{"id":12906,"date":"2014-05-14T15:46:53","date_gmt":"2014-05-14T08:46:53","guid":{"rendered":"http:\/\/vafs.gov.vn\/vn\/?p=12906"},"modified":"2014-05-14T15:48:13","modified_gmt":"2014-05-14T08:48:13","slug":"ky-thuat-trong-duoc-doi","status":"publish","type":"post","link":"https:\/\/vafs.gov.vn\/vn\/ky-thuat-trong-duoc-doi\/","title":{"rendered":"K\u1ef9 thu\u1eadt tr\u1ed3ng \u0110\u01b0\u1edbc \u0111\u00f4i"},"content":{"rendered":"

\u0110\u01af\u01a0\u0301C \u0110\u00d4I<\/b><\/p>\n

T\u00ean kh\u00e1c: \u0110\u01b0\u1edbc<\/p>\n

\u00a0T\u00ean khoa h\u1ecdc:\u00a0\u00a0\u00a0\u00a0\u00a0 Rhizophora apiculata<\/i> BL.<\/p>\n

H\u1ecd th\u1ef1c v\u1eadt: \u0110\u01b0\u1edbc (Rhizophoraceae)<\/p>\n

(Ngu\u1ed3n ch\u00ednh: Ng\u00f4 \u0110\u00ecnh Qu\u1ebf, 2010)<\/em><\/p>\n

1. \u0110\u0103\u0323c \u0111i\u00ea\u0309m hi\u0300nh tha\u0301i<\/b><\/p>\n

L\u00e0 lo\u00e0i c\u00e2y g\u1ed7 ng\u1eadp m\u1eb7n th\u01b0\u1eddng xanh, c\u00e2y c\u00f3 th\u1ec3 cao t\u1edbi 30 m, \u0111\u01b0\u1eddng k\u00ednh \u0111\u1ebfn 0,7m. Th\u00e2n tr\u00f2n th\u1eb3ng, v\u1edbi v\u00e0i \u0111\u00f4i c\u1eb7p m\u1ea5u c\u00e0nh n\u1eb1m c\u00e1ch \u0111\u1ec1u nhau kho\u1ea3ng 0,5-0,7m, t\u00e1n l\u00e1 xanh \u0111\u1eadm, r\u1ec5 ch\u00e2n n\u01a1m cao t\u1edbi 3 m, v\u1ecf c\u00e2y m\u1ea7u x\u00e1m n\u00e2u \u0111\u1ebfn n\u00e2u \u0111en v\u1edbi nhi\u1ec1u v\u1ebft n\u1ee9t d\u00e0i.<\/p>\n

L\u00e1 \u0111\u01a1n m\u1ecdc \u0111\u1ed1i, h\u00ecnh b\u1ea7u d\u1ee5c d\u00e0i 10-15cm, r\u1ed9ng 4-6cm, g\u1ed1c l\u00e1 h\u00ecnh n\u00eam, \u0111\u1ea7u nh\u1ecdn, m\u1eb7t d\u01b0\u1edbi c\u00f3 nhi\u1ec1u ch\u1ea5m \u0111en, g\u00e2n ch\u00ednh n\u1ed5i r\u00f5 \u1edf m\u1eb7t d\u01b0\u1edbi, g\u00e2n ph\u1ee5 kh\u00f4ng r\u00f5, cu\u1ed1ng l\u00e1 d\u00e0i 1,5-2cm, l\u00e1 k\u00e8m h\u00ecnh b\u00fap d\u00e0i 4- 8 cm r\u1ee5ng s\u1edbm.<\/p>\n

Hoa nh\u1ecf, m\u1ea7u v\u00e0ng nh\u1ea1t t\u1ea1o th\u00e0nh t\u1ee5 t\u00e1n 2 \u0111\u1ebfn 4 b\u1ed1n b\u00f4ng tr\u00ean m\u1ed9t cu\u1ed1ng d\u00e0i 0,5-1cm, m\u1ecdc t\u1eeb n\u00e1ch l\u00e1.<\/p>\n

Qu\u1ea3 h\u00ecnh tr\u00e1i l\u00ea ng\u01b0\u1ee3c, d\u00e0i 2-2,5 cm, v\u1ecf ngo\u00e0i m\u1ea7u n\u00e2u, nh\u00e1m v\u1edbi 2 tay \u0111\u00e0i c\u00f2n l\u1ea1i m\u1ea7u v\u00e0ng hay \u0111\u1ecf nh\u1ea1t khi ch\u00edn ch\u1ee9a m\u1ed9t h\u1ea1t kh\u00f4ng ph\u00f4i nh\u0169, h\u1ea1t n\u1ea9y m\u1ea7m tr\u00ean th\u00e2n c\u00e2y m\u1eb9 cho ra c\u00e2y m\u1ea7m d\u00e0i 15-25cm, c\u00f2n g\u1ecdi l\u00e0 tr\u1ee5 m\u1ea7m.<\/p>\n

\u1ede C\u00e0 Mau \u0110\u01b0\u1edbc \u0111\u00f4i ra hoa t\u1eeb th\u00e1ng 11 \u0111\u1ebfn th\u00e1ng 1, qu\u1ea3 ch\u00edn v\u00e0o th\u00e1ng 7 \u0111\u1ebfn th\u00e1ng 9.<\/p>\n

\"\u0110uoc<\/a><\/p>\n

2. \u0110\u0103\u0323c ti\u0301nh sinh tha\u0301i<\/b><\/p>\n

\u1ede Vi\u1ec7t Nam, \u0110\u01b0\u1edbc \u0111\u00f4i ph\u00e2n b\u1ed1 t\u1ef1 nhi\u00ean tr\u00ean di\u1ec7n r\u1ed9ng t\u1eeb Qu\u1ea3ng Tr\u1ecb \u0111\u1ebfn \u0110\u1ed3ng b\u1eb1ng S\u00f4ng C\u1eedu Long, nh\u01b0ng ph\u00e1t tri\u1ec3n m\u1ea1nh nh\u1ea5t \u1edf b\u00e1n \u0111\u1ea3o C\u00e0 Mau, t\u1eeb v\u0129 \u0111\u1ed9 8\u00ba50\u2019 \u0111\u1ebfn 9\u00ba20\u2019 B\u1eafc, nhi\u1ec7t \u0111\u1ed9 kh\u00f4ng kh\u00ed trung b\u00ecnh n\u0103m 26,5\u00baC. Trong n\u0103m kh\u00f4ng c\u00f3 th\u00e1ng l\u1ea1nh (nhi\u1ec7t \u0111\u1ed9 kh\u00f4ng kh\u00ed <20\u00baC), nhi\u1ec7t \u0111\u1ed9 c\u1ee7a n\u01b0\u1edbc bi\u1ec3n quanh n\u0103m lu\u00f4n \u226525\u00baC. L\u01b0\u1ee3ng m\u01b0a kh\u00e1 cao t\u1eeb 2500- 2800mm\/n\u0103m.<\/p>\n

3. Gi\u00f4\u0301ng va\u0300 ta\u0323o c\u00e2y con<\/b><\/p>\n

V\u01b0\u1eddn \u01b0\u01a1m ph\u1ea3i g\u1ea7n n\u01a1i tr\u1ed3ng r\u1eebng v\u00e0 thu\u1eadn l\u1ee3i cho vi\u1ec7c v\u1eadn chuy\u1ec3n c\u00e2y con. V\u01b0\u1eddn \u01b0\u01a1m b\u1ed1 tr\u00ed v\u00e0 l\u1ef1a ch\u1ecdn c\u1ea9n th\u1eadn \u1edf n\u01a1i ng\u1eadp tri\u1ec1u trung b\u00ecnh trong n\u0103m, c\u00f3 b\u1edd bao xung quanh \u0111\u1ec3 b\u1ea3o v\u1ec7. V\u01b0\u1eddn ph\u1ea3i \u0111\u1eb7t xa n\u01a1i ngu\u1ed3n b\u1ec7nh v\u00e0 t\u00e1ch r\u1eddi xa khu canh t\u00e1c n\u00f4ng nghi\u1ec7p, n\u01a1i ch\u0103n th\u1ea3 gia s\u00fac, tr\u00e1nh n\u01a1i thu\u1ef7 tri\u1ec1u r\u00fat qu\u00e1 nhanh, n\u01a1i hay b\u1ecb ph\u00f9 sa b\u1ed3i l\u1eafng.<\/p>\n

Qu\u1ea3 \u0110\u01b0\u1edbc \u0111\u01b0\u1ee3c thu gom t\u1eeb nh\u1eefng r\u1eebng \u0110\u01b0\u1edbc sinh tr\u01b0\u1edfng t\u1ed1t, c\u00f3 tu\u1ed5i t\u1eeb 10-30, c\u00e2y c\u00f3 \u0111\u01b0\u1eddng k\u00ednh 8- 20cm v\u00e0 chi\u1ec1u cao tr\u00ean 12m, sinh tr\u01b0\u1edfng kho\u1ebb m\u1ea1nh kh\u00f4ng b\u1ecb s\u00e2u b\u1ec7nh. Qu\u1ea3 \u0110\u01b0\u1edbc bao g\u1ed3m c\u1ea3 tr\u1ee5 m\u1ea7m b\u1eaft \u0111\u1ea7u ch\u00edn t\u1eeb th\u00e1ng 7- th\u00e1ng 12, nh\u01b0ng th\u1eddi gian thu v\u1edbt qu\u1ea3 \u0111\u01b0\u1edbc t\u1ed1t nh\u1ea5t t\u1eeb th\u00e1ng 7 \u0111\u1ebfn th\u00e1ng 9 d\u01b0\u01a1ng l\u1ecbch (th\u1eddi gian sau qu\u1ea3 \u0111\u01b0\u1edbc b\u1ecb s\u00e2u nhi\u1ec1u).<\/p>\n

Thu l\u01b0\u1ee3m qu\u1ea3 ch\u00edn tr\u00ean m\u1eb7t n\u01b0\u1edbc, khi thu\u1ef7 tri\u1ec1u \u0111\u01b0a ra bi\u1ec3n r\u1ed3i d\u1ea1t v\u00e0o nh\u1eefng b\u1edd bi\u1ec3n thoai tho\u1ea3i ho\u1eb7c thu h\u00e1i tr\u1ef1c ti\u1ebfp t\u1eeb c\u00e2y m\u1eb9 b\u1eb1ng c\u00e1ch rung cho qu\u1ea3\u00a0 r\u1ee5ng xu\u1ed1ng. Qu\u1ea3 l\u1ea5y gi\u1ed1ng ph\u1ea3i c\u00f2n nguy\u00ean v\u1eb9n, kh\u00f4ng c\u00f3 r\u1ec5 \u1edf tr\u1ee5 m\u1ea7m, kh\u00f4ng b\u1ecb s\u00e2u h\u1ea1i. Qu\u1ea3 d\u00e0i 20- 25 cm. M\u1ed7i kg ch\u1ee9a kho\u1ea3ng 40 qu\u1ea3.<\/p>\n

Qu\u1ea3 sau khi thu h\u00e1i v\u1ec1 ph\u1ea3i ti\u1ebfn h\u00e0nh ph\u00e2n lo\u1ea1i. Lo\u1ea1i b\u1ecf nh\u1eefng qu\u1ea3 c\u00f2n non, nh\u1eefng qu\u1ea3 b\u1ecb s\u00e2u b\u1ec7nh, b\u1ecb c\u00e1y, c\u00f2ng c\u1eafn ngang th\u00e2n. Qu\u1ea3 gi\u1ea3m t\u1ef7 l\u1ec7 n\u1ea3y m\u1ea7m r\u1ea5t nhanh khi \u1edf \u0111i\u1ec1u ki\u1ec7n b\u00ecnh th\u01b0\u1eddng, do \u0111\u00f3 sau khi thu h\u00e1i v\u1ec1 ph\u1ea3i c\u1ea5y v\u00e0o b\u1ea7u ngay, khi kh\u00f4ng c\u1ea5y k\u1ecbp th\u1eddi c\u1ea7n b\u1ea3o qu\u1ea3n b\u1eb1ng c\u00e1ch: \u0111\u1ec3 qu\u1ea3 gi\u1ed1ng \u1edf n\u01a1i c\u00f3 d\u00f2ng n\u01b0\u1edbc ch\u1ea3y, d\u01b0\u1edbi b\u00f3ng r\u00e2m; n\u1ebfu \u0111\u1ec3 \u1edf n\u01a1i kh\u00f4 r\u00e1o, th\u00ec ph\u1ea3i r\u1ea3i \u0111\u1ec1u th\u00e0nh m\u1ed9t l\u1edbp m\u1ecfng, d\u00e0y kh\u00f4ng qu\u00e1 20 cm, m\u1ed7i ng\u00e0y ph\u1ea3i t\u01b0\u1edbi n\u01b0\u1edbc 2 l\u1ea7n cho qu\u1ea3 \u0110\u01b0\u1edbc gi\u1ed1ng, m\u1ed9t l\u1ea7n v\u00e0o s\u00e1ng s\u1edbm, m\u1ed9t l\u1ea7n v\u00e0o bu\u1ed5i chi\u1ec1u. Th\u1eddi gian b\u1ea3o qu\u1ea3n kh\u00f4ng qu\u00e1 15 ng\u00e0y.<\/b><\/p>\n

D\u00f9ng v\u1ecf b\u1ea7u Polyetylen m\u1ea7u tr\u1eafng \u0111\u1ee5c hay \u0111en, b\u1ea3o \u0111\u1ea3m \u0111\u1ed9 b\u1ec1n cao \u0111\u1ec3 khi \u0111\u00f3ng b\u1ea7u, ch\u1ecbu \u0111\u01b0\u1ee3c ng\u00e2m trong n\u01b0\u1edbc bi\u1ec3n ho\u1eb7c qu\u00e1 tr\u00ecnh ch\u0103m s\u00f3c v\u1eadn chuy\u1ec3n c\u00e2y con \u0111i tr\u1ed3ng r\u1eebng kh\u00f4ng b\u1ecb h\u01b0 h\u1ecfng.<\/p>\n

T\u00fai b\u1ea7u c\u00f3 \u0111\u00e1y, \u0111\u01b0\u1eddng k\u00ednh 15cm, cao 20cm, \u0111\u1ee5c c\u00e1c l\u1ed7 nh\u1ecf c\u00f3 \u0111\u01b0\u1eddng k\u00ednh 0,5cm xung quanh \u0111\u1ec3 tho\u00e1t n\u01b0\u1edbc.<\/p>\n

S\u1eed d\u1ee5ng 95% lo\u1ea1i \u0111\u1ea5t c\u00e1t pha ng\u1eadp thu\u1ef7 tri\u1ec1u h\u00e0ng ng\u00e0y \u0111\u1ec3 \u0111\u00f3ng b\u1ea7u (\u0111\u1ea5t \u0111\u01b0\u1ee3c l\u1ea5y \u1edf t\u1ea7ng m\u1eb7t c\u00f3 \u0111\u1ed9 s\u00e2u 0- 20cm, pH= 6,5- 7,0; t\u1ed5ng mu\u1ed1i tan 1-2%. Tr\u1ed9n \u00a03% supe l\u00e2n L\u00e2m Thao v\u1edbi 1-2% ph\u00e2n b\u00f2 kh\u00f4 t\u00ednh theo tr\u1ecdng l\u01b0\u1ee3ng b\u1ea7u.<\/p>\n

Trang m\u1eb7t lu\u1ed1ng cho ph\u1eb3ng, nh\u1eb7t s\u1ea1ch c\u1ecf. K\u00edch th\u01b0\u1edbc lu\u1ed1ng \u0111\u1eb7t b\u1ea7u 1,0m x1,0m hai lu\u1ed1ng c\u00e1ch nhau 50cm, c\u00f3 r\u00e3nh tho\u00e1t n\u01b0\u1edbc khi th\u1ee7y tri\u1ec1u r\u00fat.<\/p>\n

X\u1ebfp b\u1ea7u theo h\u00e0ng, c\u1ee9 hai h\u00e0ng \u0111\u1ec3 c\u00e1ch m\u1ed9t h\u00e0ng, l\u1ea5p \u0111\u1ea5t xung quanh lu\u1ed1ng \u0111\u1ec3 gi\u1eef b\u1ea7u.<\/p>\n

T\u1eeb th\u00e1ng th\u1ee9 hai c\u1ee9 2 th\u00e1ng \u0111\u1ea3o b\u1ea7u m\u1ed9t l\u1ea7n, b\u1eb1ng c\u00e1ch d\u1ecbch chuy\u1ec3n b\u1ea7u \u0111\u1ec3 tr\u00e1nh r\u1ec5 c\u1eafm s\u00e2u v\u00e0o \u0111\u1ea5t. Ti\u1ebfn h\u00e0nh \u0111\u1ea3o b\u1ea7u k\u1ebft h\u1ee3p v\u1edbi\u00a0 ph\u00e2n lo\u1ea1i c\u00e2y v\u00e0o th\u1eddi gian thu\u1ef7 tri\u1ec1u r\u00fat.<\/p>\n

Tr\u1ee5 m\u1ea7m c\u1ea5y tr\u1ef1c ti\u1ebfp 1\/3 chi\u1ec1u d\u00e0i (5-7cm) v\u00e0o b\u1ea7u \u0111\u1ea5t. M\u1ed7i b\u1ea7u ch\u1ec9 c\u1ea5y 1 qu\u1ea3. C\u1ea5y qu\u1ea3 v\u00e0o ng\u00e0y r\u00e2m m\u00e1t, tr\u00e1nh ng\u00e0y m\u01b0a b\u00e3o<\/p>\n

H\u00e0ng ng\u00e0y g\u1ee1 b\u1ecf rong, r\u00eau, v\u1eadt c\u1ea3n b\u00e1m v\u00e0o qu\u1ea3. Sau khi c\u1ea5y qu\u1ea3 th\u01b0\u1eddng b\u1ecb m\u1ed9t s\u1ed1 lo\u00e0i gi\u00e1p x\u00e1c, th\u00e2n m\u1ec1m, ch\u00e2n b\u1ee5ng, cua c\u00f2ng, \u1ed1c bi\u1ec3n, h\u00e0 sun\u2026t\u1ea5n c\u00f4ng. V\u00ec v\u1eady, th\u01b0\u1eddng xuy\u00ean theo d\u00f5i b\u1eaft b\u1ecf c\u00e1c lo\u00e0i \u0111\u1ed9ng v\u1eadt n\u00e0y \u0111\u1ec1 ph\u00f2ng c\u1eafn n\u00e1t tr\u1ee5 m\u1ea7m.<\/p>\n

\u0110\u1ea5t th\u00edch h\u1ee3p cho tr\u1ed3ng r\u1eebng \u0111\u01b0\u1edbc l\u00e0 \u0111\u1ea5t ph\u00f9 sa ng\u1eadp m\u1eb7n, ho\u1eb7c \u0111\u1ea5t ph\u00f9 sa ng\u1eadp m\u1eb7n ph\u00e8n ti\u1ec1m t\u00e0ng, d\u1ea1ng tr\u1ea7m t\u00edch gi\u1ea7u b\u00f9n, c\u00e1t ph\u1ea5n v\u00e0 s\u00e9t. \u0110\u1ea5t c\u00f3 \u0111\u1ed9 th\u00e0nh th\u1ee5c t\u1eeb d\u1ea1ng b\u00f9n ch\u1eb7t \u0111\u1ebfn s\u00e9t m\u1ec1m v\u00e0 s\u00e9t, th\u00edch h\u1ee3p nh\u1ea5t l\u00e0 d\u1ea1ng \u0111\u1ea5t s\u00e9t m\u1ec1m (ch\u00e2n \u0111i l\u00fan s\u00e2u t\u1eeb 5- 30 cm, th\u00edch h\u1ee3p nh\u1ea5t l\u00e0 15- 20cm). \u0110\u1ea5t ng\u1eadp tri\u1ec1u khi tri\u1ec1u cao trung b\u00ecnh v\u00e0 s\u1ed1 gi\u1edd ng\u1eadp n\u01b0\u1edbc tri\u1ec1u 3- 4gi\u1edd\/ng\u00e0y.<\/p>\n

\u0110\u1ed9 m\u1eb7n n\u01b0\u1edbc bi\u1ec3n th\u00edch h\u1ee3p n\u01a1i tr\u1ed3ng r\u1eebng t\u1eeb 1-2%o. Tr\u00ean d\u1ea1ng \u0111\u1ea5t s\u00e9t r\u1eafn ch\u1eafc, \u0111i kh\u00f4ng l\u00fan m\u00e0 ch\u1ec9 ng\u1eadp n\u01b0\u1edbc khi thu\u1ef7 tri\u1ec1u cao b\u1ea5t th\u01b0\u1eddng hay \u0111\u1ea5t nhi\u1ec1u c\u00e1t, m\u1eb7t \u0111\u1ea5t c\u00f3 nhi\u1ec1u c\u1ecf ch\u1ecbu m\u1eb7n tr\u1ed3ng r\u1eebng c\u00e2y sinh tr\u01b0\u1edfng v\u00e0 ph\u00e1t tri\u1ec3n r\u1ea5t k\u00e9m.<\/p>\n

Tr\u1ed3ng thu\u1ea7n lo\u00e0i, b\u1ed1 tr\u00ed theo h\u00ecnh vu\u00f4ng hay nanh s\u1ea5u ho\u1eb7c tr\u1ed3ng h\u1ed7n lo\u00e0i v\u1edbi D\u00e0 qu\u00e1nh, \u0110\u01b0ng, M\u1eafm tr\u1eafng, V\u1eb9t.<\/p>\n

M\u1eadt \u0111\u1ed9 tr\u1ed3ng r\u1eebng thu\u1ea7n lo\u00e0i 10.000 c\u00e2y\/ha, c\u1ef1 ly 1,0m x 1,0m.<\/p>\n

Tr\u00ean \u0111\u1ea5t th\u00edch h\u1ee3p c\u00f3 th\u1ec3 tr\u1ed3ng v\u1edbi m\u1eadt \u0111\u1ed9 20.000 c\u00e2y\/ha. C\u1ef1 ly tr\u1ed3ng 0,7m x 0,7m.<\/p>\n

Tr\u1ed3ng b\u1eb1ng c\u00e2y con c\u00f3 b\u1ea7u v\u00e0o th\u00e1ng 7 \u0111\u1ebfn 15 th\u00e1ng 10 d\u01b0\u01a1ng l\u1ecbch, t\u1ed1t nh\u1ea5t l\u00e0 th\u00e1ng 7\u0111\u1ebfn th\u00e1ng 9 d\u01b0\u01a1ng l\u1ecbch.<\/p>\n

Tr\u1ed3ng c\u00e2y khi thu\u1ef7 tri\u1ec1u r\u00fat. D\u00f9ng d\u00e2y nilon th\u1eaft n\u00fat chia th\u00e0nh c\u00e1c \u0111o\u1ea1n 1m, k\u00e9o th\u1eb3ng h\u00e0ng \u0111\u1ec3 tr\u1ed3ng \u0111\u00fang kho\u1ea3ng c\u00e1ch. Bi\u1ec7n ph\u00e1p d\u1ec5 l\u00e0m nh\u1ea5t l\u00e0 d\u00f9ng m\u1ed9t \u0111o\u1ea1n tre b\u01b0\u01a1ng ho\u1eb7c lu\u1ed3ng d\u00e0i 3m, l\u1eafp r\u0103ng d\u00e0i 10cm v\u1edbi kho\u1ea3ng c\u00e1ch 1m x 1m (Gi\u1ed1ng nh\u01b0 m\u1ed9t c\u00e0o c\u1ecf). M\u1ed9t ng\u01b0\u1eddi c\u1ea7m c\u00e0o n\u00e0y k\u00e9o theo m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng tr\u00ean m\u1eb7t b\u00f9n. Sau \u0111\u00f3 l\u1ea1i d\u00f9ng c\u00e0o k\u00e9o theo chi\u1ec1u vu\u00f4ng g\u00f3c t\u1ea1o th\u00e0nh nh\u1eefng \u00f4 vu\u00f4ng th\u1eb3ng h\u00e0ng ngang d\u1ecdc.<\/p>\n

\u0110\u1ed1i v\u1edbi c\u00e2y c\u00f3 b\u1ea7u th\u00ec r\u1ea1ch b\u1ecf v\u1ecf b\u1ea7u tr\u01b0\u1edbc khi tr\u1ed3ng. Kh\u00f4ng l\u00e0m \u0111\u1ee9t r\u1ec5 \u0111\u1ec3 tr\u00e1nh x\u00e2m nh\u1eadp m\u1eb7n, c\u00e2y d\u1ec5 b\u1ecb ch\u1ebft.<\/p>\n

Trong 4 n\u0103m \u0111\u1ea7u khi r\u1eebng \u0111\u01b0\u1edbc ch\u01b0a kh\u00e9p t\u00e1n, ti\u1ebfn h\u00e0nh ch\u1eb7t b\u1ecf c\u00e1c c\u00e2y g\u1ed7 t\u1ea1p v\u00e0 th\u1ef1c b\u00ec t\u1ef1 nhi\u00ean m\u1ecdc xen l\u1eabn v\u1edbi r\u1eebng \u0111\u01b0\u1edbc (n\u1ebfu c\u00f3). T\u1eeb n\u0103m th\u1ee9 5 tr\u1edf \u0111i r\u1eebng \u0111\u01b0\u1edbc ho\u00e0n to\u00e0n kh\u00e9p t\u00e1n b\u1eaft \u0111\u1ea7u ti\u1ebfn h\u00e0nh t\u1ec9a th\u01b0a.<\/p>\n

Sau khi tr\u1ed3ng r\u1eebng t\u1eeb 2-6 th\u00e1ng, c\u1ea7n v\u1edbt b\u1ecf rong, r\u00eau, t\u1ea3o b\u00e1m tr\u00ean th\u00e2n, l\u00e1 n\u1ebfu c\u00f3 t\u1ea1o \u0111i\u1ec1u ki\u1ec7n cho c\u00e2y con quang h\u1ee3p t\u1ed1t.<\/p>\n

B\u1eaft cua, c\u00f2ng, \u1ed1c \u0103n l\u00e1 c\u00e2y. Khi ph\u00e1t hi\u1ec7n s\u00e2u non d\u00f9ng tay b\u1eaft gi\u1ebft, ho\u1eb7c rung c\u00e2y cho s\u00e2u r\u01a1i \u0111\u1ec3 gi\u1ebft.<\/p>\n

B\u1ea3o v\u1ec7 c\u00e1c lo\u00e0i k\u00fd sinh\u00a0 thi\u00ean \u0111\u1ecbch nh\u01b0 chim \u0103n s\u00e2u, m\u1ed9t s\u1ed1 lo\u00e0i c\u00f4n tr\u00f9ng c\u00f3 l\u1ee3i nh\u01b0 b\u1ecd ng\u1ef1a, c\u00e1c lo\u00e0i ong k\u00fd sinh tr\u00ean tr\u1ee9ng v\u00e0 s\u00e2u non c\u1ee7a s\u00e2u h\u1ea1i c\u00e2y ng\u1eadp m\u1eb7n.<\/p>\n

Ch\u1ec9 s\u1eed d\u1ee5ng bi\u1ec7n ph\u00e1p phun thu\u1ed1c ho\u00e1 ch\u1ea5t trong tr\u01b0\u1eddng h\u1ee3p s\u00e2u h\u1ea1i xu\u1ea5t hi\u1ec7n lan tr\u00e0n v\u1edbi m\u1eadt \u0111\u1ed9 cao, c\u00f3 nguy c\u01a1 b\u00f9ng n\u1ed5 th\u00e0nh d\u1ecbch. N\u00ean s\u1eed d\u1ee5ng c\u00e1c lo\u1ea1i thu\u1ed1c c\u00f3 ngu\u1ed3n g\u1ed1c th\u1ef1c v\u1eadt, ch\u00f3ng ph\u00e2n gi\u1ea3i, \u00edt \u0111\u1ed9c h\u1ea1i v\u1edbi ng\u01b0\u1eddi v\u00e0 gia s\u00fac nh\u01b0 c\u00e1c lo\u1ea1i thu\u1ed1c c\u00f3 g\u1ed1c Perythroide.<\/p>\n

\u0110\u00e1nh gi\u00e1 ti\u00eau chu\u1ea9n c\u00e2y tr\u1ed3ng sau 2 th\u00e1ng theo t\u1ef7 l\u1ec7 s\u1ed1ng n\u1ebfu l\u1edbn h\u01a1n 85% l\u00e0 \u0111\u1ea3m b\u1ea3o t\u1ef7 l\u1ec7 th\u00e0nh r\u1eebng (theo quy \u0111\u1ecbnh \u0111\u1ed1i v\u1edbi c\u00e2y ng\u1eadp m\u1eb7n l\u00e0 70%). N\u1ebfu t\u1ef7 l\u1ec7 s\u1ed1ng <85% c\u1ea7n ti\u1ebfn h\u00e0nh tr\u1ed3ng d\u1eb7m \u0111\u1ec3 \u0111\u1ea1t m\u1eadt \u0111\u1ed9, \u0111\u1eb7c bi\u1ec7t n\u1ebfu c\u00e2y ch\u1ebft >50% ph\u1ea3i thanh l\u00fd v\u00e0 tr\u1ed3ng l\u1ea1i. S\u1ed1 l\u00e1 trung b\u00ecnh m\u1ed9t c\u00e2y l\u00e0 3-4 l\u00e1.<\/p>\n

5. Khai tha\u0301c, s\u01b0\u0309 du\u0323ng<\/b><\/p>\n

G\u1ed7 m\u1ea7u tr\u1eafng h\u1ed3ng, c\u1ee9ng, n\u1eb7ng, d\u00f9ng l\u00e0m c\u1ee7i, \u0111\u1ed1t than, l\u00e0m v\u1eadt li\u1ec7u x\u00e2y d\u1ef1ng, v\u00e1n s\u00e0n. V\u1ecf c\u00e2y ch\u1ee9a nhi\u1ec1u tanin.<\/p>\n

Sau khi r\u1eebng tr\u1ed3ng kh\u00e9p t\u00e1n 4-5 n\u0103m, ch\u1eadm nh\u1ea5t l\u00e0 1 n\u0103m sau ph\u1ea3i ti\u1ebfn h\u00e0nh ch\u1eb7t nu\u00f4i d\u01b0\u1ee1ng \u1edf tu\u1ed5i 5-6, c\u01b0\u1eddng \u0111\u1ed9 t\u1ec9a 35-50%; \u1edf tu\u1ed5i 11-12, c\u01b0\u1eddng \u0111\u1ed9 t\u1ec9a 30-35%, s\u1ed1 c\u00e2y c\u00f2n l\u1ea1i 5000-6000 c\u00e2y\/ha; \u1edf tu\u1ed5i 20-21, c\u01b0\u1eddng \u0111\u1ed9 t\u1ec9a 30- 35%, s\u1ed1 c\u00e2y c\u00f2n l\u1ea1i 2500-3000 c\u00e2y\/ha.<\/p>\n

\u0110\u1ebfn khi khai th\u00e1c ch\u00ednh \u1edf tu\u1ed5i 30, m\u1eadt \u0111\u1ed9 c\u00f2n l\u1ea1i kho\u1ea3ng 2000 c\u00e2y\/ha, tr\u1eef l\u01b0\u1ee3ng trung b\u00ecnh l\u00e0 300-320 m3<\/sup>\/ha.<\/p>\n

Vi\u1ec7c khai th\u00e1c r\u1eebng ph\u1ea3i th\u1ef1c hi\u1ec7n \u0111\u00fang c\u00e1c tr\u00ecnh t\u1ef1, th\u1ee7 t\u1ee5c theo quy \u0111\u1ecbnh t\u1ea1i quy\u1ebft \u0111\u1ecbnh s\u1ed1 02\/1999-Q\u0110-BNN-PTLN, n\u00e0y 05\/01\/1999.<\/p>\n","protected":false},"excerpt":{"rendered":"

\u0110\u01af\u01a0\u0301C \u0110\u00d4I T\u00ean kh\u00e1c: \u0110\u01b0\u1edbc \u00a0T\u00ean khoa h\u1ecdc:\u00a0\u00a0\u00a0\u00a0\u00a0 Rhizophora apiculata BL. H\u1ecd th\u1ef1c v\u1eadt: \u0110\u01b0\u1edbc (Rhizophoraceae) (Ngu\u1ed3n ch\u00ednh: Ng\u00f4 \u0110\u00ecnh Qu\u1ebf, 2010) 1. \u0110\u0103\u0323c \u0111i\u00ea\u0309m hi\u0300nh tha\u0301i L\u00e0 lo\u00e0i c\u00e2y g\u1ed7 ng\u1eadp m\u1eb7n th\u01b0\u1eddng xanh, c\u00e2y c\u00f3 th\u1ec3 cao t\u1edbi 30 m, \u0111\u01b0\u1eddng k\u00ednh \u0111\u1ebfn 0,7m. Th\u00e2n tr\u00f2n th\u1eb3ng, v\u1edbi v\u00e0i \u0111\u00f4i c\u1eb7p m\u1ea5u c\u00e0nh […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[15,72],"tags":[],"_links":{"self":[{"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/12906"}],"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=12906"}],"version-history":[{"count":4,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/12906\/revisions"}],"predecessor-version":[{"id":12911,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/12906\/revisions\/12911"}],"wp:attachment":[{"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/media?parent=12906"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/categories?post=12906"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/tags?post=12906"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}