{"id":8627,"date":"2009-03-24T02:34:16","date_gmt":"2009-03-23T19:34:16","guid":{"rendered":"http:\/\/vafs.gov.vn\/vn\/2009\/03\/tiem-nang-su-dung-go-keo-lai-va-nhung-dieu-can-lu-y-trong-trong-rung\/"},"modified":"2019-10-01T10:44:29","modified_gmt":"2019-10-01T03:44:29","slug":"tiem-nang-su-dung-go-keo-lai-va-nhung-dieu-can-lu-y-trong-trong-rung","status":"publish","type":"post","link":"https:\/\/vafs.gov.vn\/vn\/tiem-nang-su-dung-go-keo-lai-va-nhung-dieu-can-lu-y-trong-trong-rung\/","title":{"rendered":"Ti\u1ec1m n\u0103ng s\u1eed d\u1ee5ng g\u1ed7 Keo lai v\u00e0 nh\u1eefng \u0111i\u1ec1u c\u1ea7n l\u01b0u \u00fd trong tr\u1ed3ng r\u1eebng"},"content":{"rendered":"

Ph\u1ea1m Th\u1ebf D\u0169ng<\/em><\/strong><\/p>\n

Ph\u00e2n vi\u1ec7n Khoa hoa L\u00e2m nghi\u1ec7p Nam b\u1ed9<\/em><\/p>\n

Vi\u1ec7n Khoa h\u1ecdc L\u00e2m nghi\u1ec7p Vi\u1ec7t Nam<\/em><\/p>\n

1. Gi\u1edbi thi\u1ec7u v\u1ec1 Keo lai <\/strong><\/p>\n

S\u1ef1 xu\u1ea5t hi\u1ec7n l\u1ea7n \u0111\u1ea7u ti\u00ean c\u1ee7a Keo lai (A.Hybrid<\/em>) gi\u1eefa 2 lo\u00e0i A.mangium<\/em> v\u00e0 A.auriculyformis<\/em> \u0111\u00ad\u1ee3c Messrs Hepburn v\u00e0 Shim ghi nh\u1eadn v\u00e0o n\u0103m 1972 t\u1ea1i c\u00e1c h\u00e0ng c\u00e2y b\u00ean \u0111\u00ad\u1eddng \u1edf Sook, \u00fac; Sau \u0111\u00f3 v\u00e0o th\u00e1ng 7 n\u0103m 1978, Pedley (ng\u00ad\u1eddi \u00fac) kh\u1eb3ng \u0111\u1ecbnh \u0111\u00f3 ch\u00ednh l\u00e0 gi\u1ed1ng lai. C\u00e2y lai c\u1ee7a hai lo\u00e0i A.magum <\/em>Willd v\u00e0 A.auriculyformis <\/em>ex Cunn Benth c\u0169ng \u0111\u00ad\u1ee3c kh\u00e1m ph\u00e1 t\u1ea1i Sabah Malaysia v\u00e0o cu\u1ed1i n\u0103m 1970 ( FAO, 1982).<\/p>\n

\u1edfc\u00e1c t\u1ec9nh ph\u00eda Nam n\u00ad\u1edbc ta, Keo lai c\u0169ng xu\u1ea5t hi\u1ec7n kh\u00e1 nhi\u1ec1u t\u1ea1i m\u1ed9t s\u1ed1 v\u00f9ng tr\u1ed3ng r\u1eebng \u1edf T\u00e2n T\u1ea1o, B\u00ecnh Ch\u00e1nh TP.HCM, S\u00f4ng M\u00e2y, Tr\u1ecb An v\u00e0 Th\u1ed1ng Nh\u1ea5t t\u1ec9nh \u0110\u1ed3ng Nai. C\u00e1c c\u00e2y lai n\u00e0y \u0111\u00ad\u1ee3c ph\u00e1t hi\u1ec7n trong nh\u1eefng qu\u1ea7n th\u1ee5 r\u1eebng tr\u1ed3ng thu\u1ea7n lo\u1ea1i Keo l\u00e1 l\u1edbn ho\u1eb7c Keo l\u00e1 nh\u1ecf b\u1edfi c\u00e1c \u0111\u1eb7c tr\u00adng h\u00ecnh th\u00e1i r\u1ea5t d\u1ec5 ph\u00e2n bi\u1ec7t :<\/p>\n

– Sinh tr\u00ad\u1edfng chi\u1ec1u cao v\u00e0 \u0111\u00ad\u1eddng k\u00ednh v\u00ad\u1ee3t tr\u1ed9i h\u01a1n qu\u1ea7n th\u1ee5.<\/p>\n

– H\u00ecnh th\u00e1i l\u00e1 c\u00f3 d\u1ea1ng trung gian gi\u1eefa Keo l\u00e1 l\u1edbn v\u00e0 l\u00e1 nh\u1ecf khi so s\u00e1nh t\u00ad\u01a1ng quan gi\u1eefa chi\u1ec1u d\u00e0i v\u00e0 chi\u1ec1u r\u1ed9ng c\u1ee7a l\u00e1. Tuy nhi\u00ean, h\u00ecnh th\u00e1i l\u00e1 g\u1ea7n gi\u1ed1ng Keo l\u00e1 l\u1edbn.<\/p>\n

– V\u1ecf th\u00e2n c\u00e2y Keo lai l\u1ea1i tr\u01a1n, nh\u1eb5n v\u00e0 m\u00e0u s\u00e1ng \u00edt n\u1ee9t v\u1ecf v\u00e0 g\u1ea7n gi\u1ed1ng v\u1ecf th\u00e2n c\u00e2y Keo l\u00e1 nh\u1ecf.<\/p>\n

2. \u0110\u1eb7c \u0111i\u1ec3m sinh tr\u00ad\u1edfng c\u1ee7a Keo lai<\/strong><\/p>\n

K\u1ebft qu\u1ea3 \u0111i\u1ec1u tra sinh tr\u00ad\u1edfng Keo lai t\u1ef1 nhi\u00ean trong c\u00e1c qu\u1ea7n th\u1ee5 r\u1eebng \u1edf t\u1ec9nh \u0110\u1ed3ng Nai,TP.HCM \u0111\u1ec1u kh\u1eb3ng \u0111\u1ecbnh \u00adu th\u1ebf lai \u0111\u1eddi F1 \u0111\u00ad\u1ee3c th\u1ec3 hi\u1ec7n r\u1ea5t r\u00f5 r\u1ec7t qua sinh tr\u00ad\u1edfng v\u00ad\u1ee3t tr\u1ed9i v\u1ec1 chi\u1ec1u cao, \u0111\u00ad\u1eddng k\u00ednh th\u00e2n c\u00e2y v\u00e0 h\u00ecnh d\u1ea1ng t\u1ed1t c\u1ee7a th\u00e2n. V\u1ec1 sinh tr\u00ad\u1edfng v\u00ad\u1ee3t tr\u1ed9i c\u1ee7a Keo lai, \u0111\u00e3 c\u00f3 nhi\u1ec1u t\u00e1c gi\u1ea3 th\u00f4ng b\u00e1o n\u00ean ch\u00fang t\u00f4i kh\u00f4ng \u0111\u1ec1 c\u1eadp trong b\u00e0i vi\u1ebft n\u00e0y m\u00e0 mu\u1ed1n xem x\u00e9t \u1edf kh\u00eda c\u1ea1nh ch\u1ea5t l\u00ad\u1ee3ng g\u1ed7, ti\u1ec1m n\u0103ng s\u1eed d\u1ee5ng ch\u00fang, nhu c\u1ea7u th\u1ecb tr\u00ad\u1eddng nh\u1eb1m khuy\u1ebfn c\u00e1o ng\u00ad\u1eddi tr\u1ed3ng r\u1eebng v\u1ec1 lo\u1ea1i c\u00e2y n\u00e0y .<\/p>\n

3.Ti\u1ec1m n\u0103ng l\u00e0m b\u1ed9t gi\u1ea5y c\u1ee7a Keo lai.<\/strong><\/p>\n

R\u1eebng tr\u1ed3ng \u1edf v\u00f9ng \u0110\u00f4ng Nam B\u1ed9 v\u1edbi c\u00e1c lo\u00e0i c\u00e2y m\u1ecdc nhanh ch\u1ee7 y\u1ebfu nh\u00ad Keo l\u00e1 l\u1edbn, Keo l\u00e1 tr\u00e0m, B\u1ea1ch \u0111\u00e0n trong nhi\u1ec1u n\u0103m qua ch\u1ee7 y\u1ebfu cung c\u1ea5p g\u1ed7 l\u00e0m nguy\u00ean li\u1ec7u gi\u1ea5y trong n\u00ad\u1edbc v\u00e0 xu\u1ea5t kh\u1ea9u d\u0103m. Khi tr\u1ed3ng \u0111\u1ea1i tr\u00e0 c\u00e2y Keo lai, m\u1ee5c \u0111\u00edch ban \u0111\u1ea7u l\u00e0 cung c\u1ea5p g\u1ed7 l\u00e0m b\u1ed9t gi\u1ea5y. \u0110\u1ec3 \u0111\u00e1p \u1ee9ng m\u1ee5c ti\u00eau n\u00e0y, c\u00e2y tr\u1ed3ng c\u1ea7n c\u00f3 c\u00e1c \u0111\u1eb7c tr\u00adng t\u1ed1t v\u1ec1 c\u00e1c ch\u1ec9 s\u1ed1 sau :<\/p>\n

– T\u1ef7 tr\u1ecdng g\u1ed7 cao hay kh\u1ed1i l\u00ad\u1ee3ng th\u1ec3 t\u00edch g\u1ed7 kh\u00f4 ki\u1ec7t cao.<\/p>\n

– T\u1ed5ng s\u1ed1 c\u00e1c ch\u1ea5t nh\u00ad Xenlulo, Lignin v\u00e0 Pentozan trong \u0111\u00f3 Xenlulo l\u00e0 th\u00e0nh ph\u1ea7n c\u01a1 b\u1ea3n ph\u1ea3i cao .<\/p>\n

– \u0110\u1ed9 b\u1ec1n c\u01a1 h\u1ecdc c\u1ee7a b\u1ed9t gi\u1ea5y ph\u1ea3i t\u1ed1t th\u00f4ng qua c\u00e1c ch\u1ec9 s\u1ed1: \u0111\u1ed9 ch\u1ecbu k\u00e9o (m); \u0111\u1ed9 ch\u1ecbu g\u1ea5p (\u0111\u00f4i l\u1ea7n); tro (%) v\u00e0 \u0111\u1ed9 t\u1ea9y tr\u1eafng (%).<\/p>\n

K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u cho th\u1ea5y<\/em>:<\/p>\n

– Kh\u1ed1i l\u00ad\u1ee3ng th\u1ec3 t\u00edch g\u1ed7 Keo lai l\u00e0 trung gian so v\u1edbi 2 lo\u00e0i c\u00e2y b\u1ed1, m\u1eb9. \u1edf tu\u1ed5i 7 Keo lai c\u00f3 kh\u1ed1i l\u00ad\u1ee3ng th\u1ec3 t\u00edch g\u1ed7 0.455 t\u1ea5n\/m3<\/sup> so v\u1edbi 0.414 t\u1ea5n\/m3<\/sup> c\u1ee7a Keo l\u00e1 l\u1edbn v\u00e0 0.469 c\u1ee7a Keo l\u00e1 nh\u1ecf (Vi\u1ec7n C\u00f4ng nghi\u1ec7p Gi\u1ea5y v\u00e0 Xenlulo, 3\/1995 ).<\/p>\n

– T\u1ed5ng s\u1ed1 c\u00e1c ch\u1ea5t l\u00e0m b\u1ed9t gi\u1ea5y (Xenlulo, Lignin, Pentozan ) trong Keo lai l\u00e0 95.2% so v\u1edbi 93.45 c\u1ee7a Keo l\u00e1 tr\u00e0m v\u00e0 94.2% trong Keo l\u00e1 l\u1edbn (Vi\u1ec7n C\u00f4ng nghi\u1ec7p Gi\u1ea5y v\u00e0 Xenlulo, 3\/1995 ) .<\/p>\n

– N\u0103ng su\u1ea5t l\u00e0m b\u1ed9t tr\u00ean m3<\/sup> g\u1ed7 c\u1ee7a Keo lai l\u00e0 232 kg\/m3<\/sup>, Keo l\u00e1 tr\u00e0m 233kg\/m3<\/sup> v\u00e0 Keo l\u00e1 l\u1edbn 195 kg\/m3<\/sup>. Kh\u1ed1i l\u00ad\u1ee3ng g\u1ed7 \u0111\u1eb7c tr\u00ean 1 t\u1ea5n b\u1ed9t l\u00e0 4.3m3<\/sup>, trong khi Keo l\u00e1 l\u1edbn 5.2m3<\/sup>\/1 t\u1ea5n b\u1ed9t v\u00e0 Keo l\u00e1 nh\u1ecf 4.48 m3<\/sup>\/1 t\u1ea5n b\u1ed9t.<\/p>\n

– V\u1ec1 \u0111\u1ed9 b\u1ec1n c\u01a1 h\u1ecdc c\u1ee7a b\u1ed9t gi\u1ea5y tr\u00ad\u1edbc v\u00e0 sau khi t\u1ea9y qua c\u00e1c ch\u1ec9 s\u1ed1 \u0111\u1ed9 ch\u1ecbu k\u00e9o, \u0111\u1ed9 g\u1ea5p, tro v\u00e0 \u0111\u1ed9 t\u1ea9y tr\u1eb1ng \u0111\u1ec1u cao h\u01a1n nhi\u1ec1u so v\u1edbi hai lo\u00e0i c\u00e2y b\u1ed1 m\u1eb9 ( L\u00ea \u0110\u00ecnh Kh\u1ea3 & c\u1ed9ng s\u1ef1 , 1997).<\/p>\n

4. Ti\u1ec1m n\u0103ng l\u00e0m v\u00e1n \u00e9p c\u1ee7a Keo lai <\/strong><\/p>\n

C\u00e1c m\u1eabu g\u1ed7 Keo lai ch\u1ecdn t\u1eeb Tr\u1ea1m Nghi\u00ean c\u1ee9u Th\u1ef1c nghi\u1ec7m L\u00e2m nghi\u1ec7p T\u00e2n T\u1ea1o TP.HCM \u0111\u00ad\u1ee3c g\u1eedi t\u1edbi Nagaya thu\u1ed9c C\u00f4ng ty C\u00f4ng nghi\u1ec7p Yuasa l\u00e0m g\u1ed7 v\u00e1n v\u00e0 ph\u00e2n t\u00edch t\u00ednh ch\u1ea5t c\u01a1 l\u00fd g\u1ed7 v\u00e1n t\u1ea1i tr\u00ad\u1eddng \u0110\u1ea1i h\u1ecdc T\u1ed5ng h\u1ee3p Kyushu (Nh\u1eadt B\u1ea3n). G\u1ed7 l\u00f3ng c\u00f3 \u0111\u1ed9 d\u00e0i 2.1-2.3m, \u0111\u00ad\u1eddng k\u00ednh t\u1eeb 18-40cm \u0111\u00ad\u1ee3c b\u00f3c l\u1edbp c\u00f3 \u0111\u1ed9 d\u00e0y 2.5mm, sau khi s\u1ea5y kh\u00f4 \u0111\u00ad\u1ee3c c\u1eaft kh\u1ed5 r\u1ed9ng 1m x 1m v\u00e0 d\u00e1n th\u00e0nh v\u00e1n c\u00f3 b\u1ec1 d\u00e0y 30mm v\u1edbi 13 l\u1edbp .<\/p>\n

Vi\u1ec7c ki\u1ec3m nghi\u1ec7m ch\u1ea5t l\u00ad\u1ee3ng v\u00e1n \u0111\u00ad\u1ee3c th\u1ef1c hi\u1ec7n b\u1edfi c\u00e1c th\u00f4ng s\u1ed1 theo ti\u00eau chu\u1ea9n N\u00f4ng nghi\u1ec7p Nh\u1eadt B\u1ea3n (JAS) \u0111\u1ed1i v\u1edbi v\u00e1n \u00e9p nh\u00ad sau :<\/p>\n

– \u0110\u1ed9 u\u1ed1n ( M\u00f4\u0111un g\u00e3y \u2013 Modulus of rupture \/ MOR).<\/p>\n

– \u0110\u1ed9 d\u1ebbo ( M\u00f4\u0111un \u0111\u00e0n h\u1ed3i \u2013 Modulus of elasticity \/ MOE ).<\/p>\n

– L\u1ef1c \u0111\u1ee9t g\u00e3y theo chi\u1ec1u ngang.<\/p>\n

– Tr\u1ecdng l\u00ad\u1ee3ng ri\u00eang.<\/p>\n

K\u1ebft qu\u1ea3: <\/em><\/p>\n

+ M\u00f4\u0111un g\u00e3y trung b\u00ecnh c\u1ee7a c\u00e1c m\u1eabu th\u00ed nghi\u1ec7m l\u00e0 626 kgf\/cm2<\/sup>, th\u1ea5p nh\u1ea5t l\u00e0 527kg f\/cm2<\/sup>; m\u00f4\u0111un \u0111\u00e0n h\u1ed3i trung b\u00ecnh c\u1ee7a c\u00e1c m\u1eabu th\u1eed l\u00e0 95.700 kgf\/cm2<\/sup>. Nh\u00ad v\u1eady \u0111\u1ed9 u\u1ed1n ho\u00e0n to\u00e0n tho\u1ea3 \u0111\u00e1ng cho c\u1ea5u tr\u00fac v\u00e1n v\u00e0 m\u1edf ra kh\u1ea3 n\u0103ng d\u00f9ng Keo lai nh\u00ad l\u00e0 m\u1ed9t v\u1eadt li\u1ec7u c\u1ea5u tr\u00fac .<\/p>\n

+ L\u1ef1c \u0111\u1ee9t g\u00e3y c\u1ee7a v\u00e1n \u0111\u1ea1t trung b\u00ecnh \u1edf m\u1ee9c 80 kgf\/cm2<\/sup>. N\u1ebfu so s\u00e1nh v\u1edbi ti\u00eau chu\u1ea9n JAS th\u00ec ch\u1ec9 s\u1ed1 n\u00e0y n\u1eb1m \u1edf h\u1ea1ng cao nh\u1ea5t .<\/p>\n

+ Tr\u1ecdng l\u00ad\u1ee3ng ri\u00eang c\u1ee7a c\u00e1c m\u1eabu th\u00ed nghi\u1ec7m n\u1eb1m \u1edf ph\u1ea1m vi t\u1eeb 0.566 \u0111\u1ebfn 0.599 v\u1edbi trung b\u00ecnh l\u00e0 0.585 . M\u1eb7c d\u00f9 c\u00f2n ph\u1ea3i th\u1eed nghi\u1ec7m th\u00eam do s\u1ed1 m\u1eabu c\u00f3 h\u1ea1n, song ch\u1ec9 s\u1ed1 n\u00e0y c\u0169ng cho th\u1ea5y Keo lai ho\u00e0n to\u00e0n \u0111\u00e1p \u1ee9ng \u0111\u00ad\u1ee3c y\u00eau c\u1ea7u cho c\u1ea5u tr\u00fac v\u1eadt li\u1ec7u .<\/p>\n

5. Ti\u1ec1m n\u0103ng s\u1eed d\u1ee5ng g\u1ed7 Keo lai l\u00e0m v\u00e1n d\u0103m <\/strong><\/p>\n

M\u1ed9t h\u00ad\u1edbng s\u1eed d\u1ee5ng kh\u00e1c c\u0169ng \u0111\u00e3 \u0111\u00ad\u1ee3c nghi\u00ean c\u1ee9u cho Keo lai l\u00e0 s\u1ea3n xu\u1ea5t th\u1eed v\u00e1n d\u0103m. G\u1ed7 Keo lai, bao g\u1ed3m c\u1ea3 g\u1ed7 gi\u00e1c v\u00e0 l\u00f5i \u0111\u00ad\u1ee3c b\u0103m th\u00e0nh d\u0103m c\u00f3 k\u00edch th\u00ad\u1edbc d\u00e0i 3.5cm, d\u00e0y 3mm v\u1edbi \u0111\u1ed9 \u1ea9m ban \u0111\u1ea7u 38%. D\u0103m th\u00f4 \u0111\u00ad\u1ee3c b\u0103m nh\u1ecf v\u00e0 s\u00e0ng l\u1ecdc \u1edf m\u1eaft l\u00ad\u1edbi 2mm d\u00f9ng cho c\u00e1c l\u1edbp ph\u00eda ngo\u00e0i. Tr\u1ecdng l\u00ad\u1ee3ng ri\u00eang c\u1ee7a l\u1edbp ngo\u00e0i kho\u1ea3ng 0.16g\/cm3<\/sup> v\u00e0 l\u1edbp gi\u1eefa 0.14 g\/ cm3<\/sup>. \u0110\u1ed9 ki\u1ec1m c\u1ee7a d\u0103m l\u00e0 5.8.<\/p>\n

V\u00e1n d\u0103m \u0111\u00ad\u1ee3c t\u1ea1o b\u1edfi 3 l\u1edbp d\u00e0y 15mm (hai l\u1edbp ngo\u00e0i m\u1ed7i l\u1edbp d\u00e0y 2.5mm, l\u1edbp gi\u1eefa 10mm). T\u1ef7 tr\u1ecdng g\u1ed7 0.7-0.45 gr\/cm3<\/sup>. Ch\u1ea5t k\u1ebft d\u00ednh l\u00e0 Ure resin v\u00e0 Emulsified isocyanate resin; T\u1ef7 l\u1ec7 th\u00eam ch\u1ea5t d\u00ednh l\u1ecfng cho l\u1edbp ngo\u00e0i l\u00e0 13%, l\u1edbp trong 8% (C\u00f3 th\u1eed nghi\u1ec7m kh\u00e1c l\u00e0 8% v\u00e0 5% t\u00ad\u01a1ng \u1ee9ng). \u0110\u1ed9 \u1ea9m l\u1edbp ngo\u00e0i 18%, l\u1edbp trong10%.<\/p>\n

\u0110i\u1ec1u ki\u1ec7n \u00e9p: \u00e9p ph\u1eb3ng n\u00f3ng \u1edf nhi\u1ec7t \u0111\u1ed9 160 \u00b0C, \u00e1p l\u1ef1c 25 kg \/cm2<\/sup>, th\u1eddi gian 5 ph\u00fat.<\/p>\n

K\u1ebft qu\u1ea3 th\u1eed nghi\u1ec7m cho th\u1ea5y: L\u1ef1c ch\u1ecbu u\u1ed1n trung b\u00ecnh, m\u00f4\u0111un \u0111\u00e0n h\u1ed3i cao, \u0111\u1ed9 d\u00e3n n\u1edf th\u1ea5p. \u0110i\u1ec1u ki\u1ec7n \u00e9p tr\u00ean l\u00e0 r\u1ea5t t\u1ed1t \u0111\u1ec3 t\u1ea1o v\u00e1n d\u0103m t\u1eeb Keo lai. Tuy nhi\u00ean, c\u1ea7n nghi\u00ean c\u1ee9u th\u00eam v\u1ec1 ch\u1ea5t keo d\u00ednh Ure resin v\u00e0 c\u1ea7n gi\u1ea3m \u0111\u1ed9 ki\u1ec1m c\u1ee7a d\u0103m xu\u1ed1ng c\u00f2n 0.5 nh\u00ad ti\u00eau chu\u1ea9n.<\/p>\n

6. Ti\u1ec1m n\u0103ng s\u1eed d\u1ee5ng g\u1ed7 Keo lai trong ch\u1ebf bi\u1ebfn \u0111\u1ed3 gia d\u1ee5ng<\/strong><\/p>\n

C\u00f2n qu\u00e1 s\u1edbm \u0111\u1ec3 n\u00f3i v\u1ec1 ti\u1ec1m n\u0103ng l\u00e0m \u0111\u1ed3 g\u1ed7 gia d\u1ee5ng t\u1eeb Keo lai, nh\u00adng c\u00e1c th\u1eed nghi\u1ec7m ban \u0111\u1ea7u khi s\u1eed d\u1ee5ng g\u1ed7 Keo lai l\u00e0m k\u1ec7 s\u00e1ch, k\u1ec7 m\u00e1y thu h\u00ecnh, ch\u00e2n b\u00e0n gh\u1ebf, gi\u00e1 \u0111\u1ec3 b\u0103ng \u0111\u0129a c\u00f3 b\u1ecdc l\u1edbp nh\u1ef1a Simili \u0111\u00e3 t\u1ea1o ra c\u00e1c s\u1ea3n ph\u1ea9m kh\u00e1 \u0111\u1eb9p m\u1eaft v\u1edbi v\u00e2n g\u1ed7 \u0111\u1eb9p, ch\u00ada b\u1ecb co r\u00fat, bi\u1ebfn d\u1ea1ng trong th\u1eddi gian th\u1eed nghi\u1ec7m ng\u1eafn .<\/p>\n

7. Nh\u1eefng \u0111i\u1ec1u c\u1ea7n l\u00adu \u00fd khi tr\u1ed3ng r\u1eebng Keo lai .<\/strong><\/p>\n

Tr\u00ad\u1edbc h\u1ebft ph\u1ea3i x\u00e1c \u0111\u1ecbnh gi\u1ed1ng c\u00e2y \u0111\u00ad\u1ee3c ch\u1ecdn \u0111\u1ec3 tr\u1ed3ng c\u00f3 th\u1ef1c s\u1ef1 l\u00e0 gi\u1ed1ng lai hay kh\u00f4ng? Khi quan s\u00e1t h\u00ecnh th\u00e1i giai \u0111o\u1ea1n c\u00e2y con r\u1ea5t kh\u00f3 x\u00e1c \u0111\u1ecbnh, n\u1ebfu kh\u00f4ng c\u00f3 kinh nghi\u1ec7m v\u00e0 chuy\u00ean m\u00f4n. Ch\u1ecdn h\u1ea1t Keo lai l\u1ea1i c\u00e0ng kh\u00f3. N\u1ebfu l\u1ea5y h\u1ea1t t\u1eeb c\u00e2y lai th\u00ec c\u00e2y con sau khi gieo t\u1ea1o, t\u1ef7 l\u1ec7 c\u00e2y lai r\u1ea5t th\u1ea5p, th\u00ad\u1eddng d\u00ad\u1edbi 40%, do b\u1ecb ph\u00e2n ly t\u00ednh tr\u1ea1ng; s\u1ed1 c\u00f2n l\u1ea1i sinh tr\u00ad\u1edfng kh\u00f4ng \u0111\u00e1p \u1ee9ng \u0111\u00ad\u1ee3c m\u1ee5c ti\u00eau \u0111\u1ec1 ra. Do v\u1eady c\u00e1c c\u01a1 s\u1edf tr\u1ed3ng r\u1eebng n\u00ean li\u00ean h\u1ec7 v\u1edbi c\u00e1c c\u01a1 quan c\u00f3 chuy\u00ean m\u00f4n v\u1ec1 gi\u1ed1ng c\u00e2y l\u00e2m nghi\u1ec7p, c\u00f3 ngu\u1ed3n l\u00adu tr\u1eef c\u00e1c gi\u1ed1ng lai v\u1edbi l\u00fd l\u1ecbch c\u00e2y lai r\u00f5 r\u00e0ng. T\u1eeb ngu\u1ed3n gi\u1ed1ng n\u00e0y, n\u00ean nh\u00e2n gi\u1ed1ng v\u00f4 t\u00ednh b\u1eb1ng gi\u00e2m hom ho\u1eb7c nu\u00f4i c\u1ea5y m\u00f4, tr\u00ad\u1edbc h\u1ebft l\u00e0 gi\u00e2m hom v\u00ec k\u1ef9 thu\u1eadt \u0111\u01a1n gi\u1ea3n, \u0111\u1ea7u t\u00ad th\u1ea5p v\u00e0 ch\u1ee7 \u0111\u1ed9ng t\u1ef1 nh\u00e2n gi\u1ed1ng \u0111\u1ec3 c\u00f3 c\u00e2y hom tr\u1ed3ng r\u1eebng .<\/p>\n

M\u1ed9t nh\u00ad\u1ee3c \u0111i\u1ec3m c\u1ee7a qu\u1ea7n th\u1ee5 r\u1eebng tr\u1ed3ng thu\u1ea7n lo\u1ea1i Keo lai l\u00e0 c\u00e2y th\u00ad\u1eddng b\u1ecb g\u00e3y, \u0111\u1ed5 khi gi\u00f3 l\u1edbn, do \u0111\u00f3 c\u1ea7n l\u00adu \u00fd khi thi\u1ebft k\u1ebf h\u00ad\u1edbng h\u00e0ng c\u00e2y tr\u1ed3ng, tr\u1ed3ng xen theo b\u0103ng ho\u1eb7c t\u1eebng l\u00f4 v\u1edbi c\u00e1c lo\u00e0i c\u00e2y kh\u00e1c.<\/p>\n

K\u1ebft lu\u1eadn <\/strong><\/p>\n

Keo lai c\u1ee7a hai lo\u00e0i Keo l\u00e1 nh\u1ecf v\u00e0 Keo l\u00e1 l\u1edbn c\u00f3 nhi\u1ec1u \u00adu \u0111i\u1ec3m v\u1ec1 s\u1ee9c sinh tr\u00ad\u1edfng nhanh. Ti\u1ec1m n\u0103ng s\u1eed d\u1ee5ng Keo lai r\u1ea5t l\u1edbn trong vi\u1ec7c s\u1ea3n xu\u1ea5t b\u1ed9t gi\u1ea5y, l\u00e0m v\u00e1n \u00e9p, v\u00e1n d\u0103m v\u00e0 \u0111\u1ed3 gia d\u1ee5ng. L\u00e0 lo\u00e0i c\u00e2y h\u1ecd \u0111\u1eadu c\u00f3 t\u00e1c d\u1ee5ng c\u1ea3i t\u1ea1o \u0111\u1ea5t t\u1ed1t, d\u1ec5 tr\u1ed3ng, mau thu ho\u1ea1ch, kh\u00f4ng k\u00e9n \u0111\u1ea5t, s\u1ea3n ph\u1ea9m \u0111\u00ad\u1ee3c th\u1ecb tr\u00ad\u1eddng ch\u1ea5p thu\u1eadn n\u00ean c\u1ea7n c\u00f3 k\u1ebf ho\u1ea1ch ph\u00e1t tri\u1ec3n lo\u00e0i c\u00e2y n\u00e0y trong c\u00e1c ch\u00ad\u01a1ng tr\u00ecnh tr\u1ed3ng r\u1eebng. Trong qu\u00e1 tr\u00ecnh ph\u00e1t tri\u1ec3n \u0111\u1ea1i tr\u00e0 c\u00e1c r\u1eebng tr\u1ed3ng Keo lai, c\u1ea7n ph\u1ea3i bi\u1ebft r\u00f5 ngu\u1ed3n g\u1ed1c gi\u1ed1ng lai, t\u1ef1 ch\u1ee7 \u0111\u1ed9ng nh\u00e2n gi\u1ed1ng lai b\u1eb1ng k\u1ef9 thu\u1eadt nh\u00e2n gi\u1ed1ng v\u00f4 t\u00ednh, tr\u00ad\u1edbc h\u1ebft b\u1eb1ng k\u1ef9 thu\u1eadt gi\u00e2m hom.<\/p>\n

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

1. L\u00ea \u0110\u00ecnh Kh\u1ea3, Ti\u1ec1m n\u0103ng l\u00e0m b\u1ed9t gi\u1ea5y c\u1ee7a Keo lai- K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u khoa h\u1ecdc v\u1ec1 ch\u1ecdn gi\u1ed1ng c\u00e2y r\u1eebng. Nh\u00e0 Xu\u1ea5t b\u1ea3n N\u00f4ng nghi\u1ec7p, H\u00e0 N\u1ed9i, 1997.<\/p>\n

2. Ph\u1ea1m Th\u1ebf D\u0169ng, Intensive Techniques of Plantation for Pulp Material in South Vietnam. Proceeding in Bangkok Workshop ,1996.<\/p>\n

3. Japan Association for Research and Development on Fast Growing Tree Species: Experiment Fabrication of LVT and PB from Hybrid Acacia. March 1999.<\/p>\n

SUMMARY<\/strong><\/p>\n

Acacia hybrid<\/em>does not only has high potentiality in growth but potential use of its wood is also very high. Results of wood sample study and analysis show that the pulping capacity of Acacia hybrid<\/em> wood is very good expressing through cellulose content, lignin, wood density and required indices of pulp. Tested samples of pressed and particle board made of Acacia hybrid<\/em> wood show that the indices as bending strength, rupture strength, density and other quality indices are upto the standards of Japan. In forest planting attention must be paid to the seed source of the hybrid. The seed source must have been selected and approved through progeny testing in forest research units appointed by the Ministry of Agriculture and Rural Development.<\/p>\n","protected":false},"excerpt":{"rendered":"

S\u1ef1 xu\u1ea5t hi\u1ec7n l\u1ea7n \u0111\u1ea7u tiên c\u1ee7a Keo lai (A.Hybrid) gi\u1eefa 2 loài A.mangium và A.auriculyformis \u0111­\u1ee3c Messrs Hepburn và Shim ghi nh\u1eadn vào n\u0103m 1972 t\u1ea1i các hàng cây bên \u0111­\u1eddng \u1edf Sook, úc; Sau \u0111ó vào tháng 7 n\u0103m 1978, Pedley (ng­\u1eddi úc) kh\u1eb3ng \u0111\u1ecbnh \u0111ó chính là gi\u1ed1ng lai. Cây lai c\u1ee7a hai loài A.magum Willd và A.auriculyformis ex Cunn Benth c\u0169ng \u0111­\u1ee3c khám phá t\u1ea1i Sabah Malaysia vào cu\u1ed1i n\u0103m 1970 ( FAO, 1982). <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[18],"tags":[],"_links":{"self":[{"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/8627"}],"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=8627"}],"version-history":[{"count":3,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/8627\/revisions"}],"predecessor-version":[{"id":19426,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/8627\/revisions\/19426"}],"wp:attachment":[{"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/media?parent=8627"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/categories?post=8627"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/tags?post=8627"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}