{"id":14972,"date":"2015-04-22T11:21:46","date_gmt":"2015-04-22T04:21:46","guid":{"rendered":"http:\/\/vafs.gov.vn\/vn\/?p=14972"},"modified":"2015-04-20T11:28:46","modified_gmt":"2015-04-20T04:28:46","slug":"bao-cao-ket-qua-de-tai-nghien-cuu-he-thong-cac-bien-phap-ky-thuat-lam-sinh-de-xuc-tien-tai-sinh-rung-keo-tai-tuong-acacia-mamgium-willd-nham-nang-cao-nang-suat-va-hieu-qua-kinh-te-cua-trong-rung-co","status":"publish","type":"post","link":"https:\/\/vafs.gov.vn\/vn\/bao-cao-ket-qua-de-tai-nghien-cuu-he-thong-cac-bien-phap-ky-thuat-lam-sinh-de-xuc-tien-tai-sinh-rung-keo-tai-tuong-acacia-mamgium-willd-nham-nang-cao-nang-suat-va-hieu-qua-kinh-te-cua-trong-rung-co\/","title":{"rendered":"B\u00e1o c\u00e1o k\u1ebft qu\u1ea3 \u0111\u1ec1 t\u00e0i: Nghi\u00ean c\u1ee9u h\u1ec7 th\u1ed1ng c\u00e1c bi\u1ec7n ph\u00e1p k\u1ef9 thu\u1eadt l\u00e2m sinh \u0111\u1ec3 x\u00fac ti\u1ebfn t\u00e1i sinh r\u1eebng Keo tai t\u01b0\u1ee3ng (Acacia mamgium Willd) nh\u1eb1m n\u00e2ng cao n\u0103ng su\u1ea5t v\u00e0 hi\u1ec7u qu\u1ea3 kinh t\u1ebf c\u1ee7a tr\u1ed3ng r\u1eebng c\u00f4ng nghi\u1ec7p \u1edf c\u00e1c t\u1ec9nh mi\u1ec1n n\u00fai ph\u00eda B\u1eafc"},"content":{"rendered":"

\u0110\u1ec1 t\u00e0i: \u201cNghi\u00ean c\u1ee9u h\u1ec7 th\u1ed1ng c\u00e1c bi\u1ec7n ph\u00e1p k\u1ef9 thu\u1eadt l\u00e2m sinh \u0111\u1ec3 x\u00fac ti\u1ebfn t\u00e1i sinh r\u1eebng Keo tai t\u01b0\u1ee3ng (Acacia mamgium <\/i>Willd) nh\u1eb1m n\u00e2ng cao n\u0103ng su\u1ea5t v\u00e0 hi\u1ec7u qu\u1ea3 kinh t\u1ebf c\u1ee7a tr\u1ed3ng r\u1eebng c\u00f4ng nghi\u1ec7p \u1edf c\u00e1c t\u1ec9nh mi\u1ec1n n\u00fai ph\u00eda B\u1eafc<\/i>\u201d \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n nh\u1eb1m \u0111\u00e1nh gi\u00e1 kh\u1ea3 n\u0103ng t\u1ea1o r\u1eebng b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p t\u00e1i sinh sau khai th\u00e1c. Nghi\u00ean c\u1ee9u n\u00e0y s\u1ebd l\u00e0 c\u01a1 s\u1edf \u0111\u1ec3 ho\u00e0n thi\u1ec7n quy tr\u00ecnh x\u00fac ti\u1ebfn t\u00e1i sinh t\u1ef1 nhi\u00ean r\u1eebng. \u0110\u1ed3ng th\u1eddi g\u00f3p ph\u1ea7n t\u00ecm ph\u01b0\u01a1ng ph\u00e1p t\u1ea1o r\u1eebng v\u1edbi chi ph\u00ed th\u1ea5p do t\u1eadn d\u1ee5ng \u0111\u01b0\u1ee3c ngu\u1ed3n h\u1ea1t gi\u1ed1ng s\u1eb5n c\u00f3, kh\u00f4ng qua giai \u0111o\u1ea1n v\u01b0\u1eddn \u01b0\u01a1m cho tr\u1ed3ng r\u1eebng ph\u00f2ng h\u1ed9 c\u0169ng nh\u01b0 r\u1eebng s\u1ea3n xu\u1ea5t, \u0111\u1eb7c bi\u1ec7t cho quy m\u00f4 h\u1ed9 gia \u0111\u00ecnh, n\u01a1i c\u00f2n thi\u1ebfu kinh ph\u00ed \u0111\u1ea7u t\u01b0 tr\u1ed3ng r\u1eebng b\u1eb1ng c\u00e2y con c\u00f3 b\u1ea7u \u1edf c\u00e1c t\u1ec9nh v\u00f9ng n\u00fai ph\u00eda B\u1eafc.<\/p>\n

\"15-04-20<\/a><\/p>\n

II. N\u1ed8I DUNG V\u00c0 PH\u01af\u01a0NG PH\u00c1P NGHI\u00caN C\u1ee8U<\/b><\/p>\n

2.1. N\u1ed9i dung nghi\u00ean c\u1ee9u<\/b><\/p>\n

1) \u0110i\u1ec1u tra, \u0111\u00e1nh gi\u00e1 th\u1ef1c tr\u1ea1ng v\u00e0 \u0111\u1eb7c \u0111i\u1ec3m t\u00e1i sinh c\u1ee7a Keo tai t\u01b0\u1ee3ng t\u1ea1i c\u00e1c \u0111\u1ecba ph\u01b0\u01a1ng<\/p>\n

2) Nghi\u00ean c\u1ee9u \u1ea3nh h\u01b0\u1edfng c\u1ee7a c\u00e1c nh\u00e2n t\u1ed1 li\u00ean quan \u0111\u1ebfn s\u1ed1 l\u01b0\u1ee3ng, ch\u1ea5t l\u01b0\u1ee3ng h\u1ea1t gi\u1ed1ng v\u00e0 sinh tr\u01b0\u1edfng c\u1ee7a c\u00e2y t\u00e1i sinh.<\/p>\n

3) Nghi\u00ean c\u1ee9u \u1ea3nh h\u01b0\u1edfng c\u1ee7a m\u1ed9t s\u1ed1 bi\u1ec7n ph\u00e1p k\u1ef9 thu\u1eadt l\u00e2m sinh \u0111\u1ebfn t\u00e1i sinh t\u1ef1 nhi\u00ean Keo tai t\u01b0\u1ee3ng<\/p>\n

4) Nghi\u00ean c\u1ee9u \u1ea3nh h\u01b0\u1edfng c\u1ee7a c\u00e1c bi\u1ec7n ph\u00e1p nu\u00f4i d\u01b0\u1ee1ng \u0111\u1ebfn sinh tr\u01b0\u1edfng c\u00e2y t\u00e1i sinh<\/p>\n

5) Tr\u1ed3ng r\u1eebng \u0111\u1ed1i ch\u1ee9ng b\u1eb1ng c\u00e2y con c\u00f3 b\u1ea7u<\/p>\n

2.2. Ph\u01b0\u01a1ng ph\u00e1p nghi\u00ean c\u1ee9u<\/b><\/p>\n

2.2.1. \u0110\u1ecba \u0111i\u1ec3m, th\u1eddi gian n\u01a1i b\u1ed1 tr\u00ed th\u00ed nghi\u1ec7m<\/i><\/b><\/p>\n

Th\u00ed nghi\u1ec7m \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n t\u1ea1i x\u00e3 \u0110\u00f4ng Th\u1ecd, hu\u1ef5\u1ec7n S\u01a1n D\u01b0\u01a1ng, t\u1ec9nh Tuy\u00ean Quang v\u00e0 x\u00e3 Quy M\u00f4ng, huy\u1ec7n Tr\u1ea5n Y\u00ean, t\u1ec9nh Y\u00ean B\u00e1i trong th\u1eddi gian t\u1eeb n\u0103m 2006-2008.<\/p>\n

2.2.2. Ph\u01b0\u01a1ng ph\u00e1p nghi\u00ean c\u1ee9u th\u1ef1c tr\u1ea1ng v\u00e0 \u0111\u1eb7c \u0111i\u1ec3m t\u00e1i sinh c\u1ee7a Keo tai t\u01b0\u1ee3ng trong v\u00f9ng nghi\u00ean c\u1ee9u<\/i><\/b><\/p>\n

– \u0110i\u1ec1u tra di\u1ec7n t\u00edch tr\u1ed3ng, \u0111\u1eb7c \u0111i\u1ec3m sinh tr\u01b0\u1edfng, c\u01a1 c\u1ea5u tu\u1ed5i v\u00e0 hi\u1ec7n tr\u1ea1ng khai th\u00e1c c\u1ee7a r\u1eebng Keo tai t\u01b0\u1ee3ng t\u1ea1i khu v\u1ef1c nghi\u00ean c\u1ee9u.<\/p>\n

– L\u1eadp \u00f4, \u0111i\u1ec1u tra s\u1ed1 l\u01b0\u1ee3ng c\u00e2y t\u00e1i sinh, \u0111o chi\u1ec1u cao, \u0111\u01b0\u1eddng k\u00ednh th\u00e2n c\u00e2y v\u00e0 ch\u1ea5t l\u01b0\u1ee3ng c\u00e2y.<\/p>\n

2.2.3. Ph\u01b0\u01a1ng ph\u00e1p nghi\u00ean c\u1ee9u \u1ea3nh h\u01b0\u1edfng c\u1ee7a c\u00e1c nh\u00e2n t\u1ed1 li\u00ean quan \u0111\u1ebfn s\u1ed1 l\u01b0\u1ee3ng, ch\u1ea5t l\u01b0\u1ee3ng h\u1ea1t gi\u1ed1ng v\u00e0 sinh tr\u01b0\u1edfng c\u1ee7a c\u00e2y t\u00e1i sinh.<\/i><\/b><\/p>\n

\u0110\u00e1nh gi\u00e1 l\u01b0\u1ee3ng h\u1ea1t r\u01a1i d\u01b0\u1edbi \u0111\u1ea5t trong c\u00e1c \u00f4 1 m2<\/sup>. \u0110\u1ebfm s\u1ed1 h\u1ea1t thu \u0111\u01b0\u1ee3c c\u00f3 trong \u00f4 v\u00e0 quy \u0111\u1ed5i th\u00e0nh l\u01b0\u1ee3ng h\u1ea1t tr\u00ean ha. H\u1ea1t thu \u0111\u01b0\u1ee3c, \u00a0x\u1eed l\u00fd trong n\u01b0\u1edbc s\u00f4i, sau \u0111\u00f3 gieo trong c\u00e1t \u1ea9m v\u00e0 theo d\u00f5i n\u1ea3y m\u1ea7m trong \u0111i\u1ec1u ki\u1ec7n nhi\u1ec7t \u0111\u1ed9 trong ph\u00f2ng.<\/p>\n

2.2.4. Ph\u01b0\u01a1ng ph\u00e1p nghi\u00ean c\u1ee9u \u1ea3nh h\u01b0\u1edfng c\u1ee7a m\u1ed9t s\u1ed1 bi\u1ec7n ph\u00e1p k\u1ef9 thu\u1eadt l\u00e2m sinh \u0111\u1ebfn t\u00e1i sinh c\u1ee7a Keo tai t\u01b0\u1ee3ng<\/i><\/b><\/p>\n

Ph\u01b0\u01a1ng ph\u00e1p l\u00e0m \u0111\u1ea5t (x\u1edbi \u0111\u1ea5t v\u00e0 kh\u00f4ng x\u1edbi \u0111\u1ea5t); ph\u01b0\u01a1ng ph\u00e1p x\u1eed l\u00fd th\u1ef1c b\u00ec (gom th\u1ef1c b\u00ec th\u00e0nh h\u00e0ng v\u00e0 r\u1ea3i \u0111\u1ec1u th\u1ef1c b\u00ec sau \u0111\u00f3 \u0111\u1ed1t); b\u1ed1 tr\u00ed th\u00ed nghi\u1ec7m theo \u0111\u1ed9 d\u1ed1c kh\u00e1c nhau (4 c\u1ea5p \u0111\u1ed9 l\u00e0 <150<\/sup>C, 15-250<\/sup>C, 25-350<\/sup>C v\u00e0 > 350<\/sup>).<\/p>\n

2.2.5. Ph\u01b0\u01a1ng ph\u00e1p nghi\u00ean c\u1ee9u \u1ea3nh h\u01b0\u1edfng c\u1ee7a c\u00e1c bi\u1ec7n ph\u00e1p l\u00e2m sinh \u0111\u1ebfn sinh tr\u01b0\u1edfng Keo tai t\u01b0\u1ee3ng t\u00e1i sinh<\/i><\/b><\/p>\n

– Nghi\u00ean c\u1ee9u t\u1ec9a th\u01b0a<\/i>:<\/p>\n

T\u1ec9a th\u01b0a \u0111\u01b0\u1ee3c ti\u1ebfn h\u00e0nh l\u00e0m 3 \u0111\u1ee3t, m\u1eadt \u0111\u1ed9 cu\u1ed1i c\u00f9ng l\u00e0: 1250 c\u00e2y\/ha; 1666 c\u00e2y\/ha v\u00e0 2000 c\u00e2y\/ha.<\/p>\n

– Nghi\u00ean c\u1ee9u x\u1edbi \u0111\u1ea5t v\u00e0 b\u00f3n ph\u00e2n<\/i>:<\/p>\n

Sau khi k\u1ebft th\u00fac giai \u0111o\u1ea1n t\u1ec9a th\u01b0a, ti\u1ebfn h\u00e0nh x\u1edbi \u0111\u1ea5t theo hai ph\u01b0\u01a1ng th\u1ee9c l\u00e0 x\u1edbi \u0111\u1ea5t quanh g\u1ed1c v\u00e0 kh\u00f4ng x\u1edbi \u0111\u1ea5t; b\u00f3n ph\u00e2n \u0111\u01b0\u1ee3c ti\u1ebfn h\u00e0nh b\u00f3n th\u00fac theo 3 m\u1ee9c \u0111\u1ed9 (50g\/c\u00e2y, 100g\/c\u00e2y v\u00e0 200g\/c\u00e2y) ti\u1ebfn h\u00e0nh cho 2 lo\u1ea1i m\u1eadt \u0111\u1ed9 l\u00e0 1250c\u00e2y\/ha (2mx2,5m) v\u00e0 1666 c\u00e2y\/ha (2mx3m).<\/p>\n

2.4.6. Ph\u01b0\u01a1ng ph\u00e1p nghi\u00ean c\u1ee9u tr\u1ed3ng r\u1eebng \u0111\u1ed1i ch\u1ee9ng b\u1eb1ng c\u00e2y con c\u00f3 b\u1ea7u<\/i><\/b><\/p>\n

Tr\u1ed3ng r\u1eebng \u0111\u1ed1i ch\u1ee9ng b\u1eb1ng c\u00e2y con c\u00f3 b\u1ea7u \u0111\u01b0\u1ee3c ti\u1ebfn h\u00e0nh tr\u00ean 3 ha v\u1edbi m\u1eadt \u0111\u1ed9 l\u00e0 1250 c\u00e2y\/ha, 1666 c\u00e2y\/ha v\u00e0 2000 c\u00e2y\/ha. Tai Tuy\u00ean Quang, gi\u1ed1ng \u0111\u01b0\u1ee3c l\u1ea5y t\u1eeb xu\u1ea5t x\u1ee9 Papua New Guinea, c\u00f2n \u1edf Y\u00ean B\u00e1i l\u00e0 gi\u1ed1ng kh\u00f4ng c\u00f3 ngu\u1ed3n g\u1ed1c \u0111\u01b0\u1ee3c b\u00e1n t\u1ea1i \u0111\u1ecba ph\u01b0\u01a1ng.<\/p>\n

2.4.7. Ph\u01b0\u01a1ng ph\u00e1p n\u1ed9i nghi\u1ec7p<\/b><\/p>\n

S\u1ed1 li\u1ec7u \u0111\u01b0\u1ee3c ph\u00e2n t\u00edch b\u1eb1ng ph\u1ea7n m\u1ec1m Excel v\u00e0 S.A.S. S\u1ef1 kh\u00e1c nhau gi\u1eefa c\u00e1c c\u00f4ng th\u1ee9c th\u00ed nghi\u1ec7m \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 b\u1eb1ng ch\u1ec9 ti\u00eau Duncan.<\/p>\n

\u00a0<\/b><\/p>\n

III: <\/b>K\u1ebeT QU\u1ea2 NGHI\u00caN C\u1ee8U V\u00c0 TH\u1ea2O LU\u1eacN<\/b><\/p>\n

3.1. Th\u1ef1c tr\u1ea1ng v\u00e0 \u0111\u1eb7c \u0111i\u1ec3m t\u00e1i sinh c\u1ee7a Keo tai t\u01b0\u1ee3ng sau khai th\u00e1c \u1edf v\u00f9ng nghi\u00ean c\u1ee9u<\/b><\/p>\n

3.1.1. Th\u1ef1c tr\u1ea1ng t\u00e1i sinh t\u1ef1 nhi\u00ean Keo tai t\u01b0\u1ee3ng<\/i><\/b><\/i><\/b><\/p>\n

T\u1ea1i c\u00e1c t\u1ec9nh mi\u1ec1n B\u1eafc, Keo tai t\u01b0\u1ee3ng t\u00e1i sinh c\u00f3 nhi\u1ec1u t\u1ea1i c\u00e1c t\u1ec9nh Tuy\u00ean Quang, Y\u00ean B\u00e1i v\u00e0 H\u00f2a B\u00ecnh.<\/p>\n

3.1.2. \u0110\u1eb7c \u0111i\u1ec3m t\u00e1i sinh c\u1ee7a Keo tai t\u01b0\u1ee3ng<\/i><\/b><\/i><\/b><\/p>\n

N\u1ebfu ch\u01b0a t\u1ec9a th\u01b0a, m\u1eadt \u0111\u1ed9 trung b\u00ecnh c\u1ee7a Keo tai t\u01b0\u1ee3ng t\u00e1i sinh d\u01b0\u1edbi 6 th\u00e1ng tu\u1ed5i dao \u0111\u1ed9ng t\u1eeb 286.000-326.000 c\u00e2y\/ha, tuy nhi\u00ean \u0111\u1ebfn 36 th\u00e1ng tu\u1ed5i, m\u1eadt \u0111\u1ed9 gi\u1ea3m c\u00f2n t\u1eeb 75.800-94.300 c\u00e2y\/ha.<\/p>\n

\u0110\u1ed1i v\u1edbi nh\u1eefng di\u1ec7n t\u00edch r\u1eebng \u0111\u00e3 \u0111\u01b0\u1ee3c \u0111i\u1ec1u ch\u1ec9nh m\u1eadt \u0111\u1ed9, t\u1ea1i c\u00e1c l\u00e2m tr\u01b0\u1eddng\u00a0 m\u1eadt \u0111\u1ed9 c\u00f2n l\u1ea1i t\u1eeb 1.100-1.800 c\u00e2y\/ha, \u0111\u1ed1i v\u1edbi nh\u1eefng h\u1ed9 gia \u0111\u00ecnh, m\u1eadt \u0111\u1ed9 c\u00e2y t\u00e1i sinh l\u00ean t\u1edbi tr\u00ean 4.000 c\u00e2y\/ha khi c\u00e2y \u1edf tu\u1ed5i 4.<\/p>\n

Sau 6 n\u0103m tu\u1ed5i \u0111\u01b0\u1eddng k\u00ednh \u0111\u1ea1t 12,8 cm, chi\u1ec1u cao \u0111\u1ea1t 11,4cm v\u00e0 t\u1edbi tu\u1ed5i 10, v\u1edbi m\u1eadt \u0111\u1ed9 780 c\u00e2y\/ha th\u00ec \u0111\u01b0\u1eddng k\u00ednh trung b\u00ecnh 16,4cm, chi\u1ec1u cao \u0111\u1ea1t 16,1m.<\/p>\n

3.2. M\u1ed9t s\u1ed1 nh\u00e2n t\u1ed1 li\u00ean quan \u0111\u1ebfn s\u1ed1 l\u01b0\u1ee3ng, ch\u1ea5t l\u01b0\u1ee3ng h\u1ea1t gi\u1ed1ng v\u00e0 sinh tr\u01b0\u1edfng c\u1ee7a c\u00e2y t\u00e1i sinh<\/b><\/p>\n

\u00a0 3.2.1. <\/i>\u0110\u1eb7c \u0111i\u1ec3m v\u1eadt h\u1eadu h\u1ecdc v\u00e0 s\u1ea3n l\u01b0\u1ee3ng h\u1ea1t gi\u1ed1ng<\/i><\/h4>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/i><\/b>Keo tai t\u01b0\u1ee3ng b\u1eaft \u0111\u1ea7u ra hoa t\u1eeb tu\u1ed5i 4. Ra hoa v\u00e0o th\u00e1ng 9 – 10. Qu\u1ea3 ch\u00edn v\u00e0o th\u00e1ng 4 – 5 n\u0103m sau, s\u1ef1 ch\u00eanh l\u1ec7ch v\u1ec1 th\u1eddi gian ra hoa, k\u1ebft qu\u1ea3 \u1edf c\u00e1c \u0111\u1ecba ph\u01b0\u01a1ng kh\u00e1c nhau v\u00e0 gi\u1eefa c\u00e1c n\u0103m kh\u00e1c nhau trong v\u00f9ng nghi\u00ean c\u1ee9u kho\u1ea3ng 15 – 20 ng\u00e0y. Kh\u1ed1i l\u01b0\u1ee3ng h\u1ea1t Keo tai t\u01b0\u1ee3ng kho\u1ea3ng 90.000 h\u1ea1t\/kg. S\u1ed1 l\u01b0\u1ee3ng h\u1ea1t c\u00f3 tr\u00ean 1 c\u00e2y dao \u0111\u1ed9ng t\u1eeb 21.000 \u0111\u1ebfn 51.259 h\u1ea1t. L\u01b0\u1ee3ng h\u1ea1t gi\u1ed1ng Keo tai t\u01b0\u1ee3ng tr\u00ean c\u00e2y s\u1ebd dao \u0111\u1ed9ng t\u1eeb 10.080.000 \u0111\u1ebfn 27.449.195 h\u1ea1t\/ha, t\u01b0\u01a1ng \u1ee9ng t\u1eeb 112,0 \u0111\u1ebfn 305,0 kg\/ha\/v\u1ee5<\/p>\n

3.2.2. L\u01b0\u1ee3ng h\u1ea1t Keo tai t\u01b0\u1ee3ng r\u1ee5ng d\u01b0\u1edbi t\u00e1n r\u1eebng<\/i><\/b><\/p>\n

S\u1ed1 l\u01b0\u1ee3ng h\u1ea1t trong \u0111\u1ea5t d\u01b0\u1edbi t\u00e1n r\u1eebng Keo tai t\u01b0\u1ee3ng r\u1ea5t l\u1edbn, trung b\u00ecnh t\u1eeb 52,7 – 120,6 h\u1ea1t\/m2 <\/sup>(t\u01b0\u01a1ng \u0111\u01b0\u01a1ng 93.050.000 h\u1ea1t\/ha). L\u01b0\u1ee3ng h\u1ea1t d\u01b0\u1edbi ch\u00e2n \u0111\u1ed3i nhi\u1ec1u nh\u1ea5t, sau \u0111\u00f3 \u0111\u1ebfn \u0111\u1ec9nh \u0111\u1ed3i v\u00e0 s\u01b0\u1eddn \u0111\u1ed3i c\u00f3 \u00edt h\u1ea1t nh\u1ea5t.<\/p>\n

3.2.3. Ch\u1ea5t l\u01b0\u1ee3ng h\u1ea1t gi\u1ed1ng Keo tai t\u01b0\u1ee3ng\u00a0 <\/i><\/h4>\n

T\u1ef7 l\u1ec7 n\u1ea3y m\u1ea7m c\u1ee7a h\u1ea1t r\u01a1i d\u01b0\u1edbi \u0111\u1ea5t \u0111\u1ea1t 76,3%. V\u1edbi t\u1ef7 l\u1ec7 n\u00e0y, c\u00f3 th\u1ec3 xu\u1ea5t hi\u1ec7n kho\u1ea3ng 3,89 tri\u1ec7u c\u00e2y con\/ha. \u0110\u00e2y l\u00e0 m\u1ed9t con s\u1ed1 r\u1ea5t l\u1edbn so v\u1edbi m\u1eadt \u0111\u1ed9 r\u1eebng tr\u1ed3ng Keo tai t\u01b0\u1ee3ng \u0111ang \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng hi\u1ec7n nay.<\/p>\n

3.3. \u1ea2nh h\u01b0\u1edfng c\u1ee7a m\u1ed9t s\u1ed1 bi\u1ec7n ph\u00e1p k\u1ef9 thu\u1eadt l\u00e2m sinh \u0111\u1ebfn t\u00e1i sinh (h\u1ea1t n\u1ea3y m\u1ea7m) c\u1ee7a Keo tai t\u01b0\u1ee3ng sau khai th\u00e1c<\/b><\/p>\n

C\u00e2y t\u00e1i sinh xu\u1ea5t hi\u1ec7n 10 ng\u00e0y sau khi \u0111\u1ed1t th\u1ef1c b\u00ec. Do th\u1eddi \u0111i\u1ec3m xu\u1ea5t hi\u1ec7n m\u01b0a v\u00e0 s\u1ed1 ng\u00e0y m\u01b0a kh\u00e1c nhau n\u00ean th\u1eddi gian n\u1ea3y m\u1ea7m c\u1ee7a h\u1ea1t t\u1ea1i Tuy\u00ean Quang k\u00e9o d\u00e0i t\u1edbi 50 ng\u00e0y v\u00e0 \u1edf Y\u00ean B\u00e1i l\u00e0 40 ng\u00e0y.<\/p>\n

\u1ede Tuy\u00ean Quang t\u1ed5ng s\u1ed1 h\u1ea1t n\u1ea3y m\u1ea7m l\u00e0 tr\u00ean 1.000.000 h\u1ea1t\/ha, trong khi \u0111\u00f3 s\u1ed1 h\u1ea1t n\u1ea3y m\u1ea7m t\u1ea1i Y\u00ean B\u00e1i ch\u1ec9 tr\u00ean 200.000 h\u1ea1t\/ha. t\u1ef7 l\u1ec7 h\u1ea1t n\u1ea3y m\u1ea7m so v\u1edbi h\u1ea1t c\u00f3 trong \u0111\u1ea5t ch\u1ec9 \u0111\u1ea1t t\u1eeb 6-12%, tuy v\u1eady s\u1ed1 c\u00e2y c\u00f3 \u0111\u01b0\u1ee3c v\u1eabn l\u00e0 r\u1ea5t l\u1edbn so v\u1edbi m\u1eadt \u0111\u1ed9 c\u00e2y tr\u1ed3ng t\u1eeb 1000-2000 c\u00e2y\/ha.<\/p>\n

C\u1ea3 3 nh\u00e2n t\u1ed1 \u0111\u1ed9 d\u1ed1c, bi\u1ec7n ph\u00e1p x\u1eed l\u00fd th\u1ef1c b\u00ec v\u00e0 l\u00e0m \u0111\u1ea5t \u0111\u1ec1u c\u00f3 \u1ea3nh h\u01b0\u1edfng r\u00f5 r\u1ec7t \u0111\u1ebfn m\u1eadt \u0111\u1ed9 c\u00e2y t\u00e1i sinh Keo tai t\u01b0\u1ee3ng (P<0,05). Trong \u0111\u00f3, c\u00e2y t\u00e1i sinh l\u1edbn nh\u1ea5t \u1edf \u0111\u1ed9 d\u1ed1c t\u1eeb 26 – 35o<\/sup>, ti\u1ebfp theo l\u00e0 \u1edf \u0111\u1ed9 d\u1ed1c >35o<\/sup> v\u00e0 th\u1ea5p nh\u1ea5t l\u00e0 \u1edf \u0111\u1ed9 d\u1ed1c < 15o<\/sup>. \u1ede \u0111\u1ed9 d\u1ed1c t\u1eeb 15 – 25o<\/sup> s\u1ed1 l\u01b0\u1ee3ng c\u00e2y t\u00e1i sinh kh\u00f4ng kh\u00e1c v\u1ec1 m\u1eb7t th\u1ed1ng k\u00ea so v\u1edbi hai c\u1ea5p \u0111\u1ed9 d\u1ed1c <15o<\/sup> v\u00e0 >35o<\/sup>. Th\u1ef1c b\u00ec gom th\u00e0nh h\u00e0ng \u0111\u1ed1t cho nhi\u1ec1u c\u00e2y t\u00e1i sinh h\u01a1n so v\u1edbi th\u1ef1c b\u00ec r\u1ea3i \u0111\u1ec1u v\u00e0 \u0111\u1ed1t. Vi\u1ec7c x\u1edbi \u0111\u1ea5t c\u00f3 t\u00e1c d\u1ee5ng l\u00e0m cho \u0111\u1ea5t t\u01a1i x\u1ed1p, do \u0111\u00f3 khi \u0111\u1ed1t th\u1ef1c b\u00ec, nhi\u1ec7t \u0111\u1ed9 \u0111\u01b0\u1ee3c truy\u1ec1n xu\u1ed1ng c\u1ea3 nh\u1eefng l\u1edbp \u0111\u1ea5t ph\u00eda d\u01b0\u1edbi v\u00e0 gi\u1eef \u0111\u01b0\u1ee3c l\u00e2u h\u01a1n, l\u00e0m cho c\u1ea3 nh\u1eefng h\u1ea1t gi\u1ed1ng n\u1eb1m s\u00e2u trong \u0111\u1ea5t c\u0169ng \u0111\u01b0\u1ee3c k\u00edch th\u00edch v\u00ec v\u1eady s\u1ed1 l\u01b0\u1ee3ng c\u00e2y n\u1ea3y m\u1ea7m nhi\u1ec1u h\u01a1n h\u1eb3n so v\u1edbi tr\u01b0\u1eddng h\u1ee3p kh\u00f4ng x\u1edbi \u0111\u1ea5t. Ngo\u00e0i ra, trong qu\u00e1 tr\u00ecnh x\u1edbi \u0111\u1ea5t, m\u1ed9t s\u1ed1 h\u1ea1t n\u1eb1m trong l\u1edbp th\u1ea3m m\u1ee5c c\u0169ng \u0111\u01b0\u1ee3c r\u01a1i ra v\u00e0 n\u1eb1m s\u00e2u xu\u1ed1ng \u0111\u1ea5t, kh\u00f4ng b\u1ecb ch\u00e1y trong qu\u00e1 tr\u00ecnh \u0111\u1ed1t th\u1ef1c b\u00ec, k\u1ebft qu\u1ea3 l\u00e0m cho l\u01b0\u1ee3ng h\u1ea1t n\u1ea3y m\u1ea7m trong c\u00e1c th\u00ed nghi\u1ec7m x\u1edbi \u0111\u1ea5t cao h\u01a1n so v\u1edbi kh\u00f4ng x\u1edbi.<\/p>\n

3.4. \u1ea2nh h\u01b0\u1edfng c\u1ee7a c\u00e1c bi\u1ec7n ph\u00e1p l\u00e2m sinh \u0111\u1ebfn sinh tr\u01b0\u1edfng Keo tai t\u01b0\u1ee3ng t\u00e1i sinh<\/b><\/p>\n

Trong c\u00e1c bi\u1ec7n ph\u00e1p ch\u0103m s\u00f3c c\u00e2y con Keo tai t\u01b0\u1ee3ng sau khai th\u00e1c th\u00ec bi\u1ec7n ph\u00e1p t\u1ec9a th\u01b0a ch\u01b0a th\u1ea5y c\u00f3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn sinh tr\u01b0\u1edfng \u0111\u01b0\u1eddng k\u00ednh D1.3<\/sub> (P>0,05), t\u01b0\u01a1ng t\u1ef1 bi\u1ec7n ph\u00e1p l\u00e0m \u0111\u1ea5t c\u0169ng kh\u00f4ng \u1ea3nh h\u01b0\u1edfng r\u00f5 r\u1ec7t \u0111\u1ebfn sinh tr\u01b0\u1edfng c\u1ee7a c\u00e2y t\u00e1i sinh (P>0,05); c\u00f2n bi\u1ec7n ph\u00e1p b\u00f3n ph\u00e2n \u0111\u00e3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn sinh tr\u01b0\u1edfng \u0111\u01b0\u1eddng k\u00ednh c\u1ee7a c\u00e2y t\u00e1i sinh (P < 0,05). Tuy nhi\u00ean khi x\u00e9t \u0111\u1ebfn \u1ea3nh h\u01b0\u1edfng t\u01b0\u01a1ng t\u00e1c c\u1ee7a c\u1ea3 3 bi\u1ec7n ph\u00e1p ch\u0103m s\u00f3c (t\u1ec9a th\u01b0a + b\u00f3n ph\u00e2n + l\u00e0m \u0111\u1ea5t) \u0111\u1ebfn sinh tr\u01b0\u1edfng \u0111\u01b0\u1eddng k\u00ednh l\u1ea1i kh\u00f4ng r\u00f5 r\u00e0ng (P >0,05), xem b\u1ea3ng 3.1.<\/p>\n

B\u1ea3ng 3.1 \u1ea2nh h\u01b0\u1edfng t\u1ed5ng h\u1ee3p c\u1ee7a t\u1ec9a th\u01b0a + x\u1edbi \u0111\u1ea5t + b\u00f3n ph\u00e2n \u0111\u1ebfn sinh tr\u01b0\u1edfng \u0111\u01b0\u1eddng k\u00ednh D1.3<\/sub> v\u00e0 chi\u1ec1u cao (Hvn) c\u1ee7a Keo tai t\u01b0\u1ee3ng 3 n\u0103m sau khi x\u00fac ti\u00ean t\u00e1i sinh <\/b>t\u1ea1i Tuy\u00ean Quang v\u00e0 Y\u00ean B\u00e1i<\/b><\/p>\n

\u00a0<\/b><\/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

T\u1ec9a th\u01b0a<\/b><\/p>\n<\/td>\n

\n

B\u00f3n ph\u00e2n<\/b><\/p>\n<\/td>\n

\n

L\u00e0m \u0111\u1ea5t<\/b><\/p>\n<\/td>\n

\n

Tuy\u00ean Quang<\/b><\/p>\n<\/td>\n

\n

Y\u00ean B\u00e1i<\/b><\/p>\n<\/td>\n<\/tr>\n

<\/td>\n\n

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

<\/td>\n\n

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

<\/td>\n\n

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

<\/td>\n\n

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

\n

2x2m<\/p>\n<\/td>\n

\n

0,05 kg<\/p>\n<\/td>\n

Kh\u00f4ng x\u1edbi<\/td>\n\n

7,23<\/p>\n<\/td>\n

\n

0,280<\/p>\n<\/td>\n

\n

6,89<\/p>\n<\/td>\n

\n

0,820<\/p>\n<\/td>\n

\n

7,89<\/p>\n<\/td>\n

\n

0,286<\/p>\n<\/td>\n

\n

7,41<\/p>\n<\/td>\n

\n

0,842<\/p>\n<\/td>\n<\/tr>\n

X\u1edbi<\/td>\n\n

7,15<\/p>\n<\/td>\n

\n

7,35<\/p>\n<\/td>\n

\n

8,22<\/p>\n<\/td>\n

\n

7,34<\/p>\n<\/td>\n<\/tr>\n

\n

0,1 kg<\/p>\n<\/td>\n

Kh\u00f4ng x\u1edbi<\/td>\n\n

7,41<\/p>\n<\/td>\n

\n

7,02<\/p>\n<\/td>\n

\n

8,50<\/p>\n<\/td>\n

\n

7,35<\/p>\n<\/td>\n<\/tr>\n

X\u1edbi<\/td>\n\n

7,39<\/p>\n<\/td>\n

\n

7,20<\/p>\n<\/td>\n

\n

7,68<\/p>\n<\/td>\n

\n

7,00<\/p>\n<\/td>\n<\/tr>\n

\n

0,2 kg<\/p>\n<\/td>\n

Kh\u00f4ng x\u1edbi<\/td>\n\n

7,56<\/p>\n<\/td>\n

\n

7,33<\/p>\n<\/td>\n

\n

9,00<\/p>\n<\/td>\n

\n

7,80<\/p>\n<\/td>\n<\/tr>\n

X\u1edbi<\/td>\n\n

7,44<\/p>\n<\/td>\n

\n

7,89<\/p>\n<\/td>\n

\n

8,70<\/p>\n<\/td>\n

\n

7,40<\/p>\n<\/td>\n<\/tr>\n

\n

2x3m<\/p>\n<\/td>\n

\n

0,05 kg<\/p>\n<\/td>\n

Kh\u00f4ng x\u1edbi<\/td>\n\n

7,30<\/p>\n<\/td>\n

\n

7,39<\/p>\n<\/td>\n

\n

8,32<\/p>\n<\/td>\n

\n

7,30<\/p>\n<\/td>\n<\/tr>\n

X\u1edbi<\/td>\n\n

7,28<\/p>\n<\/td>\n

\n

6,95<\/p>\n<\/td>\n

\n

8,34<\/p>\n<\/td>\n

\n

7,00<\/p>\n<\/td>\n<\/tr>\n

\n

0,1 kg<\/p>\n<\/td>\n

Kh\u00f4ng x\u1edbi<\/td>\n\n

7,88<\/p>\n<\/td>\n

\n

7,27<\/p>\n<\/td>\n

\n

8,90<\/p>\n<\/td>\n

\n

7,20<\/p>\n<\/td>\n<\/tr>\n

X\u1edbi<\/td>\n\n

7,52<\/p>\n<\/td>\n

\n

7,14<\/p>\n<\/td>\n

\n

8,55<\/p>\n<\/td>\n

\n

7,12<\/p>\n<\/td>\n<\/tr>\n

\n

0,2 kg<\/p>\n<\/td>\n

Kh\u00f4ng x\u1edbi<\/td>\n\n

7,99<\/p>\n<\/td>\n

\n

7,12<\/p>\n<\/td>\n

\n

9,60<\/p>\n<\/td>\n

\n

7,30<\/p>\n<\/td>\n<\/tr>\n

X\u1edbi<\/td>\n\n

7,60<\/p>\n<\/td>\n

\n

7,21<\/p>\n<\/td>\n

\n

8,90<\/p>\n<\/td>\n

\n

7,12<\/p>\n<\/td>\n<\/tr>\n

\n

2x4m<\/p>\n<\/td>\n

\n

0,05 kg<\/p>\n<\/td>\n

Kh\u00f4ng x\u1edbi<\/td>\n\n

7,40<\/p>\n<\/td>\n

\n

7,32<\/p>\n<\/td>\n

\n

9,00<\/p>\n<\/td>\n

\n

7,00<\/p>\n<\/td>\n<\/tr>\n

X\u1edbi<\/td>\n\n

7,42<\/p>\n<\/td>\n

\n

7,40<\/p>\n<\/td>\n

\n

7,98<\/p>\n<\/td>\n

\n

7,20<\/p>\n<\/td>\n<\/tr>\n

\n

0,1 kg<\/p>\n<\/td>\n

Kh\u00f4ng x\u1edbi<\/td>\n\n

7,60<\/p>\n<\/td>\n

\n

7,13<\/p>\n<\/td>\n

\n

9,60<\/p>\n<\/td>\n

\n

6,80<\/p>\n<\/td>\n<\/tr>\n

X\u1edbi<\/td>\n\n

7,58<\/p>\n<\/td>\n

\n

7,00<\/p>\n<\/td>\n

\n

9,40<\/p>\n<\/td>\n

\n

7,00<\/p>\n<\/td>\n<\/tr>\n

\n

0,2 kg<\/p>\n<\/td>\n

Kh\u00f4ng x\u1edbi<\/td>\n\n

8,32<\/p>\n<\/td>\n

\n

7,30<\/p>\n<\/td>\n

\n

9,80<\/p>\n<\/td>\n

\n

7,33<\/p>\n<\/td>\n<\/tr>\n

X\u1edbi<\/td>\n\n

7,89<\/p>\n<\/td>\n

\n

7,20<\/p>\n<\/td>\n

\n

9,30<\/p>\n<\/td>\n

\n

7,30<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

3.5. So s\u00e1nh sinh tr\u01b0\u1edfng c\u1ee7a Keo tai t\u01b0\u1ee3ng t\u00e1i sinh sau khai th\u00e1c v\u00e0 tr\u1ed3ng b\u1eb1ng c\u00e2y con c\u00f3 b\u1ea7u<\/h2>\n

Sau 3 n\u0103m th\u00ed nghi\u1ec7m, sinh tr\u01b0\u1edfng c\u1ee7a Keo tai t\u01b0\u1ee3ng \u0111\u01b0\u1ee3c tr\u1ed3ng t\u1eeb b\u1eb1ng c\u00e1c xu\u1ea5t x\u1ee9 v\u00e0 ph\u01b0\u01a1ng ph\u00e1p t\u1ea1o r\u1eebng kh\u00e1c nhau \u0111\u01b0\u1ee3c th\u1ec3 hi\u1ec7n trong b\u1ea3ng 3.2.<\/p>\n

B\u1ea3ng 3.2. Sinh tr\u01b0\u1edfng \u0111\u01b0\u1eddng k\u00ednh v\u00e0 chi\u1ec1u cao c\u1ee7a r\u1eebng Keo tai t\u01b0\u1ee3ng t\u00e1i sinh v\u00e0 r\u1eebng tr\u1ed3ng b\u1eb1ng c\u00e2y con c\u00f3 b\u1ea7u<\/b> t\u1ea1i Tuy\u00ean Quang v\u00e0 Y\u00ean B\u00e1i<\/b><\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n
\u0110\u1ecba \u0111i\u1ec3m<\/b><\/td>\n\n

Ch\u1ec9 ti\u00eau<\/b><\/p>\n

sinh tr\u01b0\u1edfng<\/b><\/p>\n<\/td>\n

Lo\u1ea1i r\u1eebng<\/b><\/td>\nTrung b\u00ecnh<\/b><\/td>\nP<\/b><\/td>\n<\/tr>\n
Tuy\u00ean Quang<\/td>\n\n

D1.3<\/sub> (cm)<\/p>\n<\/td>\n

R\u1eebng t\u00e1i sinh<\/td>\n\n

8,08a<\/sup><\/p>\n<\/td>\n

0,010<\/td>\n<\/tr>\n
R\u1eebng tr\u1ed3ng<\/td>\n\n

10,10b<\/sup><\/p>\n<\/td>\n<\/tr>\n

\n

Hvn (m)<\/p>\n<\/td>\n

R\u1eebng t\u00e1i sinh<\/td>\n\n

7,44i<\/sup><\/p>\n<\/td>\n

0,001<\/td>\n<\/tr>\n
R\u1eebng tr\u1ed3ng<\/td>\n\n

8,36ii<\/sup><\/p>\n<\/td>\n<\/tr>\n

Y\u00ean B\u00e1i<\/td>\n\n

D1.3<\/sub> (cm)<\/p>\n<\/td>\n

R\u1eebng t\u00e1i sinh<\/td>\n\n

9,44a<\/sup><\/p>\n<\/td>\n

0,142<\/td>\n<\/tr>\n
R\u1eebng tr\u1ed3ng<\/td>\n\n

9,73a<\/sup><\/p>\n<\/td>\n<\/tr>\n

\n

Hvn (m)<\/p>\n<\/td>\n

R\u1eebng t\u00e1i sinh<\/td>\n\n

7,30i<\/sup><\/p>\n<\/td>\n

0,066<\/td>\n<\/tr>\n
R\u1eebng tr\u1ed3ng<\/td>\n\n

7,80i<\/sup><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Ghi ch\u00fa: <\/i>Ti\u00eau chu\u1ea9n d\u00f9ng \u0111\u1ec3 ki\u1ec3m tra l\u00e0 U c\u1ee7a Mann-Whitney v\u1edbi m\u1ee9c \u00fd ngh\u0129a \u03b1=0,05<\/p>\n

K\u1ebft qu\u1ea3 \u1edf b\u1ea3ng 3.2 cho th\u1ea5y, sinh tr\u01b0\u1edfng c\u1ee7a r\u1eebng tr\u1ed3ng \u1edf c\u1ea3 2 n\u01a1i \u0111\u1ec1u cho t\u1ed1t h\u01a1n so v\u1edbi sinh tr\u01b0\u1edfng c\u1ee7a r\u1eebng t\u00e1i sinh. Tuy nhi\u00ean, \u1edf Y\u00ean B\u00e1i, c\u00e1c ch\u1ec9 ti\u00eau n\u00e0y ch\u01b0a kh\u00e1c nhau r\u00f5 r\u1ec7t v\u1ec1 m\u1eb7t th\u1ed1ng k\u00ea.<\/p>\n

\u00a0<\/b><\/p>\n

IV. K\u1ebeT LU\u1eacN T\u1ed2N T\u1ea0I V\u00c0 KI\u1ebeN NGH\u1eca<\/b><\/p>\n

4.1. K\u1ebft lu\u1eadn<\/h2>\n

– Keo tai t\u01b0\u1ee3ng t\u00e1i sinh xu\u1ea5t hi\u1ec7n h\u1ea7u h\u1ebft \u1edf c\u00e1c \u0111\u1ecba ph\u01b0\u01a1ng trong v\u00f9ng nghi\u00ean c\u1ee9u, Keo tai t\u01b0\u1ee3ng t\u00e1i sinh c\u00f3 \u0111\u1ed9 tu\u1ed5i cao nh\u1ea5t l\u00e0 10 tu\u1ed5i t\u1ea1i L\u00e2m tr\u01b0\u1eddng Y\u00ean B\u00ecnh, Y\u00ean B\u00e1i v\u00e0o n\u0103m 2007.<\/p>\n

– M\u1eadt \u0111\u1ed9 c\u00e2y t\u00e1i sinh t\u1ea1i n\u01a1i ch\u01b0a t\u1ec9a th\u01b0a \u0111\u1ea1t t\u1eeb 180.000 – 370.000 c\u00e2y\/ha. Tuy nhi\u00ean nh\u1eefng n\u01a1i t\u1ec9a th\u01b0a v\u1eabn \u0111\u1ec3 t\u1eeb 1.100 4.000 c\u00e2y\/ha khi c\u00e2y \u1edf tu\u1ed5i 4.<\/p>\n

– Sau 6 n\u0103m, t\u0103ng tr\u01b0\u1edfng trung b\u00ecnh c\u1ee7a c\u00e2y t\u00e1i sinh \u0111\u1ea1t c\u1ee7a \u0111\u01b0\u1eddng k\u00ednh \u0111\u1ea1t 2,2 cm\/n\u0103m v\u00e0 t\u0103ng tr\u01b0\u1edfng chi\u1ec1u cao \u0111\u1ea1t 1,9 m\/n\u0103m. Trong c\u00e1c n\u0103m t\u1eeb th\u1ee9 2 \u0111\u1ebfn n\u0103m th\u1ee9 4, t\u0103ng tr\u01b0\u1edfng \u0111\u01b0\u1eddng k\u00ednh \u0111\u1ea1t t\u1eeb 2,6 – 3,2 cm\/n\u0103m v\u00e0 chi\u1ec1u cao \u0111\u1ea1t t\u1eeb 1,9 – 2,6 m\/n\u0103m.<\/p>\n

– <\/i>Keo tai t\u01b0\u1ee3ng b\u1eaft \u0111\u1ea7u ra hoa t\u1eeb tu\u1ed5i 4. Hoa b\u1eaft \u0111\u1ea7u xu\u1ea5t hi\u1ec7n t\u1eeb \u0111\u1ea7u th\u00e1ng 9 v\u00e0 k\u00e9o d\u00e0i sang th\u00e1ng 10. Qu\u1ea3 ch\u00edn v\u00e0o th\u00e1ng 4 – 5 n\u0103m sau, s\u1ef1 ch\u00eanh l\u1ec7ch v\u1ec1 th\u1eddi gian ra hoa, k\u1ebft qu\u1ea3 \u1edf c\u00e1c \u0111\u1ecba ph\u01b0\u01a1ng kh\u00e1c nhau v\u00e0 gi\u1eefa c\u00e1c n\u0103m kh\u00e1c nhau l\u00e0 kh\u00f4ng nhi\u1ec1u (kho\u1ea3ng 15 – 20 ng\u00e0y).<\/p>\n

– K\u1ebft qu\u1ea3 \u0111i\u1ec1u tra s\u1ea3n l\u01b0\u1ee3ng h\u1ea1t gi\u1ed1ng tr\u00ean c\u00e2y ti\u00eau chu\u1ea9n Keo tai t\u01b0\u1ee3ng dao \u0111\u1ed9ng t\u1eeb 21.000 \u0111\u1ebfn 51.259 h\u1ea1t. M\u1ed7i c\u00e2y c\u00f3 th\u1ec3 cho t\u1eeb 0,23 – 0,57 kg h\u1ea1t\/n\u0103m.<\/p>\n

– S\u1ed1 l\u01b0\u1ee3ng h\u1ea1t trong \u0111\u1ea5t d\u01b0\u1edbi t\u00e1n r\u1eebng Keo tai t\u01b0\u1ee3ng \u0111\u1ea1t trung b\u00ecnh\u00a0 t\u1eeb 52,7 – 120,6 h\u1ea1t\/m2 <\/sup>(t\u01b0\u01a1ng \u0111\u01b0\u01a1ng trung b\u00ecnh 93.050.000 h\u1ea1t\/ha) \u1edf Tuy\u00ean Quang) v\u00e0 t\u1eeb 29,2 – 49,2 h\u1ea1t\/m2<\/sup> (t\u01b0\u01a1ng \u0111\u01b0\u01a1ng trung b\u00ecnh 40.560.000 h\u1ea1t\/ha) \u1edf Y\u00ean B\u00e1i<\/p>\n

– M\u1eadt \u0111\u1ed9 c\u00e2y t\u00e1i sinh c\u1ee7a Keo tai t\u01b0\u1ee3ng b\u1ecb \u1ea3nh h\u01b0\u1edfng r\u00f5 r\u1ec7t b\u1edfi c\u1ea3 3 nh\u00e2n t\u1ed1 \u0111\u1ed9 d\u1ed1c, bi\u1ec7n ph\u00e1p x\u1eed l\u00fd th\u1ef1c b\u00ec v\u00e0 l\u00e0m \u0111\u1ea5t:<\/p>\n

(a) \u0110\u1ed1i v\u1edbi \u0111\u1ed9 d\u1ed1c, t\u1ea1i Tuy\u00ean Quang, c\u1ea5p \u0111\u1ed9 d\u1ed1c 26-35o<\/sup> s\u1ed1 c\u00e2y t\u00e1i sinh trung b\u00ecnh \u0111\u1ea1t l\u1edbn nh\u1ea5t (1.518.854 c\u00e2y\/ha) v\u00e0 th\u1ea5p nh\u1ea5t l\u00e0 \u1edf c\u1ea5p \u0111\u1ed9 d\u1ed1c < 15o<\/sup> (953.541 c\u00e2y\/ha). \u1ede Y\u00ean B\u00e1i, c\u1ea5p \u0111\u1ed9 d\u1ed1c <15O<\/sup> cho s\u1ed1 h\u1ea1t n\u1ea3y m\u1ea7m cao nh\u1ea5t v\u1edbi 371.666 h\u1ea1t\/ha v\u00e0 nh\u1ecf nh\u1ea5t \u1edf c\u1ea5p \u0111\u1ed9 d\u1ed1c >35o<\/sup> v\u1edbi 86.666 h\u1ea1t\/ha).<\/p>\n

(b) X\u1eed l\u00fd th\u1ef1c b\u00ec b\u1eb1ng\u00a0 c\u00e1ch gom th\u00e0nh h\u00e0ng v\u00e0 \u0111\u1ed1t cho s\u1ed1 l\u01b0\u1ee3ng c\u00e2y t\u00e1i sinh cao h\u01a1n (\u1edf Tuy\u00ean Quang \u0111\u1ea1t trung b\u00ecnh 1.281.302 c\u00e2y\/ha v\u00e0 Y\u00ean B\u00e1i \u0111\u1ea1t 227.760 h\u1ea1t\/ha) so v\u1edbi th\u00ed nghi\u1ec7m r\u1ea3i th\u1ef1c b\u00ec \u0111\u1ec1u v\u00e0 \u0111\u1ed1t (\u1edf Tuy\u00ean Quang \u0111\u1ea1t 1.089.583 h\u1ea1t\/ha, \u1edf Y\u00ean B\u00e1i \u0111\u1ea1t 169.761 h\u1ea1t\/ha)\u00a0 ph\u01b0\u01a1ng th\u1ee9c r\u1ea3i \u0111\u1ec1u tr\u00ean di\u1ec7n t\u00edch v\u00e0 \u0111\u1ed1t (\u0111\u1ea1t trung b\u00ecnh 109 c\u00e2y\/m2<\/sup>).<\/p>\n

(c) Ph\u01b0\u01a1ng th\u1ee9c x\u1edbi \u0111\u1ea5t cho k\u1ebft qu\u1ea3 h\u1ea1t n\u1ea3y m\u1ea7m cao h\u01a1n so v\u1edbi kh\u00f4ng x\u1edbi \u0111\u1ea5t. Trung b\u00ecnh th\u00ed nghi\u1ec7m x\u1edbi \u0111\u1ea5t t\u1ea1i Tuy\u00ean Quang \u0111\u1ea1t 1.337.031 c\u00e2y\/ha v\u00e0 kh\u00f4ng x\u1edbi l\u00e0 1.033.854 c\u00e2y\/ha) ph\u01b0\u01a1ng th\u1ee9c kh\u00f4ng x\u1edbi \u0111\u1ea5t (\u0111\u1ea1t 103 c\u00e2y\/m2<\/sup>. \u1ede Y\u00ean B\u00e1i \u0111\u1ea1t 207.797 h\u1ea1t \u0111\u1ed1i v\u1edbi th\u00ed nghi\u1ec7m x\u1edbi \u0111\u1ea5t v\u00e0 194.479 h\u1ea1t\/ha \u0111\u1ed1i v\u1edbi th\u00ed nghi\u1ec7m kh\u00f4ng x\u1edbi.<\/p>\n

4.2. Khuy\u1ebfn ngh\u1ecb<\/b><\/p>\n

C\u1ea7n b\u1ea3o v\u1ec7 khu v\u1ef1c th\u00ed nghi\u1ec7m v\u00e0 ti\u1ebfp t\u1ee5c theo d\u00f5i c\u00e1c th\u00ed nghi\u1ec7m \u0111\u1ebfn khi r\u1eebng c\u00f3 th\u1ec3 khai th\u00e1c \u0111\u1ec3 c\u00f3 th\u1ec3 \u0111\u00e1nh gi\u00e1 c\u1ee5 th\u1ec3 \u1ea3nh h\u01b0\u1edfng c\u1ee7a c\u00e1c bi\u1ec7n ph\u00e1p l\u00e2m sinh \u0111\u1ebfn sinh tr\u01b0\u1edfng c\u1ee7a Keo tai t\u01b0\u1ee3ng t\u00e1i sinh sau khai th\u00e1c.<\/p>\n

T\u00c0I LI\u1ec6U THAM KH\u1ea2O CH\u00cdNH<\/b><\/p>\n

    \n
  1. Ki\u1ec1u Thanh T\u1ecbnh. 2005. B\u00e1o c\u00e1o \u0111\u1ec1 t\u00e0i: Nghi\u00ean c\u1ee9u k\u1ef9 thu\u1eadt x\u00fac ti\u1ebfn t\u00e1i sinh t\u1ef1 nhi\u00ean v\u00e0 nu\u00f4i d\u01b0\u1ee1ng r\u1eebng keo tai t\u01b0\u1ee3ng (Acacia mangium)sau khai th\u00e1c \u1edf v\u00f9ng \u0110\u00f4ng Nam B\u1ed9.<\/i><\/li>\n
  2. L\u00ea \u0110\u00ecnh Kh\u1ea3. Nh\u00e2n gi\u1ed1ng Keo l\u00e1 tr\u00e0m v\u00e0 Keo tai t\u01b0\u1ee3ng.<\/i> K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u v\u1ec1 ch\u1ecdn gi\u1ed1ng c\u00e2y r\u1eebng. T\u1eadp 2 Nh\u00e0 xu\u1ea5t b\u1ea3n N\u00f4ng nghi\u1ec7p H\u00e0 N\u1ed9i, 1997.<\/li>\n
  3. Nguy\u1ec5n Xu\u00e2n Qu\u00e1t, Nguy\u1ec5n H\u1ed3ng Qu\u00e2n, Ph\u1ea1m Quang Minh v\u00e0 Ph\u1ea1m Xu\u00e2n Nam. 2004. Nghi\u00ean c\u1ee9u chuy\u00ean \u0111\u1ec1 t\u00e1i sinh Keo l\u00e1 tr\u00e0m v\u00e0 Keo tai t\u01b0\u1ee3ng khu v\u1ef1c ph\u00eda B\u1eafc Vi\u1ec7t Nam.<\/i><\/li>\n
  4. Hutacharern C. 1993. Insect pests. In: Awang K, Taylor D, eds. Acacia mangium Growing and Utilisation<\/i>. MPTS Monograph Series No. 3. Bangkok: Winrock International and FAO, 163-202.<\/li>\n
  5. Hutacharern. 1989. Survey of forest insect pests of multipurpose tree species<\/i>; Mimeograph, Bangkok, FRD. Thailand.<\/li>\n
  6. Mead D.J, Miller R.R. 1991. The establishment and tending of Acacia mangium. <\/i>In: Turnbull J.W, ed. Advances in Tropical Acacia Research. Proceedings of an International Workshop hold in Bangkok, Thailand.<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"

    \u0110\u1ec1 t\u00e0i: \u201cNghi\u00ean c\u1ee9u h\u1ec7 th\u1ed1ng c\u00e1c bi\u1ec7n ph\u00e1p k\u1ef9 thu\u1eadt l\u00e2m sinh \u0111\u1ec3 x\u00fac ti\u1ebfn t\u00e1i sinh r\u1eebng Keo tai t\u01b0\u1ee3ng (Acacia mamgium Willd) nh\u1eb1m n\u00e2ng cao n\u0103ng su\u1ea5t v\u00e0 hi\u1ec7u qu\u1ea3 kinh t\u1ebf c\u1ee7a tr\u1ed3ng r\u1eebng c\u00f4ng nghi\u1ec7p \u1edf c\u00e1c t\u1ec9nh mi\u1ec1n n\u00fai ph\u00eda B\u1eafc\u201d \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n nh\u1eb1m \u0111\u00e1nh gi\u00e1 kh\u1ea3 n\u0103ng […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[21,72],"tags":[],"_links":{"self":[{"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/14972"}],"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\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/comments?post=14972"}],"version-history":[{"count":1,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/14972\/revisions"}],"predecessor-version":[{"id":14974,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/14972\/revisions\/14974"}],"wp:attachment":[{"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/media?parent=14972"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/categories?post=14972"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/tags?post=14972"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}