    \n
      \n
    1. Ho\u1ea1t \u0111\u1ed9ng s\u1ea3n xu\u1ea5t c\u1ee7a ba c\u01a1 s\u1edf tr\u1ed3ng r\u1eebng v\u00e0 ch\u1ecdn lo\u00e0i c\u00e2y tr\u1ed3ng<\/i><\/b><\/li>\n<\/ol>\n<\/ol>\n

       <\/p>\n

      1.1 <\/i>L\u00e2m tr\u01b0\u1eddng Xuy\u00ean M\u1ed9c<\/i><\/p>\n

      – L\u00e0 m\u1ed9t doanh nhi\u1ec7p Nh\u00e0 n\u01b0\u1edbc, c\u00f3 433 ng\u01b0\u1eddi trong \u0111\u00f3 19 c\u00e1n b\u1ed9 qu\u1ea3n l\u00fd, 4 k\u0129 s\u01b0 l\u00e2m nghi\u1ec7p, 9 trung c\u1ea5p k\u1ef9 thu\u1eadt. Di\u1ec7n t\u00edch r\u1eebng tr\u1ed3ng hi\u1ec7n c\u00f3 6300ha trong \u0111\u00f3 c\u00f3 5900ha r\u1eebng tr\u1ed3ng nguy\u00ean li\u1ec7u gi\u1ea5y, 400ha r\u1eebng tr\u1ed3ng g\u1ed7 l\u1edbn (sao, d\u1ea7u, t\u1ebfch), \u0111\u1ea5t t\u01b0\u01a1ng \u0111\u1ed1i b\u1eb1ng ph\u1eb3ng, \u0111\u1ed9 d\u1ed1c <5 0<\/sup>. \u0110\u1ea5t c\u1ee7a l\u00e2m tr\u01b0\u1eddng ch\u1ee7 y\u1ebfu l\u00e0 \u0111\u1ea5t x\u00e1m pha c\u00e1t v\u1edbi \u0111\u1ed9 s\u00e2u t\u1ea7ng \u0111\u1ea5t kh\u00e1c nhau ph\u00e1t tri\u1ec3n tr\u00ean n\u1ec1n ph\u00f9 sa c\u1ed5 v\u00e0 lo\u1ea1i \u0111\u1ea5t \u0111\u1ecf, ph\u00e1t tri\u1ec3n tr\u00ean \u0111\u00e1 m\u00e1cma baz\u01a1.<\/p>\n

      – T\u1ea1i \u0111\u00e2y vi\u1ec7c tr\u1ed3ng r\u1eebng nguy\u00ean li\u1ec7u gi\u1ea5y \u0111\u00e3 \u1edf t\u1edbi chu k\u1ef3 th\u1ee9 5 v\u1edbi di\u1ec5n bi\u1ebfn lo\u00e0i c\u00e2y tr\u1ed3ng nh\u01b0 sau :th\u1eddi gian \u0111\u1ea7u l\u00e2m tr\u01b0\u1eddng tr\u1ed3ng b\u1ea1ch \u0111\u00e0n cao s\u1ea3n c\u00f3 ngu\u1ed3n g\u1ed1c t\u1eeb \u00dac (Eucaliptus). Do r\u1eebng tr\u1ed3ng b\u1ecb b\u1ec7nh, t\u00e1n r\u1eebng th\u01b0a l\u00e2m tr\u01b0\u1eddng chuy\u1ec3n sang tr\u1ed3ng lo\u00e0i keo l\u00e1 nh\u1ecf (A. auriculifrmis<\/i>). Khi c\u00e1c gi\u1ed1ng keo lai (Hybrid acacia) xu\u1ea5t hi\u1ec7n c\u00f3 t\u1ed1c \u0111\u1ed9 sinh tr\u01b0\u1edfng nhanh h\u01a1n, l\u00e2m tr\u01b0\u1eddng chuy\u1ec3n sang tr\u1ed3ng h\u1ea7u h\u1ebft l\u00e0 lo\u00e0i keo lai.<\/p>\n

      – V\u1ec1 n\u0103ng su\u1ea5t r\u1eebng; n\u0103ng su\u1ea5t b\u1ea1ch \u0111\u00e0n sau 5 n\u0103m ch\u1ec9 kho\u1ea3ng 10,8 m3<\/sup>\/ha\/n\u0103m (t\u01b0\u01a1ng \u1ee9ng 40 ste\u0111\u00f4i\/ha\/5 n\u0103m). C\u00f2n n\u0103ng su\u1ea5t r\u1eebng tr\u1ed3ng keo l\u00e1 nh\u1ecf t\u1eeb 15-21 m3<\/sup>\/ha\/n\u0103m (t\u01b0\u01a1ng \u1ee9ng 50 \u201370 ste \u0111\u00f4i\/ha\/4,5 n\u0103m). \u0110\u1ed1i v\u1edbi keo lai t\u1ef1 nhi\u00ean t\u1eeb h\u1ea1t n\u0103ng su\u1ea5t c\u00f3 th\u1ec3 27m3<\/sup>\/ha\/n\u0103m (t\u01b0\u01a1ng \u1ee9ng 90 ste \u0111\u00f4i\/ha\/4,5 n\u0103m).<\/p>\n

      – Ph\u01b0\u01a1ng th\u1ee9c tr\u1ed3ng r\u1eebng k\u1ebft h\u1ee3p s\u1ea3n xu\u1ea5t n\u00f4ng nghi\u1ec7p (lo\u00e0i c\u00e2y \u0111\u1eadu l\u1ea1c, \u0111\u1eadu xanh, ng\u00f4) t\u1eeb 1-2 n\u0103m sau khi tr\u1ed3ng \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng r\u1ea5t ph\u1ed5 bi\u1ebfn.<\/p>\n

      – S\u1ea3n ph\u1ea9m g\u1ed7 cung c\u1ea5p cho 3 c\u00f4ng ty l\u00e0 VIKO, VITAICO v\u00e0 c\u00f4ng ty Ph\u00fa \u0110\u00f4ng theo h\u1ee3p \u0111\u1ed3ng b\u00f3c v\u1ecf t\u1ea1i r\u1eebng cho t\u1ea5t c\u1ea3 c\u1ee1 \u0111\u01b0\u1eddng k\u00ednh c\u00e2y khi khai th\u00e1c.<\/p>\n

       <\/p>\n

      1.2 <\/i><\/b>C\u00f4ng ty nguy\u00ean li\u1ec7u gi\u1ea5y mi\u1ec1n Nam<\/i><\/b><\/p>\n

      – L\u00e0 m\u1ed9t doanh nghi\u1ec7p Nh\u00e0 n\u01b0\u1edbc, c\u00f4ng ty g\u1ed3m c\u00f3 3 x\u00ed nghi\u1ec7p gi\u1ed1ng, 4 x\u00ed nghi\u1ec7p tr\u1ed3ng r\u1eebng, c\u00f3 di\u1ec7n t\u00edch t\u1ea1i L\u00e2m \u0110\u1ed3ng 8000ha, \u0110\u1eafc L\u1eafc 4000ha, B\u00ecnh Thu\u1eadn h\u01a1n 1000ha v\u00e0 \u0110\u1ed3ng Nai h\u01a1n 1000ha. C\u00f4ng ty c\u00f3 800 CBCNV trong \u0111\u00f3 c\u00e1n b\u1ed9 qu\u1ea3n l\u00fd v\u00e0 k\u1ef9 thu\u1eadt c\u00f3 tr\u00ecnh \u0111\u1ed9 \u0111\u1ea1i h\u1ecdc v\u00e0 tr\u00ean \u0111\u1ea1i h\u1ecdc h\u01a1n 300 ng\u01b0\u1eddi.<\/p>\n

      – L\u1eadp \u0111\u1ecba tr\u1ed3ng r\u1eebng \u1edf \u0110\u1ed3ng Nai ch\u1ee7 y\u1ebfu l\u00e0 \u0111\u1ea5t x\u00e1m pha c\u00e1t ph\u00e1t tri\u1ec3n tr\u00ean ph\u00f9 sa c\u1ed5 (Haplic Acrisol \u2013 Ach) c\u00f3 t\u1ea7ng \u0111\u1ea5t v\u00e0 lo\u1ea1i \u0111\u1ea5t x\u00e1m feralit tr\u00ean phi\u1ebfn th\u1ea1ch s\u00e9t ( Feralic Acrisols \u2013Acf).<\/p>\n

      – V\u1ec1 lo\u00e0i c\u00e2y tr\u1ed3ng t\u1ea1i \u0110\u1ed3ng Nai: Tr\u01b0\u1edbc \u0111\u00e2y c\u00f4ng ty tr\u1ed3ng ch\u1ee7 y\u1ebfu B\u1ea1ch \u0111\u00e0n \u00dac, sau do t\u00ecnh h\u00ecnh b\u1ec7nh h\u1ea1i \u0111\u00e3 chuy\u1ec3n sang tr\u1ed3ng c\u00e1c lo\u00e0i keo v\u00e0 g\u1ea7n \u0111\u00e2y tr\u1ed3ng h\u1ea7u h\u1ebft l\u00e0 keo lai do lo\u00e0i n\u00e0y sinh tr\u01b0\u1edfng nhanh v\u00e0 \u0111\u00e1p \u1ee9ng \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u l\u00e0m nguy\u00ean li\u1ec7u gi\u1ea5y.<\/p>\n

      – V\u1ec1 n\u0103ng su\u1ea5t r\u1eebng tr\u1ed3ng keo lai, n\u0103ng su\u1ea5t c\u00f3 th\u1ec3 \u0111\u1ea1t t\u1eeb 8-15 m3<\/sup>\/ha\/n\u0103m n\u1ebfu tr\u1ed3ng b\u1eb1ng h\u1ea1t lai, v\u00e0 t\u1eeb 20-25 m3<\/sup>\/ha\/n\u0103m tr\u1ed3ng b\u1eb1ng hom \u0111\u00e3 qua tuy\u1ec3n ch\u1ecdn.<\/p>\n

      – Ph\u01b0\u01a1ng th\u1ee9c tr\u1ed3ng ch\u1ee7 y\u1ebfu l\u00e0 tr\u1ed3ng thu\u1ea7n lo\u1ea1i v\u00e0 k\u1ebft h\u1ee3p n\u00f4ng nghi\u1ec7p (\u0111\u1eadu ph\u1ee5ng, b\u1eafp) v\u00e0o n\u0103m \u0111\u1ea7u khi r\u1eebng ch\u01b0a kh\u00e9p t\u00e1n.<\/p>\n

      – C\u00f4ng ty \u0111\u00e3 \u00e1p d\u1ee5ng k\u1ef9 thu\u1eadt di\u1ec7t c\u1ecf b\u1eb1ng phun thu\u1ed1c h\u00f3a h\u1ecdc.<\/b><\/p>\n

       <\/p>\n

      1.3 <\/i><\/b>C\u00f4ng ty c\u1ed5 ph\u1ea7n H\u1ea3i V\u01b0\u01a1ng <\/i><\/b><\/p>\n

      – L\u00e0 doanh nghi\u1ec7p t\u01b0 nh\u00e2n ho\u1ea1t \u0111\u1ed9ng tr\u00ean nhi\u1ec1u l\u0129nh v\u1ef1c th\u01b0\u01a1ng m\u1ea1i trong \u0111\u00f3 c\u00f3 tr\u1ed3ng r\u1eebng cung c\u1ea5p nguy\u00ean li\u1ec7u gi\u1ea5y. Di\u1ec7n t\u00edch r\u1eebng hi\u1ec7n c\u00f3 3500ha g\u1ed3m 1400ha r\u1eebng b\u1ea1ch \u0111\u00e0n, kho\u1ea3ng 1000ha c\u00e1c lo\u1ea1i keo l\u00e1 nh\u1ecf, keo l\u01b0\u1ee1i li\u1ec1m v\u00e0 m\u1edbi tr\u1ed3ng 1100ha keo lai.<\/p>\n

      – C\u00f4ng ty c\u00f3 hai d\u1ea1ng \u0111\u1ea5t l\u00e0 \u0111\u1ea5t x\u00e1m pha c\u00e1t b\u1ea1c m\u1ea7u ph\u00e1t tri\u1ec3n ph\u00f9 sa c\u1ed5 v\u00e0 \u0111\u1ea5t \u0111\u1ecf tr\u00ean bazan nh\u01b0ng lo\u1ea1i \u0111\u1ea5t n\u00e0y c\u00f3 di\u1ec7n t\u00edch kh\u00f4ng nhi\u1ec1u.<\/p>\n

      – V\u1ec1 lo\u00e0i c\u00e2y tr\u1ed3ng, c\u00f4ng ty s\u1ebd t\u1eadp trung tr\u1ed3ng c\u00e2y keo lai v\u1edbi d\u1ef1 ki\u1ebfn n\u0103ng su\u1ea5t 25-30 m3<\/sup>\/ha\/n\u0103m, v\u00ec b\u1ea1ch \u0111\u00e0n ch\u1ec9 cho 80-90 m3<\/sup>\/ha\/6 n\u0103m \u1edf lu\u00e2n k\u1ef3 \u0111\u1ea7u v\u00e0 lu\u00e2n k\u1ef3 sau ch\u1ec9 40 m3<\/sup>\/ha\/5 n\u0103m.<\/p>\n

      – C\u00f4ng ty \u0111\u00e3 s\u1eed d\u1ee5ng ph\u00e2n b\u00f3n NPK, thu\u1ed1c di\u1ec7t c\u1ecf trong tr\u1ed3ng r\u1eebng v\u00e0 d\u1ef1 ki\u1ebfn lu\u00e2n k\u1ef3 tr\u1ed3ng keo lai s\u1ebd l\u00e0 6 n\u0103m v\u1edbi m\u1ee5c ti\u00eau \u0111\u1ea1t n\u0103ng su\u1ea5t 20 m3<\/sup>\/ha\/n\u0103m.<\/p>\n

       <\/p>\n

      Nh\u1eadn x\u00e9t <\/span><\/i><\/b><\/h3>\n

       <\/p>\n

      C\u00e1c \u0111\u01a1n v\u1ecb \u0111\u1ec1u ch\u1ecdn keo lai l\u00e0 lo\u00e0i c\u00e2y ch\u00ednh cho tr\u1ed3ng r\u1eebng nguy\u00ean li\u1ec7u gi\u1ea5y b\u1edfi n\u0103ng su\u1ea5t r\u1eebng t\u01b0\u01a1ng \u0111\u1ed1i cao so v\u1edbi c\u00e1c lo\u00e0i c\u00e2y b\u1ea1ch \u0111\u00e0n v\u00e0 keo l\u00e1 nh\u1ecf. M\u1ed9t s\u1ed1 n\u01a1i r\u1eebng tr\u1ed3ng \u0111\u00e3 c\u00f3 hi\u1ec7n t\u01b0\u1ee3ng n\u1ea5m b\u1ec7nh, tuy nhi\u00ean t\u00e1c h\u1ea1i kh\u00f4ng nhi\u1ec1u.<\/p>\n

      Ph\u01b0\u01a1ng th\u1ee9c \u0111\u1ed1t d\u01b0\u1edbi t\u00e1n r\u1eebng ph\u00f2ng ch\u00e1y tr\u01b0\u1edbc m\u00f9a kh\u00f4 \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng \u1edf Xuy\u00ean M\u1ed9c, Tr\u1ecb An c\u1ea7n ph\u1ea3i \u0111\u01b0\u1ee3c c\u00e2n nh\u1eafc v\u1ec1 nhi\u1ec1u kh\u00eda c\u1ea1nh k\u1ef9 thu\u1eadt c\u00f3 li\u00ean quan.<\/p>\n

       <\/p>\n

       <\/p>\n

        \n
          \n
        1. \u0110\u1ed9ng th\u00e1i sinh tr\u01b0\u1edfng keo lai theo tu\u1ed5i<\/i><\/b><\/li>\n<\/ol>\n<\/ol>\n

           <\/p>\n

          Sinh tr\u01b0\u1edfng c\u1ee7a r\u1eebng tr\u1ed3ng keo lai theo tu\u1ed5i r\u1eebng t\u1ea1i x\u00ed nghi\u1ec7p tr\u1ed3ng r\u1eebng Tr\u1ecb An, \u0110\u1ed3ng Nai \u2013 thu\u1ed9c C\u00f4ng ty nguy\u00ean li\u1ec7u gi\u1ea5y mi\u1ec1n Nam v\u1edbi m\u1eadt \u0111\u1ed9 tr\u1ed3ng r\u1eebng ban \u0111\u1ea7u l\u00e0 1666 c\u00e2y \/ha, c\u1ef1 li tr\u1ed3ng 3 x 2m, tr\u00ean \u0111\u1ea5t x\u00e1m pha c\u00e1t \u0111\u01b0\u1ee3c tr\u00ecnh b\u00e0y tr\u00ean b\u1ea3ng 1.<\/p>\n

           <\/p>\n

          B\u1ea3ng 1. \u0110\u1ed9ng th\u00e1i sinh tr\u01b0\u1edfng r\u1eebng keo lai t\u1ea1i Tr\u1ecb An- \u0110\u1ed3ng Nai<\/i><\/p>\n

           <\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
          \n

          N\u0103m tr\u1ed3ng –<\/b><\/b><\/p>\n

          Tu\u1ed5i r\u1eebng –<\/h5>\n

          \n

          S\u1ed1 \u00f4 \u0111i\u1ec1u tra<\/b><\/b><\/p>\n<\/td>\n

          		\n

          C\u1ef1 li<\/b><\/b><\/p>\n

          tr\u1ed3ng,m<\/b><\/b><\/p>\n

          \n<\/td>\n

          		\n

          T\u1ef7 l\u1ec7<\/b><\/b><\/p>\n

          s\u1ed1ng,%<\/b><\/b><\/p>\n

          \n<\/td>\n

          		\nT\u1ef7 l\u1ec7 \u0111a th\u00e2n,%<\/b><\/b><\/td>\n\n

          D1.3m,<\/b><\/b><\/p>\n

          cm<\/b><\/b><\/p>\n

          \n<\/td>\n

          		\n

          H,<\/b><\/b><\/p>\n

          m<\/b><\/b><\/p>\n

          \n<\/td>\n

          		\n

          M \u00f4<\/b><\/b><\/p>\n

          m3<\/sup><\/b><\/b><\/p>\n

          \n<\/td>\n

          		\n

          M\/ha<\/b><\/b><\/p>\n

          m3<\/sup><\/b><\/b><\/p>\n

          \n<\/td>\n

          		\n

          T\u0103ng tr\u01b0\u1edfng<\/b><\/b><\/p>\n

          m3<\/sup>\/ha\/n\u0103m<\/b><\/b><\/p>\n

          \n<\/td>\n

          		<\/td>\n<\/tr>\n
          \n

          1 th\u00e2n<\/b><\/b><\/p>\n

          \n<\/td>\n

          		\n

          2 th\u00e2n<\/b><\/b><\/p>\n

          \n<\/td>\n

          		\n

          3 th\u00e2n<\/b><\/b><\/p>\n

          \n<\/td>\n

          		<\/td>\n<\/tr>\n
          <\/td>\n<\/tr>\n
          \n

          2002-1 tu\u1ed5i<\/b><\/b><\/p>\n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		<\/td>\n<\/tr>\n
          \n

          4<\/b><\/b><\/p>\n<\/td>\n

          		\n

          3×2<\/p>\n<\/td>\n

          		\n

          97.5<\/p>\n<\/td>\n

          		\n

          75<\/p>\n<\/td>\n

          		\n

          23<\/p>\n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          3.40<\/p>\n<\/td>\n

          		\n

          4.60<\/p>\n<\/td>\n

          		\n

          0.146<\/p>\n<\/td>\n

          		\n

          6.080<\/p>\n<\/td>\n

          		\n

          6.080<\/p>\n<\/td>\n

          		<\/td>\n<\/tr>\n
          \n

          3<\/b><\/b><\/p>\n<\/td>\n

          		\n

          3×2<\/p>\n<\/td>\n

          		\n

          95<\/p>\n<\/td>\n

          		\n

          75<\/p>\n<\/td>\n

          		\n

          33.3<\/p>\n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          3.51<\/p>\n<\/td>\n

          		\n

          4.72<\/p>\n<\/td>\n

          		\n

          0.158<\/p>\n<\/td>\n

          		\n

          6.580<\/p>\n<\/td>\n

          		\n

          6.580<\/p>\n<\/td>\n

          		<\/td>\n<\/tr>\n
          \n

          TB<\/b><\/b><\/p>\n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          3.46<\/b><\/b><\/p>\n<\/td>\n

          		\n

          4.66<\/b><\/b><\/p>\n<\/td>\n

          		\n

          0.152<\/b><\/b><\/p>\n<\/td>\n

          		\n

          6.330<\/b><\/b><\/p>\n<\/td>\n

          		\n

          6.330<\/b><\/b><\/p>\n<\/td>\n

          		<\/td>\n<\/tr>\n
          \n

          20001 – 2 tu\u1ed5i<\/b><\/b><\/p>\n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		<\/td>\n<\/tr>\n
          \n

          1<\/b><\/b><\/p>\n<\/td>\n

          		\n

          3×2<\/p>\n<\/td>\n

          		\n

          82.5<\/p>\n<\/td>\n

          		\n

          75.7<\/p>\n<\/td>\n

          		\n

          24.2<\/p>\n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          5.25<\/p>\n<\/td>\n

          		\n

          6.75<\/p>\n<\/td>\n

          		\n

          0.363<\/p>\n<\/td>\n

          		\n

          20.167<\/p>\n<\/td>\n

          		\n

          10.083<\/p>\n<\/td>\n

          		<\/td>\n<\/tr>\n
          \n

          2<\/b><\/b><\/p>\n<\/td>\n

          		\n

          3×2<\/p>\n<\/td>\n

          		\n

          82.5<\/p>\n<\/td>\n

          		\n

          50<\/p>\n<\/td>\n

          		\n

          39.4<\/p>\n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          6.50<\/p>\n<\/td>\n

          		\n

          7.63<\/p>\n<\/td>\n

          		\n

          0.653<\/p>\n<\/td>\n

          		\n

          36.278<\/p>\n<\/td>\n

          		\n

          18.139<\/p>\n<\/td>\n

          		<\/td>\n<\/tr>\n
          \n

          TB<\/b><\/b><\/p>\n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          5.88<\/b><\/b><\/p>\n<\/td>\n

          		\n

          7.19<\/b><\/b><\/p>\n<\/td>\n

          		\n

          0.508<\/b><\/b><\/p>\n<\/td>\n

          		\n

          28.222<\/b><\/b><\/p>\n<\/td>\n

          		\n

          14.111<\/b><\/b><\/p>\n<\/td>\n

          		<\/td>\n<\/tr>\n
          \n

          2000- 3 tu\u1ed5i<\/b><\/b><\/p>\n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		<\/td>\n<\/tr>\n
          \n

          10<\/b><\/b><\/p>\n<\/td>\n

          		\n

          3×2<\/p>\n<\/td>\n

          		\n

          92.5<\/p>\n<\/td>\n

          		\n

          80<\/p>\n<\/td>\n

          		\n

          13.5<\/p>\n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          8.85<\/p>\n<\/td>\n

          		\n

          11.35<\/p>\n<\/td>\n

          		\n

          1.496<\/p>\n<\/td>\n

          		\n

          62.333<\/p>\n<\/td>\n

          		\n

          20.778<\/p>\n<\/td>\n

          		<\/td>\n<\/tr>\n
          \n

          11<\/b><\/b><\/p>\n<\/td>\n

          		\n

          3×2<\/p>\n<\/td>\n

          		\n

          97.5<\/p>\n<\/td>\n

          		\n

          87.1<\/p>\n<\/td>\n

          		\n

          12.8<\/p>\n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          8.72<\/p>\n<\/td>\n

          		\n

          11.28<\/p>\n<\/td>\n

          		\n

          1.516<\/p>\n<\/td>\n

          		\n

          63.167<\/p>\n<\/td>\n

          		\n

          21.056<\/p>\n<\/td>\n

          		<\/td>\n<\/tr>\n
          \n

          TB<\/b><\/b><\/p>\n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          8.79<\/b><\/b><\/p>\n<\/td>\n

          		\n

          11.32<\/b><\/b><\/p>\n<\/td>\n

          		\n

          1.506<\/b><\/b><\/p>\n<\/td>\n

          		\n

          62.750<\/b><\/b><\/p>\n<\/td>\n

          		\n

          20.917<\/b><\/b><\/p>\n<\/td>\n

          		<\/td>\n<\/tr>\n
          \n

          1999- 4 tu\u1ed5i<\/b><\/b><\/p>\n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		<\/td>\n<\/tr>\n
          \n

          5<\/b><\/b><\/p>\n<\/td>\n

          		\n

          3×2<\/p>\n<\/td>\n

          		\n

          82.5<\/p>\n<\/td>\n

          		\n

          87.8<\/p>\n<\/td>\n

          		\n

          12.1<\/p>\n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          9.82<\/p>\n<\/td>\n

          		\n

          13.56<\/p>\n<\/td>\n

          		\n

          1.9<\/p>\n<\/td>\n

          		\n

          79.167<\/p>\n<\/td>\n

          		\n

          19.792<\/p>\n<\/td>\n

          		<\/td>\n<\/tr>\n
          \n

          6<\/b><\/b><\/p>\n<\/td>\n

          		\n

          3×2<\/p>\n<\/td>\n

          		\n

          75<\/p>\n<\/td>\n

          		\n

          93.3<\/p>\n<\/td>\n

          		\n

          6.6<\/p>\n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          11.22<\/p>\n<\/td>\n

          		\n

          14.31<\/p>\n<\/td>\n

          		\n

          2.205<\/p>\n<\/td>\n

          		\n

          91.875<\/p>\n<\/td>\n

          		\n

          22.969<\/p>\n<\/td>\n

          		<\/td>\n<\/tr>\n
          \n

          TB<\/b><\/b><\/p>\n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          10.52<\/b><\/b><\/p>\n<\/td>\n

          		\n

          13.94<\/b><\/b><\/p>\n<\/td>\n

          		\n

          2.0525<\/b><\/b><\/p>\n<\/td>\n

          		\n

          85.521<\/b><\/b><\/p>\n<\/td>\n

          		\n

          21.380<\/b><\/b><\/p>\n<\/td>\n

          		<\/td>\n<\/tr>\n
          \n

          1998- 5 tu\u1ed5i<\/b><\/b><\/p>\n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		<\/td>\n<\/tr>\n
          \n

          8<\/b><\/b><\/p>\n<\/td>\n

          		\n

          3×2<\/p>\n<\/td>\n

          		\n

          70.8<\/p>\n<\/td>\n

          		\n

          41.1<\/p>\n<\/td>\n

          		\n

          52.9<\/p>\n<\/td>\n

          		\n

          5.8<\/p>\n<\/td>\n

          		\n

          13.17<\/p>\n<\/td>\n

          		\n

          15.64<\/p>\n<\/td>\n

          		\n

          5.41<\/p>\n<\/td>\n

          		\n

          154<\/p>\n<\/td>\n

          		\n

          30.78<\/p>\n<\/td>\n

          		<\/td>\n<\/tr>\n
          \n

          9<\/b><\/b><\/p>\n<\/td>\n

          		\n

          3×2<\/p>\n<\/td>\n

          		\n

          57.7<\/p>\n<\/td>\n

          		\n

          56.6<\/p>\n<\/td>\n

          		\n

          36.6<\/p>\n<\/td>\n

          		\n

          6.6<\/p>\n<\/td>\n

          		\n

          11.83<\/p>\n<\/td>\n

          		\n

          14.80<\/p>\n<\/td>\n

          		\n

          3.39<\/p>\n<\/td>\n

          		\n

          108.7<\/p>\n<\/td>\n

          		\n

          21.73<\/p>\n<\/td>\n

          		<\/td>\n<\/tr>\n
          \n

          TB<\/b><\/b><\/p>\n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          \n<\/td>\n

          		\n

          12.50<\/b><\/b><\/p>\n<\/td>\n

          		\n

          15.22<\/b><\/b><\/p>\n<\/td>\n

          		\n

          4.4<\/b><\/b><\/p>\n<\/td>\n

          		\n

          131.35<\/b><\/b><\/p>\n<\/td>\n

          		\n

          26.255<\/b><\/b><\/p>\n<\/td>\n

          		<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

           <\/p>\n

          S\u01a1 \u0111\u1ed3 1. N\u0103ng su\u1ea5t r\u1eebng keo lai theo tu\u1ed5i t\u1ea1i Tr\u1ecb An- \u0110\u1ed3ng Nai<\/i><\/p>\n

          \n

           <\/p>\n

          Thi\u1ebft l\u1eadp t\u01b0\u01a1ng quan gi\u1eefa tu\u1ed5i v\u00e0 n\u0103ng su\u1ea5t r\u1eebng keo lai t\u1ea1i Tr\u1ecb An \u0111\u01b0\u1ee3c m\u00f4 t\u1ea3 qua ph\u01b0\u01a1ng tr\u00ecnh :<\/p>\n

          Y = 0,8676A2<\/sup> + 9,9172A-2,4084 . Trong \u0111\u00f3 :<\/p>\n

          – Y : N\u0103ng su\u1ea5t r\u1eebng tr\u1ed3ng keo lai, m3<\/sup>\/ha\/n\u0103m.<\/p>\n

          – A: Tu\u1ed5i r\u1eebng tr\u1ed3ng, n\u0103m.<\/p>\n

          Ph\u01b0\u01a1ng tr\u00ecnh c\u00f3 h\u1ec7 s\u1ed1 t\u01b0\u01a1ng quan R2<\/sup> kh\u00e1 cao : 0,9724<\/p>\n

           <\/p>\n

          H\u00ecnh 1. T\u01b0\u01a1ng quan gi\u1eefa n\u0103ng su\u1ea5t v\u00e0 tu\u1ed5i r\u1eebng keo lai t\u1ea1i Tr\u1ecb An- \u0110\u1ed3ng Nai<\/i><\/p>\n

          \n

          Nh\u1eadn x\u00e9t<\/b> <\/i><\/p>\n

          -Trong kho\u1ea3ng 3 n\u0103m \u0111\u1ea7u c\u00e2y sinh tr\u01b0\u1edfng kh\u00e1 nhanh c\u1ea3 v\u1ec1 ch\u1ec9 s\u1ed1 \u0111\u01b0\u1eddng k\u00ednh v\u00e0 chi\u1ec1u cao.<\/p>\n

          -T\u1eeb n\u0103m th\u1ee9 3 sinh tr\u01b0\u1edfng b\u1eaft \u0111\u1ea7u ch\u1eadm l\u1ea1i, v\u00ec r\u1eebng \u0111\u00e3 kh\u00e9p t\u00e1n.<\/p>\n

           <\/p>\n

           <\/p>\n

            \n
              \n
            1. \u1ea2nh h\u01b0\u1edfng c\u1ee7a m\u1eadt \u0111\u1ed9 tr\u1ed3ng r\u1eebng \u0111\u1ebfn sinh tr\u01b0\u1edfng keo lai<\/i><\/b><\/li>\n<\/ol>\n<\/ol>\n

               <\/p>\n

              K\u1ebft qu\u1ea3 \u0111i\u1ec1u tra sinh tr\u01b0\u1edfng r\u1eebng keo lai c\u00f3 m\u1eadt \u0111\u1ed9 tr\u1ed3ng kh\u00e1c nhau v\u1edbi c\u00f9ng bi\u1ec7n ph\u00e1p k\u1ef9 thu\u1eadt v\u00e0 tr\u00ean c\u00f9ng m\u1ed9t lo\u1ea1i \u0111\u1ea5t l\u00e0 \u0111\u1ea5t x\u00e1m b\u1ea1c m\u00e0u pha c\u00e1t t\u1ea1i r\u1eebng tr\u1ed3ng c\u1ee7a C\u00f4ng ty H\u1ea3i V\u01b0\u01a1ng, t\u1ec9nh B\u00ecnh Long \u0111\u01b0\u1ee3c tr\u00ecnh b\u00e0y trong b\u1ea3ng 2, h\u00ecnh 2 v\u00e0 3.<\/p>\n

               <\/p>\n

              B\u1ea3ng 2. Sinh tr\u01b0\u1edfng v\u00e0 n\u0103ng su\u1ea5t r\u1eebng keo lai theo m\u1eadt \u0111\u1ed9 tr\u1ed3ng r\u1eebng<\/i><\/p>\n

              \n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
              \n

              N\u0103m tr\u1ed3ng-<\/b><\/b><\/p>\n

              Tu\u1ed5i-<\/b><\/b><\/p>\n

              Ph\u00e2n tr\u01b0\u1eddng<\/b><\/b><\/p>\n<\/td>\n

              		\n

              M\u1eadt \u0111\u1ed9<\/b><\/b><\/p>\n

              c\u00e2y\/ha<\/b><\/b><\/p>\n<\/td>\n

              		\n

              C\u1ef1 li<\/b><\/b><\/p>\n

              tr\u1ed3ng,m<\/b><\/b><\/p>\n<\/td>\n

              		\n

              T\u1ef7 l\u1ec7<\/b><\/b><\/p>\n

              s\u1ed1ng,%<\/b><\/b><\/p>\n<\/td>\n

              		\n

              T\u1ef7 l\u1ec7 \u0111a th\u00e2n, %<\/b><\/b><\/p>\n<\/td>\n

              		\n

              D1.3 tb,<\/b><\/b><\/p>\n

              Cm<\/b><\/b><\/p>\n<\/td>\n

              		\n
              H,m<\/span><\/h6>\n<\/td>\n
              		\n

              M\/ha<\/b><\/b><\/p>\n

              ,m3<\/sup><\/b><\/b><\/p>\n<\/td>\n

              		\n

              T\u0103ng tr\u01b0\u1edfng<\/b><\/b><\/p>\n

              m3<\/sup>\/ha\/n\u0103m<\/b><\/b><\/p>\n<\/td>\n

              		<\/td>\n<\/tr>\n
              \n

              1 th\u00e2n<\/b><\/b><\/p>\n<\/td>\n

              		\n

              2 th\u00e2n<\/b><\/b><\/p>\n<\/td>\n

              		<\/td>\n<\/tr>\n
              <\/td>\n<\/tr>\n
              <\/td>\n<\/tr>\n
              \n

              2001-2 tu\u1ed5i<\/b><\/b><\/p>\n<\/td>\n

              		\n <\/td>\n\n <\/td>\n\n <\/td>\n\n <\/td>\n\n <\/td>\n\n <\/td>\n\n <\/td>\n\n <\/td>\n\n <\/td>\n<\/td>\n<\/tr>\n
              \n

              II<\/b><\/b><\/p>\n<\/td>\n

              		\n

              952<\/p>\n<\/td>\n

              		\n

              3.5 x 3<\/p>\n<\/td>\n

              		\n

              85<\/b><\/b><\/p>\n<\/td>\n

              		\n

              91<\/b><\/b><\/p>\n<\/td>\n

              		\n

              6<\/b><\/b><\/p>\n<\/td>\n

              		\n

              7.58<\/b><\/b><\/p>\n<\/td>\n

              		\n

              7.71<\/b><\/b><\/p>\n<\/td>\n

              		\n

              19.472<\/b><\/b><\/p>\n<\/td>\n

              		\n

              9.736<\/b><\/b><\/p>\n<\/td>\n

              		<\/td>\n<\/tr>\n
              \n

              \n<\/td>\n

              		\n

              \n<\/td>\n

              		\n

              \n<\/td>\n

              		\n

              \n<\/td>\n

              		\n

              \n<\/td>\n

              		\n

              \n<\/td>\n

              		\n

              \n<\/td>\n

              		\n

              \n<\/td>\n

              		\n

              \n<\/td>\n

              		\n

              \n<\/td>\n

              		<\/td>\n<\/tr>\n
              \n

              III<\/b><\/b><\/p>\n<\/td>\n

              		\n

              1111<\/p>\n<\/td>\n

              		\n

              3 x 3<\/p>\n<\/td>\n

              		\n

              85<\/p>\n<\/td>\n

              		\n

              82<\/p>\n<\/td>\n

              		\n

              18<\/p>\n<\/td>\n

              		\n

              8.49<\/p>\n<\/td>\n

              		\n

              9.02<\/p>\n<\/td>\n

              		\n

              29.222<\/p>\n<\/td>\n

              		\n

              14.611<\/p>\n<\/td>\n

              		<\/td>\n<\/tr>\n
              \n

              \n<\/td>\n

              		\n

              \n<\/td>\n

              		\n

              3 x 3<\/p>\n<\/td>\n

              		\n

              90<\/p>\n<\/td>\n

              		\n

              100<\/p>\n<\/td>\n

              		\n

              \n<\/td>\n

              		\n

              8.35<\/p>\n<\/td>\n

              		\n

              8.96<\/p>\n<\/td>\n

              		\n

              25.694<\/p>\n<\/td>\n

              		\n

              12.847<\/p>\n<\/td>\n

              		<\/td>\n<\/tr>\n
              \n

              \n<\/td>\n

              		\n

              \n<\/td>\n

              		\n

              3 x 3<\/p>\n<\/td>\n

              		\n

              98<\/p>\n<\/td>\n

              		\n

              100<\/p>\n<\/td>\n

              		\n

              \n<\/td>\n

              		\n

              8.09<\/p>\n<\/td>\n

              		\n

              8.84<\/p>\n<\/td>\n

              		\n

              25.611<\/p>\n<\/td>\n

              		\n

              12.806<\/p>\n<\/td>\n

              		<\/td>\n<\/tr>\n
              \n

              Trung b\u00ecnh<\/p>\n<\/td>\n

              		\n

              \n<\/td>\n

              		\n

              \n<\/td>\n

              		\n

              91<\/b><\/b><\/p>\n<\/td>\n

              		\n

              94<\/b><\/b><\/p>\n<\/td>\n

              		\n

              \n<\/td>\n

              		\n

              8.31<\/b><\/b><\/p>\n<\/td>\n

              		\n

              8.94<\/b><\/b><\/p>\n<\/td>\n

              		\n

              26.843<\/b><\/b><\/p>\n<\/td>\n

              		\n

              13.421<\/b><\/b><\/p>\n<\/td>\n

              		<\/td>\n<\/tr>\n
              \n

              2000-3 tu\u1ed5i<\/b><\/b><\/p>\n<\/td>\n

              		\n

              \n<\/td>\n

              		\n

              \n<\/td>\n

              		\n

              \n<\/td>\n

              		\n

              \n<\/td>\n

              		\n

              \n<\/td>\n

              		\n

              \n<\/td>\n

              		\n

              \n<\/td>\n

              		\n

              \n<\/td>\n

              		\n

              \n<\/td>\n

              		<\/td>\n<\/tr>\n
              \n

              II<\/b><\/b><\/p>\n<\/td>\n

              		\n

              833<\/p>\n<\/td>\n

              		\n

              6 x 2<\/p>\n<\/td>\n

              		\n

              90<\/b><\/b><\/p>\n<\/td>\n

              		\n

              89<\/b><\/b><\/p>\n<\/td>\n

              		\n

              11<\/b><\/b><\/p>\n<\/td>\n

              		\n

              10.38<\/b><\/b><\/p>\n<\/td>\n

              		\n

              11.32<\/b><\/b><\/p>\n<\/td>\n

              		\n

              38.870<\/b><\/b><\/p>\n<\/td>\n

              		\n

              12.950<\/b><\/b><\/p>\n<\/td>\n

              		<\/td>\n<\/tr>\n
              \n

              II<\/b><\/b><\/p>\n<\/td>\n

              		\n

              1142<\/p>\n<\/td>\n

              		\n

              3.5 x 2.5<\/p>\n<\/td>\n

              		\n

              90<\/b><\/b><\/p>\n<\/td>\n

              		\n

              69<\/b><\/b><\/p>\n<\/td>\n

              		\n

              31<\/b><\/b><\/p>\n<\/td>\n

              		\n

              8.56<\/b><\/b><\/p>\n<\/td>\n

              		\n

              9.35<\/b><\/b><\/p>\n<\/td>\n

              		\n

              43.310<\/b><\/b><\/p>\n<\/td>\n

              		\n

              14.440<\/b><\/b><\/p>\n<\/td>\n

              		<\/td>\n<\/tr>\n
              \n

              II<\/b><\/b><\/p>\n<\/td>\n

              		\n

              1666<\/p>\n<\/td>\n

              		\n

              3 x 2<\/p>\n<\/td>\n

              		\n

              98<\/b><\/b><\/p>\n<\/td>\n

              		\n

              85<\/b><\/b><\/p>\n<\/td>\n

              		\n

              15<\/b><\/b><\/p>\n<\/td>\n

              		\n

              8.82<\/b><\/b><\/p>\n<\/td>\n

              		\n

              10.72<\/b><\/b><\/p>\n<\/td>\n

              		\n

              63.250<\/b><\/b><\/p>\n<\/td>\n

              		\n

              21.080<\/b><\/b><\/p>\n<\/td>\n

              		<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

               <\/p>\n

              H\u00ecnh 2. N\u0103ng su\u1ea5t r\u1eebng theo m\u1eadt \u0111\u1ed9 tr\u1ed3ng \u1edf tu\u1ed5i 2<\/i> <\/span><\/h4>\n

               <\/p>\n

               <\/p>\n

              \n

               <\/p>\n

              H\u00ecnh 3. N\u0103ng su\u1ea5t r\u1eebng theo m\u1eadt \u0111\u1ed9 tr\u1ed3ng \u1edf tu\u1ed5i 3<\/i> <\/span><\/h4>\n

               <\/p>\n

               <\/p>\n

              \n

               <\/p>\n

              Nh\u1eadn x\u00e9t<\/span><\/i><\/h1>\n

               <\/p>\n

              M\u1eb7c d\u00f9 tr\u1eef l\u01b0\u1ee3ng v\u00e0 n\u0103ng su\u1ea5t r\u1eebng cao nh\u1ea5t thu\u1ed9c v\u1ec1 m\u1eadt \u0111\u1ed9 c\u00e2y tr\u1ed3ng d\u00e0y h\u01a1n, nh\u01b0ng t\u1eeb n\u0103m th\u1ee9 ba, nh\u1ecbp \u0111\u1ed9 sinh tr\u01b0\u1edfng gi\u1ea3m d\u1ea7n d\u1eabn \u0111\u1ebfn tr\u1eef l\u01b0\u1ee3ng gi\u1ea3m \u0111i khi c\u00e2y \u0111i v\u00e0o th\u1eddi gian c\u1ea1nh tranh kh\u00f4ng gian dinh d\u01b0\u1ee1ng. L\u00fac n\u00e0y \u01b0u th\u1ebf sinh tr\u01b0\u1edfng s\u1ebd thu\u1ed9c n\u01a1i tr\u1ed3ng th\u01b0a h\u01a1n. Nh\u01b0 v\u1eady n\u00ean \u00e1p d\u1ee5ng tr\u1ed3ng r\u1eebng trong kho\u1ea3ng m\u1eadt \u0111\u1ed9 t\u1eeb 1111 c\u00e2y \u2013 1666 c\u00e2y s\u1ebd ti\u1ebft ki\u1ec7m gi\u1ed1ng, c\u00f4ng tr\u1ed3ng, ch\u0103m s\u00f3c v\u00e0 n\u0103ng su\u1ea5t r\u1eebng cao h\u01a1n.<\/p>\n

               <\/p>\n

              4. \u0110\u1eb7c \u0111i\u1ec3m \u0111\u1ea5t v\u00e0 sinh tr\u01b0\u1edfng r\u1eebng tr\u1ed3ng keo lai<\/i><\/b><\/p>\n

              Trong ba lo\u1ea1i \u0111\u1ea5t c\u00f3 di\u1ec7n t\u00edch ph\u00e2n b\u1ed1 kh\u00e1 l\u1edbn \u1edf v\u00f9ng \u0110\u00f4ng Nam B\u1ed9, \u0111\u1ea5t x\u00e1m b\u1ea1c m\u00e0u (Haplic Acrisols – Ach) pha c\u00e1t v\u1edbi t\u1ea7ng \u0111\u1ea5t d\u00e0y m\u1ecfng kh\u00e1c nhau, ph\u00e1t tri\u1ec3n tr\u00ean ph\u00f9 sa c\u1ed5 c\u00f3 di\u1ec7n t\u00edch kh\u00e1 l\u1edbn, k\u1ebf \u0111\u1ebfn l\u00e0 lo\u1ea1i \u0111\u1ea5t n\u00e2u \u0111\u1ecf (Rhodic Ferralsols- FRr) ph\u00e1t tri\u1ec3n tr\u00ean \u0111\u00e1 m\u00e1cma baz\u01a1. Tuy nhi\u00ean, lo\u1ea1i \u0111\u1ea5t x\u00e1m b\u1ea1c m\u00e0u tr\u00ean ph\u00f9 sa c\u1ed5 hay \u0111\u1ea5t x\u00e1m feralit (Ferralitc Acrisols -Acf) \u0111\u01b0\u1ee3c qui ho\u1ea1ch \u0111\u1ec3 tr\u1ed3ng r\u1eebng c\u00f3 di\u1ec7n t\u00edch l\u1edbn h\u01a1n c\u00e1c lo\u1ea1i \u0111\u1ea5t \u0111\u1ecf.<\/p>\n

               <\/p>\n

              K\u1ebft qu\u1ea3 ph\u00e2n t\u00edch ph\u1eabu di\u1ec7n \u0111\u1ea5t \u0111\u1eb7c tr\u01b0ng c\u1ee7a hai lo\u1ea1i \u0111\u1ea5t tr\u1ed3ng r\u1eebng keo lai t\u1ea1i L\u00e2m tr\u01b0\u1eddng Xuy\u00ean M\u1ed9c th\u00e1ng 6\/2003, \u0111\u01b0\u1ee3c tr\u00ecnh b\u00e0y trong b\u1ea3ng 3.<\/p>\n

               <\/p>\n

              B\u1ea3ng 3. \u0110\u1eb7c tr\u01b0ng \u0111\u1ea5t x\u00e1m b\u1ea1c m\u00e0u v\u00e0 \u0111\u1ea5t n\u00e2u \u0111\u1ecf (*)<\/i><\/p>\n

               <\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
              \n

              \n

              TT<\/b><\/b><\/p>\n

              m\u1eabu<\/b><\/b><\/p>\n

              \n<\/td>\n

              		\n

              \n

              \u0110\u1ed9 s\u00e2u<\/b><\/b><\/p>\n

              (cm)<\/b><\/b><\/p>\n

              \n<\/td>\n

              		\n

              CH\u1ec8 TI\u00caU PH\u00c2N T\u00cdCH<\/b><\/b><\/p>\n<\/td>\n<\/tr>\n

              \n

              pH<\/b><\/b><\/p>\n

              KCl<\/b><\/b><\/p>\n<\/td>\n

              		\n

              pH<\/b><\/b><\/p>\n

              H2<\/sub>O<\/b><\/b><\/p>\n<\/td>\n

              		\n

              T\u1ed3ng s\u1ed1<\/i><\/b><\/i><\/b><\/p>\n<\/td>\n

              		\n

              Trao \u0111\u1ed5i<\/i><\/b><\/i><\/b><\/p>\n<\/td>\n

              		\nT.ph\u1ea7n c. gi\u1edbi (mm; % <\/b><\/b><\/td>\n<\/tr>\n
              \n

              C. h\u1eefu<\/b><\/b><\/p>\n

              c\u01a1 %<\/b><\/b><\/p>\n<\/td>\n

              		\n

              N<\/b><\/b><\/p>\n

              %<\/b><\/b><\/p>\n<\/td>\n

              		\n

              P2<\/sub>O5<\/sub><\/b><\/b><\/p>\n

              %<\/b><\/b><\/p>\n<\/td>\n

              		\n

              K2<\/sub>O<\/b><\/b><\/p>\n

              %<\/b><\/b><\/p>\n<\/td>\n

              		\n

              Ca++<\/sup><\/b><\/b><\/p>\n

              me\/100<\/b><\/b><\/p>\n<\/td>\n

              		\n

              Mg++<\/sup><\/b><\/b><\/p>\n

              me\/100<\/b><\/b><\/p>\n<\/td>\n

              		\n

              Al+++<\/sup><\/b><\/b><\/p>\n

              me\/100<\/b><\/b><\/p>\n<\/td>\n

              		\n

              H +<\/sup><\/b><\/b><\/p>\n

              me\/100<\/b><\/b><\/p>\n<\/td>\n

              		\n

              2 –<\/b><\/b><\/p>\n

              0.02<\/b><\/b><\/p>\n<\/td>\n

              		\n

              0.02-<\/b><\/b><\/p>\n

              0.002<\/b><\/b><\/p>\n<\/td>\n

              		\n

              <<\/b><\/b><\/p>\n<\/td>\n<\/tr>\n

              \n

              0.002<\/b><\/b><\/p>\n<\/td>\n<\/tr>\n

              \n

              \u0110\u1ea5t<\/b><\/b><\/p>\n<\/td>\n

              		\nn\u00e2u<\/b><\/td>\n\n

              \u0111\u1ecf<\/b><\/p>\n<\/td>\n

              		\n

              \n<\/td>\n

              		\n <\/td>\n\n <\/td>\n\n <\/td>\n\n <\/td>\n\n <\/td>\n\n <\/td>\n\n <\/td>\n\n <\/td>\n\n <\/td>\n\n <\/td>\n\n <\/td>\n<\/tr>\n
              \n

              20<\/p>\n<\/td>\n

              		\n

              0-15<\/p>\n<\/td>\n

              		\n

              4.51<\/p>\n<\/td>\n

              		\n

              5.38<\/p>\n<\/td>\n

              		\n

              3.344<\/p>\n<\/td>\n

              		\n

              0.217<\/p>\n<\/td>\n

              		\n

              0.131<\/p>\n<\/td>\n

              		\n

              0.03<\/p>\n<\/td>\n

              		\n

              2.5<\/p>\n<\/td>\n

              		\n

              1.80<\/p>\n<\/td>\n

              		\n

              0.06<\/p>\n<\/td>\n

              		\n

              0.05<\/p>\n<\/td>\n

              		\n

              22.1<\/p>\n<\/td>\n

              		\n

              27.9<\/p>\n<\/td>\n

              		\n

              50.0<\/p>\n<\/td>\n<\/tr>\n

              \n

              21<\/p>\n<\/td>\n

              		\n

              15-50<\/p>\n<\/td>\n

              		\n

              4.45<\/p>\n<\/td>\n

              		\n

              5.10<\/p>\n<\/td>\n

              		\n

              1.045<\/p>\n<\/td>\n

              		\n

              0.105<\/p>\n<\/td>\n

              		\n

              0.100<\/p>\n<\/td>\n

              		\n

              0.01<\/p>\n<\/td>\n

              		\n

              0.4<\/p>\n<\/td>\n

              		\n

              1.10<\/p>\n<\/td>\n

              		\n

              0.13<\/p>\n<\/td>\n

              		\n

              0.05<\/p>\n<\/td>\n

              		\n

              13.0<\/p>\n<\/td>\n

              		\n

              31.0<\/p>\n<\/td>\n

              		\n

              56.0<\/p>\n<\/td>\n<\/tr>\n

              \n

              22<\/p>\n<\/td>\n

              		\n

              50-100<\/p>\n<\/td>\n

              		\n

              4.39<\/p>\n<\/td>\n

              		\n

              5.32<\/p>\n<\/td>\n

              		\n

              0.941<\/p>\n<\/td>\n

              		\n

              0.077<\/p>\n<\/td>\n

              		\n

              0.097<\/p>\n<\/td>\n

              		\n

              0.01<\/p>\n<\/td>\n

              		\n

              0.6<\/p>\n<\/td>\n

              		\n

              0.10<\/p>\n<\/td>\n

              		\n

              0.22<\/p>\n<\/td>\n

              		\n

              0.02<\/p>\n<\/td>\n

              		\n

              16.5<\/p>\n<\/td>\n

              		\n

              29.5<\/p>\n<\/td>\n

              		\n

              54.0<\/p>\n<\/td>\n<\/tr>\n

              \n

              \u0110\u1ea5t<\/b><\/b><\/p>\n<\/td>\n

              		\n

              x\u00e1m<\/b><\/p>\n<\/td>\n

              		\n

              b\u1ea1c<\/b><\/p>\n<\/td>\n

              		\n

              m\u00e0u<\/b><\/p>\n<\/td>\n

              		\n <\/td>\n\n <\/td>\n\n <\/td>\n\n <\/td>\n\n <\/td>\n\n <\/td>\n\n <\/td>\n\n <\/td>\n\n <\/td>\n\n <\/td>\n\n <\/td>\n<\/tr>\n
              \n

              26<\/p>\n<\/td>\n

              		\n

              0-15<\/p>\n<\/td>\n

              		\n

              4.12<\/p>\n<\/td>\n

              		\n

              5.38<\/p>\n<\/td>\n

              		\n

              1.777<\/p>\n<\/td>\n

              		\n

              0.133<\/p>\n<\/td>\n

              		\n

              0.032<\/p>\n<\/td>\n

              		\n

              0.05<\/p>\n<\/td>\n

              		\n

              1.0<\/p>\n<\/td>\n

              		\n

              0.60<\/p>\n<\/td>\n

              		\n

              0.30<\/p>\n<\/td>\n

              		\n

              0.05<\/p>\n<\/td>\n

              		\n

              48.3<\/p>\n<\/td>\n

              		\n

              15.7<\/p>\n<\/td>\n

              		\n

              36.0<\/p>\n<\/td>\n<\/tr>\n

              \n

              27<\/p>\n<\/td>\n

              		\n

              15-50<\/p>\n<\/td>\n

              		\n

              4.09<\/p>\n<\/td>\n

              		\n

              5.00<\/p>\n<\/td>\n

              		\n

              0.626<\/p>\n<\/td>\n

              		\n

              0.063<\/p>\n<\/td>\n

              		\n

              0.027<\/p>\n<\/td>\n

              		\n

              0.05<\/p>\n<\/td>\n

              		\n

              0.5<\/p>\n<\/td>\n

              		\n

              0.10<\/p>\n<\/td>\n

              		\n

              0.48<\/p>\n<\/td>\n

              		\n

              0.05<\/p>\n<\/td>\n

              		\n

              43.2<\/p>\n<\/td>\n

              		\n

              24.8<\/p>\n<\/td>\n

              		\n

              32.0<\/p>\n<\/td>\n<\/tr>\n

              \n

              28<\/p>\n<\/td>\n

              		\n

              50-80<\/p>\n<\/td>\n

              		\n

              4.16<\/p>\n<\/td>\n

              		\n

              5.12<\/p>\n<\/td>\n

              		\n

              0.452<\/p>\n<\/td>\n

              		\n

              0.056<\/p>\n<\/td>\n

              		\n

              0.024<\/p>\n<\/td>\n

              		\n

              0.05<\/p>\n<\/td>\n

              		\n

              0.2<\/p>\n<\/td>\n

              		\n

              0.25<\/p>\n<\/td>\n

              		\n

              0.68<\/p>\n<\/td>\n

              		\n

              0.05<\/p>\n<\/td>\n

              		\n

              45.5<\/p>\n<\/td>\n

              		\n

              18.5<\/p>\n<\/td>\n

              		\n

              36.0<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

              (*) Ph\u00e2n t\u00edch t\u1ea1i Ph\u00e2n vi\u1ec7n Khoa h\u1ecdc L\u00e2m nghi\u1ec7p<\/i><\/p>\n

               <\/p>\n

              B\u1ea3ng n\u00e0y cho th\u1ea5y c\u1ea3 hai lo\u1ea1i \u0111\u1ea5t \u0111\u1ec1u kh\u00e1 chua pH (H2<\/sub>0) < 5.38.<\/p>\n

              – \u0110\u1ea5t \u0111\u1ecf kh\u00e1 gi\u00e0u ch\u1ea5t h\u1eefu c\u01a1 \u1edf t\u1ea7ng tr\u00ean, trung b\u00ecnh \u1edf hai t\u1ea7ng k\u1ebf ti\u1ebfp. Trong khi tr\u00ean \u0111\u1ea5t x\u00e1m ch\u1ea5t h\u1eedu c\u01a1 trung b\u00ecnh \u1edf t\u1ea7ng tr\u00ean v\u00e0 r\u1ea5t ngh\u00e8o \u1edf c\u00e1c t\u1ea7ng ti\u1ebfp theo.<\/p>\n

              – \u0110\u1ea5t \u0111\u1ecf c\u00f3 h\u00e0m l\u01b0\u1ee3ng \u0111\u1ea1m t\u1ed5ng s\u1ed1 cao, >0,2% \u1edf t\u1ea7ng tr\u00ean v\u00e0 trung b\u00ecnh \u1edf t\u1ea7ng k\u1ebf ti\u1ebfp, nh\u01b0ng \u1edf \u0111\u1ea5t x\u00e1m \u0111\u1ea1m t\u1ed5ng s\u1ed1 ch\u1ec9 t\u1eeb trung b\u00ecnh \u0111\u1ebfn ngh\u00e8o.<\/p>\n

              – L\u00e2n t\u1ed5ng s\u1ed1 tr\u00ean \u0111\u1ea5t \u0111\u1ecf cao h\u01a1n r\u1ea5t nhi\u1ec1u so v\u1edbi \u0111\u1ea5t x\u00e1m \u1edf t\u1ea5t c\u1ea3 c\u00e1c t\u1ea7ng \u0111\u1ea5t.<\/p>\n

              – Kh\u1ea3 n\u0103ng trao \u0111\u1ed5i c\u00e1c cation c\u1ee7a \u0111\u1ea5t \u0111\u1ecf c\u0169ng kh\u00e1 h\u01a1n so v\u1edbi \u0111\u1ea5t x\u00e1m b\u1ea1c m\u00e0u.<\/p>\n

              K\u1ebft qu\u1ea3 sinh tr\u01b0\u1edfng r\u1eebng keo lai tr\u00ean hai lo\u1ea1i \u0111\u1ea5t \u0111\u01b0\u1ee3c tr\u00ecnh b\u00e0y trong b\u1ea3ng 4 cho th\u1ea5y m\u1eb7c d\u00f9 s\u1ed1 c\u00e2y tr\u1ed3ng tr\u00ean \/ha \u00edt h\u01a1n nh\u01b0ng tr\u00ean \u0111\u1ea5t \u0111\u1ecf sinh tr\u01b0\u1edfng c\u1ee7a keo lai v\u1eabn cho tr\u1eef l\u01b0\u1ee3ng (m3<\/sup>\/ha) l\u1edbn h\u01a1n tr\u00ean \u0111\u1ea5t x\u00e1m b\u1ea1c m\u00e0u. C\u00e1c ch\u1ec9 s\u1ed1 sinh tr\u01b0\u1edfng v\u1ec1 \u0111\u01b0\u1eddng k\u00ednh v\u00e0 chi\u1ec1u cao c\u1ee7a r\u1eebng tr\u1ed3ng tr\u00ean \u0111\u1ea5t \u0111\u1ecf \u0111\u1ec1u cao h\u01a1n tr\u1ed3ng tr\u00ean \u0111\u1ea5t x\u00e1m 40% v\u00e0 30% t\u01b0\u01a1ng \u1ee9ng.<\/p>\n

               <\/p>\n

              B\u1ea3ng 4. Sinh tr\u01b0\u1edfng keo lai tr\u00ean hai d\u1ea1ng l\u1eadp \u0111\u1ecba t\u1ea1i L\u00e2m tr\u01b0\u1eddng Xuy\u00ean M\u1ed9c<\/i><\/p>\n

               <\/p>\n\n\n\n\n\n\n\n\n\n
              \n

              Lo\u1ea1i<\/b><\/b><\/p>\n

              \u0111\u1ea5t<\/b><\/b><\/p>\n<\/td>\n

              		\n

              S\u1ed1 \u00f4<\/b><\/b><\/p>\n

              \n<\/td>\n

              		\n

              M\u1eadt \u0111\u1ed9<\/b><\/b><\/p>\n

              c\u00e2y\/ha<\/b><\/b><\/p>\n<\/td>\n

              		\n

              C\u1ef1 li<\/b><\/b><\/p>\n

              tr\u1ed3ng, m<\/b><\/b><\/p>\n<\/td>\n

              		\n

              TLS<\/b><\/b><\/p>\n

              %<\/b><\/b><\/p>\n<\/td>\n

              		\n
              T\u1ef7 l\u1ec7 th\u00e2n<\/span><\/h6>\n<\/td>\n
              		\n
              D,cm<\/span><\/h6>\n

              \n<\/td>\n

              		\n

              H,m<\/b><\/b><\/p>\n

              \n<\/td>\n

              		\n

              M,ha<\/b><\/b><\/p>\n

              m3<\/sup><\/b><\/b><\/p>\n<\/td>\n

              		\n

              T\u0103ng tr\u01b0\u1edfng<\/b><\/p>\n

              m3<\/sup>\/ha\/n\u0103m<\/b><\/p>\n<\/td>\n<\/tr>\n

              \n

              1 th\u00e2n %<\/b><\/b><\/p>\n<\/td>\n

              		\n

              2 th\u00e2n %<\/b><\/b><\/p>\n<\/td>\n

              		\n

              3 th\u00e2n %<\/b><\/b><\/p>\n<\/td>\n<\/tr>\n

              \n

              \u0110\u1ea5t <\/b><\/b><\/p>\n<\/td>\n

              		\n

              x\u00e1m<\/b><\/b><\/p>\n<\/td>\n

              		\n

              b\u1ea1c<\/b><\/b><\/p>\n<\/td>\n

              		\n

              m\u00e0u<\/b><\/b><\/p>\n<\/td>\n

              		\n

              \n<\/td>\n

              		\n

              \n<\/td>\n

              		\n

              \n<\/td>\n

              		\n

              \n<\/td>\n

              		\n

              \n<\/td>\n

              		\n

              \n<\/td>\n

              		\n

              \n<\/td>\n

              		\n

              \n<\/td>\n<\/tr>\n

              \n

              \n<\/td>\n

              		\n

              8<\/p>\n<\/td>\n

              		\n

              3333<\/p>\n<\/td>\n

              		\n

              3 x 1<\/p>\n<\/td>\n

              		\n

              92.5<\/p>\n<\/td>\n

              		\n

              91.9<\/p>\n<\/td>\n

              		\n

              8.1<\/p>\n<\/td>\n

              		\n

              \n<\/td>\n

              		\n

              2.42<\/p>\n<\/td>\n

              		\n

              2.95<\/p>\n<\/td>\n

              		\n

              4.160<\/p>\n<\/td>\n

              		\n

              4.166<\/p>\n<\/td>\n<\/tr>\n

              \n

              \u0110\u1ea5t<\/b><\/b><\/p>\n<\/td>\n

              		\n

              n\u00e2u <\/b><\/b><\/p>\n<\/td>\n

              		\n

              \u0111\u1ecf<\/b><\/b><\/p>\n<\/td>\n

              		\n

              \n<\/td>\n

              		\n

              \n<\/td>\n

              		\n

              \n<\/td>\n

              		\n

              \n<\/td>\n

              		\n

              \n<\/td>\n

              		\n

              \n<\/td>\n

              		\n

              \n<\/td>\n

              		\n

              \n<\/td>\n

              		\n

              \n<\/td>\n<\/tr>\n

              \n

              \n<\/td>\n

              		\n

              1<\/p>\n<\/td>\n

              		\n

              2222<\/p>\n<\/td>\n

              		\n

              3 x 1,5<\/p>\n<\/td>\n

              		\n

              92.5<\/p>\n<\/td>\n

              		\n

              67.5<\/p>\n<\/td>\n

              		\n

              23.4<\/p>\n<\/td>\n

              		\n

              \n<\/td>\n

              		\n

              3.55<\/p>\n<\/td>\n

              		\n

              3.87<\/p>\n<\/td>\n

              		\n

              7.500<\/p>\n<\/td>\n

              		\n

              7.500<\/p>\n<\/td>\n<\/tr>\n

              \n

              \n<\/td>\n

              		\n

              2<\/p>\n<\/td>\n

              		\n

              2222<\/p>\n<\/td>\n

              		\n

              3 x 1,5<\/p>\n<\/td>\n

              		\n

              87.5<\/p>\n<\/td>\n

              		\n

              71.4<\/p>\n<\/td>\n

              		\n

              22.8<\/p>\n<\/td>\n

              		\n

              5.7<\/p>\n<\/td>\n

              		\n

              3.48<\/p>\n<\/td>\n

              		\n

              3.82<\/p>\n<\/td>\n

              		\n

              6.944<\/p>\n<\/td>\n

              		\n

              6.944<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

               <\/p>\n

              Nh\u1eadn x\u00e9t<\/span><\/i><\/h1>\n

               <\/p>\n

              \u0110\u1ed9 ph\u00ec nhi\u00eau c\u1ee7a hai lo\u1ea1i \u0111\u1ea5t tr\u1ed3ng r\u1eebng ph\u1ed5 bi\u1ebfn \u1edf v\u00f9ng \u0110\u00f4ng Nam B\u1ed9 r\u1ea5t kh\u00e1c nhau, theo \u0111\u00f3 \u0111\u1ea5t n\u00e2u \u0111\u1ecf c\u00f3 c\u00e1c ch\u1ec9 s\u1ed1 v\u1ec1 \u0111\u1ed9 ph\u00ec \u0111\u1ea5t t\u1ed1t h\u01a1n lo\u1ea1i \u0111\u1ea5t x\u00e1m b\u1ea1c m\u00e0u tr\u00ean ph\u00f9 sa c\u1ed5. Sinh tr\u01b0\u1edfng r\u1eebng ngay sau n\u0103m \u0111\u1ea7u m\u1edbi tr\u1ed3ng \u0111\u00e3 cho th\u1ea5y keo lai sinh tr\u01b0\u1edfng t\u1ed1t h\u01a1n tr\u00ean \u0111\u1ea5t n\u00e2u \u0111\u1ecf so v\u1edbi tr\u00ean \u0111\u1ea5t x\u00e1m b\u1ea1c m\u00e0u.<\/p>\n

               <\/p>\n

              V. K\u1ebft lu\u1eadn<\/span><\/h1>\n

               <\/p>\n

              C\u00e2y keo lai v\u1edbi ti\u1ec1m n\u0103ng sinh tr\u01b0\u1edfng nhanh \u0111\u00e3 \u0111\u01b0\u1ee3c c\u00e1c c\u01a1 s\u1edf tr\u1ed3ng r\u1eebng ph\u00eda Nam s\u1eed d\u1ee5ng l\u00e0m c\u00e2y tr\u1ed3ng ch\u00ednh v\u1edbi m\u1ee5c ti\u00eau l\u00e0m nguy\u00ean li\u1ec7u gi\u1ea5y.<\/p>\n

              Nh\u1ecbp \u0111\u1ed9 sinh tr\u01b0\u1edfng c\u1ee7a r\u1eebng cho th\u1ea5y t\u1eeb n\u0103m th\u1ee9 3 sinh tr\u01b0\u1edfng chi\u1ec1u cao v\u00e0 \u0111\u01b0\u1eddng k\u00ednh th\u00e2n c\u00e2y v\u1eabn ti\u1ebfp t\u1ee5c t\u0103ng nh\u01b0ng m\u1ee9c \u0111\u1ed9 sinh tr\u01b0\u1edfng \u0111\u00e3 ch\u1eadm l\u1ea1i.<\/p>\n

              N\u0103ng su\u1ea5t r\u1eebng sau 2-3 n\u0103m tr\u1ed3ng t\u1ea1i n\u01a1i tr\u1ed3ng m\u1eadt \u0111\u1ed9 d\u00e0y cao h\u01a1n n\u01a1i tr\u1ed3ng m\u1eadt \u0111\u1ed9 th\u01b0a, tuy nhi\u00ean do nh\u1ecbp \u0111\u1ed9 sinh tr\u01b0\u1edfng r\u1eebng \u0111\u00e3 ch\u1eadm l\u1ea1i t\u1eeb n\u0103m th\u1ee9 4, do v\u1eady ch\u1ec9 n\u00ean tr\u1ed3ng r\u1eebng trong kho\u1ea3ng m\u1eadt \u0111\u1ed9 t\u1eeb 1111 c\u00e2y \u2013 1666 c\u00e2y s\u1ebd ph\u00f9 h\u1ee3p h\u01a1n.<\/p>\n

              Trong \u0111i\u1ec1u ki\u1ec7n tr\u1ed3ng r\u1eebng tr\u00ean \u0111\u1ea5t x\u00e1m b\u1ea1c m\u00e0u, c\u1ea7n ph\u1ea3i c\u00f3 k\u1ef9 thu\u1eadt b\u00f3n ph\u00e2n nh\u1eb1m b\u1ed5 sung dinh d\u01b0\u1ee1ng cho c\u00e2y b\u1edfi \u0111\u1ed9 ph\u00ec c\u1ee7a lo\u1ea1i \u0111\u1ea5t n\u00e0y r\u1ea5t k\u00e9m.<\/p>\n

              Bi\u1ec7n ph\u00e1p ph\u00f2ng ch\u1ed1ng ch\u00e1y b\u1eb1ng c\u00e1ch \u201c\u0111\u1ed1t tr\u01b0\u1edbc\u201d d\u01b0\u1edbi t\u00e1n r\u1eebng keo m\u00e0 c\u00e1c c\u01a1 s\u1edf tr\u1ed3ng r\u1eebng \u0111ang \u00e1p d\u1ee5ng kh\u00e1 ph\u1ed5 bi\u1ebfn hi\u1ec7n nay, s\u1ebd c\u00f3 nguy c\u01a1 l\u00e0m cho \u0111\u1ea5t suy gi\u1ea3m \u0111\u1ed9 ph\u00ec nhi\u00eau v\u00e0 d\u1eabn \u0111\u1ebfn kh\u1ea3 n\u0103ng gi\u1ea3m n\u0103ng su\u1ea5t r\u1eebng trong c\u00e1c lu\u00e2n k\u1ef3 k\u1ebf ti\u1ebfp.<\/p>\n

               <\/p>\n

              T\u00e0i li\u1ec7u tham kh\u1ea3o<\/b><\/p>\n

                \n
                  \n
                    \n
                  1. H\u1ed9i Khoa h\u1ecdc \u0111\u1ea5t Vi\u1ec7t Nam., 2000. \u0110\u1ea5t Vi\u1ec7t Nam. Nh\u00e0 xu\u1ea5t b\u1ea3n N\u00f4ng nghi\u1ec7p, H\u00e0 N\u1ed9i, trang 179-197.<\/li>\n<\/ol>\n<\/ol>\n<\/ol>\n

                     <\/p>\n

                      \n
                        \n
                          \n
                        1. \u0110\u1eb7ng Ph\u01b0\u1edbc \u0110\u1ea1i, 2003. \u1ea2nh h\u01b0\u1edfng c\u1ee7a xu\u1ea5t x\u1ee9 h\u1ea1t gi\u1ed1ng v\u00e0 k\u1ef9 thu\u1eadt th\u00e2m canh \u0111\u1ebfn sinh tr\u01b0\u1edfng r\u1eebng tr\u1ed3ng th\u00ed nghi\u1ec7m keo tai t\u01b0\u1ee3ng (A.mangium<\/i> Will) v\u00e0 keo l\u00e1 tr\u00e0m (A. auriculifrmis <\/i>A.cunn.ex.Benth). <\/i>Lu\u1eadn v\u0103n th\u1ea1c s\u0129 khoa h\u1ecdc n\u00f4ng nghi\u1ec7p, Tp H\u1ed3 Ch\u00ed Minh.<\/li>\n<\/ol>\n<\/ol>\n<\/ol>\n

                           <\/p>\n

                          Summary<\/b><\/p>\n

                          The survey on productivity of Acacia hybrid plantation in three forest production units in Eastern South Vietnam i.e Xuyen Moc forest enterprise (Ba Ria- Vung Tau), South Vietnam paper raw material company (Binh Phuoc) accomplished in May 2003 show that productivity of Acacia hybrid plantations varies greatly depending on planting site and planting density: on reddish soil, growth is better than on infertile greyish soil, planting density to be used is about 1111 trees\/ha. Acacia hybrid grows fast in the first three years and shows down there after. Herbicide spraying is advised to be used and the technique must be further studied in detail. The measure of \u201cadvanced burning\u201d of the ground vegetation under the canopy of acacia plantation for fire control will reduce soil fertility and will be full of risk. Research is needed for more sustainable management.<\/p>\n

                          \n

                          *<\/a>Ph\u00e2n vi\u1ec7n khoa h\u1ecdc l\u00e2m nghi\u1ec7p Nam B\u1ed9<\/i><\/p>\n","protected":false},"excerpt":{"rendered":"

                          \u0110\u00f4ng Nam B\u1ed9, v\u00f9ng kinh t\u1ebf tr\u1ecdng \u0111i\u1ec3m c\u1ee7a ph\u00eda Nam c\u00f3 ba t\u1ed5 ch\u1ee9c tr\u1ed3ng r\u1eebng cung c\u1ea5p nguy\u00ean li\u1ec7u gi\u1ea5y v\u1edbi qui m\u00f4 kh\u00e1 l\u1edbn \u0111\u00f3 l\u00e0: C\u00f4ng ty nguy\u00ean li\u1ec7u gi\u1ea5y mi\u1ec1n Nam (t\u1ec9nh \u0110\u1ed3ng Nai), L\u00e2m tr\u01b0\u1eddng Xuy\u00ean M\u1ed9c (t\u1ec9nh B\u00e0 R\u1ecba-V\u0169ng t\u1ea7u) v\u00e0 C\u00f4ng ty C\u1ed5 ph\u1ea7n H\u1ea3i V\u01b0\u01a1ng ( t\u1ec9nh B\u00ecnh Long). <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[21],"tags":[],"_links":{"self":[{"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/473"}],"collection":[{"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/comments?post=473"}],"version-history":[{"count":3,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/473\/revisions"}],"predecessor-version":[{"id":11543,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/473\/revisions\/11543"}],"wp:attachment":[{"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/media?parent=473"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/categories?post=473"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/tags?post=473"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}