{"id":14521,"date":"2015-04-02T09:35:08","date_gmt":"2015-04-02T02:35:08","guid":{"rendered":"http:\/\/vafs.gov.vn\/vn\/?p=14521"},"modified":"2015-04-02T09:41:09","modified_gmt":"2015-04-02T02:41:09","slug":"bao-cao-ket-qua-de-tai-ket-qua-nghien-cuu-ky-thuat-gay-trong-cay-cho-chi-parashorea-chinensis-tai-vung-phong-ho-dau-nguon-song-da","status":"publish","type":"post","link":"https:\/\/vafs.gov.vn\/vn\/bao-cao-ket-qua-de-tai-ket-qua-nghien-cuu-ky-thuat-gay-trong-cay-cho-chi-parashorea-chinensis-tai-vung-phong-ho-dau-nguon-song-da\/","title":{"rendered":"B\u00e1o c\u00e1o k\u1ebft qu\u1ea3 \u0111\u1ec1 t\u00e0i: K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u k\u1ef9 thu\u1eadt g\u00e2y tr\u1ed3ng c\u00e2y Ch\u00f2 ch\u1ec9 (Parashorea chinensis) t\u1ea1i v\u00f9ng ph\u00f2ng h\u1ed9 \u0111\u1ea7u ngu\u1ed3n s\u00f4ng \u0110\u00e0"},"content":{"rendered":"

\u0110o\u00e0n \u0110\u00ecnh Tam<\/em><\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 1. \u0110\u1eb7t v\u1ea5n \u0111\u1ec1<\/b><\/p>\n

Lo\u00e0i Ch\u00f2 ch\u1ec9 (Parashorea chinensis<\/i> Wang Hsie) c\u00f2n c\u00f3 t\u00ean g\u1ecdi l\u00e0 M\u1ea1y kho, thu\u1ed9c h\u1ecd D\u1ea7u (Dipterocarpaceae) ng\u00e0nh M\u1ecdc lan ( Mag noliophyta), h\u1ea1t k\u00edn (Angiospermae) l\u00e0 lo\u00e0i c\u00e2y c\u00f3 gi\u00e1 tr\u1ecb kinh t\u1ebf cao thu\u1ed9c ph\u00e2n nh\u00f3m ch\u00ednh nh\u00f3m ba, l\u00e0 lo\u00e0i c\u00e2y g\u1ed7 l\u1edbn, sinh tr\u01b0\u1edfng nhanh, th\u00e2n th\u1eb3ng, ph\u00e2n c\u00e0nh cao. Ch\u00f2 ch\u1ec9 thu\u1ed9c lo\u00e0i c\u00e2y c\u00f3 b\u1ea1nh v\u00e8 l\u1edbn, g\u1ed7 m\u00e0u v\u00e0ng nh\u1ea1t, kh\u00f4ng hay b\u1ecb n\u1ee9t, ch\u1ed1ng \u0111\u01b0\u1ee3c m\u1ed1i m\u1ecdt, ch\u1ecbu \u0111\u01b0\u1ee3c n\u01b0\u1edbc n\u00ean th\u01b0\u1eddng \u0111\u01b0\u1ee3c d\u00f9ng trong x\u00e2y d\u1ef1ng v\u00e0 \u0111\u1ed3 m\u1ed9c. Hi\u1ec7n nay vi\u1ec7c g\u00e2y tr\u1ed3ng c\u00e2y Ch\u00f2 ch\u1ec9 g\u1eb7p r\u1ea5t nhi\u1ec1u kh\u00f3 kh\u0103n v\u00ec thi\u1ebfu th\u00f4ng tin v\u00e0 nh\u1eefng c\u01a1 s\u1edf khoa h\u1ecdc c\u1ea7n thi\u1ebft. Ch\u00ednh v\u00ec xu\u1ea5t ph\u00e1t t\u1eeb th\u1ef1c t\u1ebf \u0111\u00f3, Trung t\u00e2m nghi\u00ean c\u1ee9u Sinh th\u00e1i v\u00e0 M\u00f4i tr\u01b0\u1eddng r\u1eebng \u0111\u00e3 ti\u1ebfn h\u00e0nh th\u1ef1c hi\u1ec7n \u0111\u1ec1 t\u00e0i \u201cNghi\u00ean c\u1ee9u m\u1ed9t s\u1ed1 c\u01a1 s\u1edf khoa h\u1ecdc v\u00e0 bi\u1ec7n ph\u00e1p k\u1ef9 thu\u1eadt g\u00e2y tr\u1ed3ng c\u00e2y Ch\u00f2 ch\u1ec9<\/i> (Parashorea chinensis<\/i> Wang Hsie) t\u1ea1i v\u00f9ng ph\u00f2ng h\u1ed9 \u0111\u1ea7u ngu\u1ed3n s\u00f4ng \u0110\u00e0”<\/i>. <\/b><\/p>\n

B\u00e0i b\u00e1o n\u00e0y nh\u1eb1m g\u00f3p ph\u1ea7n cung c\u1ea5p nh\u1eefng th\u00f4ng tin khoa h\u1ecdc v\u1ec1 lo\u00e0i Ch\u00f2 ch\u1ec9 l\u00e0m ti\u1ec1n \u0111\u1ec1 cho vi\u1ec7c nghi\u00ean c\u1ee9u s\u00e2u h\u01a1n c\u00e1c \u0111\u1eb7c t\u00ednh sinh v\u1eadt h\u1ecdc c\u1ee7a lo\u00e0i c\u00e2y n\u00e0y trong nh\u1eefng th\u1eddi gian ti\u1ebfp theo.<\/p>\n

2. \u00a0N\u1ed9i dung v\u00e0 ph\u01b0\u01a1ng ph\u00e1p nghi\u00ean c\u1ee9u<\/i><\/b><\/p>\n

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

– Nghi\u00ean c\u1ee9u m\u1ed9t s\u1ed1 \u0111\u1eb7c \u0111i\u1ec3m l\u00e2m h\u1ecdc: c\u1ea5u tr\u00fac t\u1ed5 th\u00e0nh, \u0111\u1eb7c \u0111i\u1ec3m t\u00e1i sinh,…<\/p>\n

– Nghi\u00ean c\u1ee9u m\u1ed9t s\u1ed1 \u0111\u1eb7c \u0111i\u1ec3m sinh l\u00fd \u1edf giai \u0111o\u1ea1n v\u01b0\u1eddn \u01b0\u01a1m<\/p>\n

– Nghi\u00ean c\u1ee9u m\u1ed9t s\u1ed1 gi\u1ea3i ph\u00e1p k\u1ef9 thu\u1eadt l\u00e2m sinh g\u00e2y tr\u1ed3ng c\u00e2y ch\u00f2 ch\u1ec9<\/p>\n

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

– Ph\u01b0\u01a1ng ph\u00e1p \u0111i\u1ec1u tra, kh\u1ea3o s\u00e1t trong l\u00e2m h\u1ecdc \u0111\u1ec3 \u0111o \u0111\u1ebfm, thu th\u1eadp c\u00e1c s\u1ed1 li\u1ec7u v\u1ec1 \u0111\u1ea5t \u0111ai, t\u1ed5 th\u00e0nh, c\u1ea5u tr\u00fac, t\u00e1i sinh, sinh tr\u01b0\u1edfng,…th\u00f4ng qua c\u00e1c \u00f4 ti\u00eau chu\u1ea9n ng\u1eabu nhi\u00ean, \u0111i\u1ec3n h\u00ecnh di\u1ec7n t\u00edch 2500m2<\/sup> v\u00e0 \u00f4 ti\u00eau chu\u1ea9n d\u1ea1ng b\u1ea3n 10m2<\/sup><\/p>\n

– Ph\u01b0\u01a1ng ph\u00e1p th\u00ed nghi\u1ec7m th\u1ef1c nghi\u1ec7m<\/p>\n

* Nghi\u00ean c\u1ee9u ch\u1ebf \u0111\u1ed9 dinh d\u01b0\u1ee1ng c\u1ee7a c\u00e2y Ch\u00f2 ch\u1ec9 \u1edf giai \u0111o\u1ea1n v\u01b0\u1eddn \u01b0\u01a1m b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p x\u00e1c \u0111\u1ecbnh nhu c\u1ea7u dinh d\u01b0\u1ee1ng c\u1ee7a Nguy\u1ec5n D\u01b0 Minh v\u00e0 Nguy\u1ec5n Nh\u01b0 khanh (1982). B\u1ed1 tr\u00ed 11 c\u00f4ng th\u1ee9c v\u1edbi 4 kho\u1ea3ng h\u00e0m l\u01b0\u1ee3ng kh\u00e1c nhau v\u1ec1 c\u00e1c nguy\u00ean t\u1ed1 NPK<\/p>\n

* Nghi\u00ean c\u1ee9u ch\u1ebf \u0111\u1ed9 \u00e1nh s\u00e1ng theo ph\u01b0\u01a1ng ph\u00e1p c\u1ee7a Nguy\u1ec5n H\u1eefu Th\u01b0\u1edbc v\u00e0 Turkii v\u1edbi 4 c\u00f4ng th\u1ee9c che s\u00e1ng l\u00e0 25%, 50%, 75% v\u00e0 kh\u00f4ng che s\u00e1ng<\/p>\n

* Nghi\u00ean c\u1ee9u nhu c\u1ea7u n\u01b0\u1edbc c\u1ee7a Ch\u00f2 ch\u1ec9 \u1edf giai \u0111o\u1ea1n v\u01b0\u1eddn \u01b0\u01a1m theo ph\u01b0\u01a1ng ph\u00e1p c\u1ee7a Valter v\u00e0 Pinhevich, 1975. V\u1edbi 5 c\u00f4ng th\u1ee9c th\u00ed nghi\u1ec7m<\/p>\n

– Ph\u01b0\u01a1ng ph\u00e1p tr\u1ed3ng r\u1eebng th\u00ed nghi\u1ec7m: x\u00e2y d\u1ef1ng m\u00f4 h\u00ecnh th\u00ed nghi\u1ec7m v\u1edbi di\u1ec7n t\u00edch 4 ha\u00a0 v\u1edbi c\u00e1c c\u00f4ng th\u1ee9c m\u1eadt \u0111\u1ed9, t\u1ef7 l\u1ec7 ph\u00e2n b\u00f3n, h\u1ed7n giao v\u00e0 v\u1ecb tr\u00ed tr\u1ed3ng theo ph\u01b0\u01a1ng ph\u00e1p ng\u1eabu nhi\u00ean \u0111\u1ea7y \u0111\u1ee7.<\/p>\n

– D\u00f9ng ph\u00e2n t\u00edch ph\u01b0\u01a1ng sai v\u00e0 ti\u00eau chu\u1ea9n t \u0111\u1ec3 ki\u1ec3m tra sai d\u1ecb gi\u1eefa c\u00e1c trung b\u00ecnh m\u1eabu v\u00e0 l\u1ef1a ch\u1ecdn c\u00f4ng th\u1ee9c t\u1ed1t nh\u1ea5t. X\u1eed l\u00fd s\u1ed1 li\u1ec7u theo ch\u01b0\u01a1ng tr\u00ecnh ph\u1ea7n m\u1ec1m Excell.<\/p>\n

3. K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u<\/b><\/p>\n

3.1. M\u1ed9t s\u1ed1 \u0111\u1eb7c \u0111i\u1ec3m sinh th\u00e1i<\/i><\/b><\/p>\n

Ch\u00f2\u00a0 ch\u1ec9 l\u00e0 lo\u00e0i c\u00f3 bi\u00ean \u0111\u1ed9 Sinh th\u00e1i h\u1eb9p, \u1edf ph\u00eda B\u1eafc Ch\u00f2 ch\u1ec9 ph\u00e2n b\u1ed1 \u1edf c\u00e1c t\u1ec9nh S\u01a1n La (Ph\u00f9 Y\u00ean, b\u1eafc Y\u00ean), Tuy\u00ean Quang (Na Hang, Chi\u00eam Ho\u00e1), Ph\u00fa Th\u1ecd (Thanh S\u01a1n). T\u1ea1i mi\u1ec1n Trung c\u00f3 c\u00e1c t\u1ec9nh Ngh\u1ec7 An (Qu\u1ef3 Ch\u00e2u), H\u00e0 T\u0129nh (H\u01b0\u01a1ng S\u01a1n, H\u01b0\u01a1ng Kh\u00ea), v\u00e0 m\u1ecdc t\u1ef1 nhi\u00ean \u1edf n\u01a1i ven s\u00f4ng, su\u1ed1i, ch\u00e2n ho\u1eb7c s\u01b0\u1eddn n\u00fai d\u1ed1c, \u0111\u1ed9 cao \u00a3 700m, n\u01a1i c\u00f3 t\u1ea7ng \u0111\u1ea5t kh\u00e1 d\u00e0y.Th\u00e0nh ph\u1ea7n c\u01a1 gi\u1edbi t\u1eeb th\u1ecbt trung b\u00ecnh \u0111\u1ebfn s\u00e9t n\u1eb7ng. \u0110\u1ea5t c\u00f3 ph\u1ea3n \u1ee9ng h\u01a1i chua (< 5). H\u00e0m l\u01b0\u1ee3ng m\u00f9n kh\u00e1 cao nh\u1ea5t l\u00e0 \u1edf t\u1ea7ng 0 \u2013 20 cm. C\u00e1c ch\u1ea5t d\u1ec5 ti\u00eau P2<\/sub>O5\u00a0 <\/sub>\u0111\u1ea1t t\u1eeb\u00a0 9,0 \u2013 16,2 ppm v\u00e0 K2<\/sub>O t\u1eeb\u00a0 8,3 \u2013 64 ppm. L\u01b0\u1ee3ng Ca++ <\/sup>v\u00e0 Mg++<\/sup>\u00a0 \u1edf m\u1ee9c th\u1ea5p ch\u1ec9 t\u1eeb 0,7 \u2013 5,1 ldl\/100g \u0111\u1ea5t. \u0110\u1ed9 chua trao \u0111\u1ed5i (H+<\/sup> v\u00e0 AL+++<\/sup>) c\u0169ng \u1edf m\u1ee9c th\u1ea5p, \u0111\u1ed1i v\u1edbi AL+++ <\/sup>th\u00ec \u0111\u1ea1t t\u1eeb 0,12 \u2013 1,81 ldl\/100g \u0111\u1ea5t.<\/p>\n

3.2. \u0110\u1eb7c \u0111i\u1ec3m l\u00e2m ph\u1ea7n c\u00f3 Ch\u00f2 ch\u1ec9 ph\u00e2n b\u1ed1<\/i><\/b><\/p>\n

3.2.1. T\u1ed5 th\u00e0nh lo\u00e0i c\u00e2y g\u1ed7.<\/i><\/p>\n

Trong l\u00e2m ph\u1ea7n \u0111i\u1ec1u tra t\u1ea1i Ph\u00fa Th\u1ecd v\u00e0 Ho\u00e0 B\u00ecnh, c\u00f3 864 – 943 c\u00e1 th\u1ec3 c\u1ee7a 49 – 59 lo\u00e0i. S\u1ed1 l\u01b0\u1ee3ng c\u00e1 th\u1ec3 b\u00ecnh qu\u00e2n Ntb<\/sub> =\u00a0 15,94 \u2013 17,60 c\u00e2y\/lo\u00e0i. Ch\u00f2 ch\u1ec9 c\u00f3 23 – 42 c\u00e1 th\u1ec3, chi\u1ebfm 2,6 – 4,5% t\u1ed5ng s\u1ed1 c\u00e2y trong l\u00e2m ph\u1ea7n.<\/p>\n

3.2.2. T\u1ed5 th\u00e0nh theo ti\u1ebft di\u1ec7n ngang (G)<\/i><\/p>\n

Ch\u00f2 ch\u1ec9 c\u00f3 23 – 42 c\u00e1 th\u1ec3 chi\u1ebfm 2,5 – 4,5% s\u1ed1 c\u00e1 th\u1ec3 v\u00e0 \u0111\u1ee9ng \u1edf v\u1ecb tr\u00ed th\u1ee9 5 \u2013 9 tu\u1ef3 thu\u1ed9c \u0111\u1ecba \u0111i\u1ec3m \u0111i\u1ec1u tra, tuy nhi\u00ean ch\u1ec9 \u0111\u1ea1t \u0111\u01b0\u1ee3c 3,2% t\u1ed5ng G. Trong c\u00f4ng th\u1ee9c t\u1ed5 th\u00e0nh theo G c\u00f3 31 lo\u00e0i chi\u1ebfm 89,9% t\u1ed5ng G c\u1ee7a l\u00e2m ph\u1ea7n (Ph\u00fa Th\u1ecd) v\u00e0 23 lo\u00e0i chi\u1ebfm 71,1% t\u1ed5ng G c\u1ee7a l\u00e2m ph\u1ea7n (Ho\u00e0 B\u00ecnh).<\/p>\n

3.2.3. C\u1ea5u tr\u00fac t\u1ed5 th\u00e0nh theo tr\u1eef l\u01b0\u1ee3ng.<\/i><\/p>\n

Ch\u00f2 ch\u1ec9 c\u00f3 23 – 42 c\u00e1 th\u1ec3 chi\u1ebfm 2,6 – 5,5% s\u1ed1 c\u00e1 th\u1ec3, \u0111\u1ea1t 3,2 – 5,5% t\u1ed5ng G v\u00e0 4,0 – 5,5% t\u1ed5ng V. Tr\u1eef l\u01b0\u1ee3ng \u0111\u1ea1t 12,5 – 19,70 m3\/ha. C\u00f4ng th\u1ee9c c\u1ea5u tr\u00fac t\u1ed5 th\u00e0nh theo V c\u00f3 31 lo\u00e0i chi\u1ebfm 92,20% t\u1ed5ng V c\u1ee7a c\u1ea3 l\u00e2m ph\u1ea7n (Ph\u00fa Th\u1ecd) v\u00e0\u00a0 23 lo\u00e0i chi\u1ebfm 86% t\u1ed5ng V c\u1ee7a L\u00e2m ph\u1ea7n (Ho\u00e0 B\u00ecnh).<\/p>\n

3.2.4. C\u1ea5u tr\u00fac m\u1eadt \u0111\u1ed9.<\/i><\/p>\n

M\u1eadt \u0111\u1ed9 c\u00e1c lo\u00e0i c\u00e2y c\u00f3 trong c\u00e1c l\u00e2m ph\u1ea7n \u0111i\u1ec1u tra t\u1ea1i Ph\u00fa Th\u1ecd l\u00e0 390 c\u00e2y\/ha v\u00e0 t\u1ea1i Ho\u00e0 B\u00ecnh N = 360 c\u00e2y\/ha v\u00e0 m\u1eadt \u0111\u1ed9 c\u00e2y Ch\u00f2 ch\u1ec9 ph\u00e2n b\u1ed1 l\u00e0 21 c\u00e2y\/ha (Ph\u00fa Th\u1ecd) v\u00e0 12 c\u00e2y\/ha (Ho\u00e0 B\u00ecnh).<\/p>\n

3.2.5. T\u1ed5 th\u00e0nh, m\u1eadt \u0111\u1ed9, ch\u1ea5t l\u01b0\u1ee3ng c\u00e2y Ch\u00f2 ch\u1ec9 t\u00e1i sinh.<\/i><\/p>\n

– T\u1ed5 th\u00e0nh:<\/i> Ch\u00f2 ch\u1ec9 c\u00f3 s\u1ed1 c\u00e1 th\u1ec3 t\u00e1i sinh th\u1ea5p nh\u1ea5t trong l\u00e2m ph\u1ea7n (16 c\u00e2y t\u1ea1i Ho\u00e0 B\u00ecnh v\u00e0 20 c\u00e2y t\u1ea1i Ph\u00fa Th\u1ecd). Nh\u01b0ng trong c\u00f4ng th\u1ee9c t\u1ed5 th\u00e0nh lo\u00e0i c\u00e2y g\u1ed7 th\u00ec Ch\u00f2 ch\u1ec9 l\u1ea1i c\u00f3 h\u1ec7 s\u1ed1 0,26 v\u00e0 \u0111\u1ee9ng \u1edf v\u1ecb tr\u00ed th\u1ee9 14\/19 lo\u00e0i (Ho\u00e0 B\u00ecnh) v\u00e0 h\u1ec7 s\u1ed1 0,45 v\u00e0 \u1edf v\u1ecb tr\u00ed th\u1ee9 5 \/23 lo\u00e0i (Ph\u00fa Th\u1ecd).<\/p>\n

\u00a0<\/i><\/b>\u00a0– <\/b>M\u1eadt \u0111\u1ed9 v\u00e0 ch\u1ea5t l\u01b0\u1ee3ng:<\/i> M\u1eadt \u0111\u1ed9 t\u00e1i sinh l\u00e0 7.176 c\u00e2y\/ha (Ph\u00fa Th\u1ecd) v\u00e0 6.153 c\u00e2y\/ha (Ho\u00e0 B\u00ecnh), \u0111\u00e2y l\u00e0 m\u1eadt \u0111\u1ed9 t\u00e1i sinh r\u1ea5t l\u1edbn. Trong \u0111\u00f3, Ch\u00f2 ch\u1ec9 c\u00f3 m\u1eadt \u0111\u1ed9 t\u00e1i sinh l\u00e0 197 c\u00e2y\/ha, chi\u1ebfm 2,7% (Ph\u00fa Th\u1ecd) v\u00e0 156 c\u00e2y\/ha chi\u1ebfm 2,5% (Ho\u00e0 B\u00ecnh).<\/p>\n

– Trong 20 v\u00e0 16 c\u00e2y Ch\u00f2 ch\u1ec9 t\u00e1i sinh trong \u00f4 \u0111i\u1ec1u tra th\u00ec s\u1ed1 c\u00e2y t\u00e1i sinh c\u00f3 tri\u1ec3n v\u1ecdng (c\u00f3 Hvn > 1m) l\u00e0 7 c\u00e2y chi\u1ebfm 4,2% (Ph\u00fa Th\u1ecd) v\u00e0 5 c\u00e2y chi\u1ebfm 3,9% (Ho\u00e0 B\u00ecnh)<\/p>\n

3.3.<\/b> \u1ea2nh h\u01b0\u1edfng c\u1ee7a NPK \u0111\u1ebfn sinh tr\u01b0\u1edfng v\u00e0 t\u1ed1c \u0111\u1ed9 sinh tr\u01b0\u1edfng t\u01b0\u01a1ng \u0111\u1ed1i c\u1ee7a Ch\u00f2 ch\u1ec9 \u1edf giai \u0111o\u1ea1n v\u01b0\u1eddn \u01b0\u01a1m.<\/b><\/p>\n

3.3.1. \u1ea2nh h\u01b0\u1edfng c\u1ee7a N.<\/i><\/b><\/p>\n

H\u00e0m l\u01b0\u1ee3ng N c\u00f3 \u1ea3nh h\u01b0\u1edfng kh\u00e1c nhau \u0111\u1ebfn sinh tr\u01b0\u1edfng (P< 0,05). Sau 6 th\u00e1ng chi\u1ec1u cao th\u00e2n t\u0103ng tr\u01b0\u1edfng \u0111\u1ea1t m\u1ee9c 133,9- 197% b\u00f3n ph\u00e2n theo c\u00f4ng th\u1ee9c 10 (0,29g NH4<\/sub>NO3<\/sub> + 0,43g NaH2<\/sub>PO4<\/sub>.2H2<\/sub>O + 0,08g KCl \/ B\u1ea7u) cho sinh tr\u01b0\u1edfng m\u1ea1nh nh\u1ea5t, \u0111\u1ea1t 20,8cm.<\/p>\n

T\u1ed1c \u0111\u1ed9 sinh tr\u01b0\u1edfng gi\u00e1n ti\u1ebfp v\u00e0 tr\u1ef1c ti\u1ebfp (IDI) giao \u0111\u1ed9ng t\u1eeb 93,8- 99,2%, t\u1ed1c \u0111\u1ed9 sinh tr\u01b0\u1edfng t\u01b0\u01a1ng \u0111\u1ed1i \u0111\u1ea1t m\u1ee9c cao nh\u1ea5t l\u00e0 0,019g\/ng\u00e0y. Khi t\u0103ng l\u01b0\u1ee3ng ph\u00e2n b\u00f3n th\u00ec t\u1ed1c \u0111\u1ed9 sinh tr\u01b0\u1edfng t\u01b0\u01a1ng \u0111\u1ed1i gi\u1ea3m d\u1ea7n \u0111\u1ea1t c\u00e1c gi\u00e1 tr\u1ecb t\u01b0\u01a1ng \u1ee9ng l\u00e0 0,0179 v\u00e0 0,0175g\/ng\u00e0y.<\/p>\n

\"15-04-02<\/a><\/p>\n

Khi t\u0103ng l\u01b0\u1ee3ng b\u00f3n K th\u00ec sinh tr\u01b0\u1edfng v\u00e0 t\u1ed1c \u0111\u1ed9 t\u0103ng tr\u01b0\u1edfng t\u01b0\u01a1ng \u0111\u1ed1i c\u1ee7a c\u00e2y th\u00ed nghi\u1ec7m c\u0169ng t\u0103ng theo, cao nh\u1ea5t khi s\u1eed d\u1ee5ng 0,29g NH4<\/sub>NO3<\/sub> + 0,43g NaH2<\/sub>PO4<\/sub>.2H2<\/sub>O + 0,23g 08g KCl\/b\u1ea7u, chi\u1ec1u cao th\u00e2n \u0111\u00e3 \u0111\u1ea1t m\u1ee9c t\u0103ng tr\u01b0\u1edfng t\u0103ng t\u1eeb 133,9% l\u00ean 211,1% (c\u00f4ng th\u1ee9c K th\u00edch h\u1ee3p nh\u1ea5t cho sinh tr\u01b0\u1edfng c\u1ee7a c\u00e2y th\u00ed nghi\u1ec7m, t\u01b0\u01a1ng \u1ee9ng v\u1edbi gi\u00e1 tr\u1ecb c\u1ef1c \u0111\u1ea1i l\u00e0 0,0194g\/ng\u00e0y)<\/p>\n

3.4. \u1ea2nh h\u01b0\u1edfng c\u1ee7a c\u00e1c ch\u1ebf \u0111\u1ed9 che s\u00e1ng kh\u00e1c nhau \u0111\u1ebfn sinh tr\u01b0\u1edfng, H\u00ecnh th\u00e1i gi\u1ea3i ph\u1eabu v\u00e0 h\u00e0m l\u01b0\u1ee3ng di\u1ec7p l\u1ee5c c\u1ee7a Ch\u00f2 ch\u1ec9 \u1edf giai \u0111o\u1ea1n v\u01b0\u1eddn \u01b0\u01a1m.<\/b><\/p>\n

– \u00c1nh s\u00e1ng c\u00f3 \u1ea3nh h\u01b0\u1edfng kh\u00e1c nhau \u0111\u1ebfn sinh tr\u01b0\u1edfng\u00a0 (P< 0,05). \u1ede c\u01b0\u1eddng \u0111\u1ed9 chi\u1ebfu s\u00e1ng 50% c\u00e2y c\u00f3 sinh tr\u01b0\u1edfng chi\u1ec1u cao m\u1ea1nh nh\u1ea5t l\u00e0 23,6cm \u0111\u1ea1t t\u1ef7 l\u1ec7 222,9%. v\u00e0 gi\u1ea3m d\u1ea7n \u1edf c\u01b0\u1eddng \u0111\u1ed9 chi\u1ebfu s\u00e1ng \u1edf 75%, 25% v\u00e0 100%.<\/p>\n

– Khi \u1edf \u0111i\u1ec1u ki\u1ec7n chi\u1ebfu s\u00e1ng 100%, t\u1ed5ng l\u01b0\u1ee3ng di\u1ec7p l\u1ee5c trong l\u00e1 Ch\u00f2 ch\u1ec9 gi\u1ea3m xu\u1ed1ng th\u1ea5p nh\u1ea5t, ch\u1ec9 \u0111\u1ea1t 0,777mg\/g l\u00e1. T\u1ef7 l\u1ec7 di\u1ec7p l\u1ee5c a\/b c\u0169ng gi\u1ea3m th\u1ea5p l\u00e0 2,3056 (< 75%).<\/p>\n

– T\u1ef7 l\u1ec7 di\u1ec7p l\u1ee5c a\/b t\u0103ng d\u1ea7n khi c\u00e2y \u1edf c\u01b0\u1eddng \u0111\u1ed9 \u00e1nh s\u00e1ng cao.<\/p>\n

– C\u01b0\u1eddng \u0111\u1ed9 quang h\u1ee3p (Pn) cao nh\u1ea5t khi sinh tr\u01b0\u1edfng trong \u0111i\u1ec1u ki\u1ec7n chi\u1ebfu s\u00e1ng 50% \u0111\u1ea1t 2,83 \u00b5mol\/m2\/s. Khi \u1edf 100% \u00e1nh s\u00e1ng t\u1ef1 nhi\u00ean, quang h\u1ee3p c\u1ee7a c\u00e2y Ch\u00f2 ch\u1ec9 b\u1ecb \u1ee9c ch\u1ebf, c\u01b0\u1eddng \u0111\u1ed9 \u0111\u1ea1t m\u1ee9c \u00e2m l\u00e0 -0,08 \u00b5mol\/m2\/s.<\/p>\n

B\u1ea3ng 1. C\u01b0\u1eddng \u0111\u1ed9 quang h\u1ee3p v\u00e0 l\u01b0\u1ee3ng di\u1ec7p l\u1ee5c Ch\u00f2 ch\u1ec9 t\u00e1c \u0111\u1ed9ng b\u1edfi \u00e1nh s\u00e1ng<\/b><\/p>\n

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

C\u0110AS<\/b><\/p>\n<\/td>\n

\n

PAR (\u03bcmol\/m2\/s)<\/b><\/p>\n<\/td>\n

\n

Pn (\u03bcmol\/m2\/s)<\/b><\/p>\n

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

\n

Chlo. a\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 (mg\/g l\u00e1)<\/b><\/p>\n<\/td>\n

\n

Chlo. b\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 (mg\/g l\u00e1)<\/b><\/p>\n<\/td>\n

\n

(a+b) (mg\/g l\u00e1)<\/b><\/p>\n<\/td>\n

\n

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

\n

25%<\/b><\/p>\n<\/td>\n

\n

161,68<\/p>\n<\/td>\n

\n

1,39<\/p>\n<\/td>\n

\n

0,829<\/p>\n<\/td>\n

\n

0,394<\/p>\n<\/td>\n

\n

1,224<\/p>\n<\/td>\n

\n

2,1036<\/p>\n<\/td>\n<\/tr>\n

\n

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

\n

312,38<\/p>\n<\/td>\n

\n

2,83<\/p>\n<\/td>\n

\n

0,779<\/p>\n<\/td>\n

\n

0,333<\/p>\n<\/td>\n

\n

1,112<\/p>\n<\/td>\n

\n

2,3376<\/p>\n<\/td>\n<\/tr>\n

\n

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

\n

476,26<\/p>\n<\/td>\n

\n

1,91<\/p>\n<\/td>\n

\n

0,595<\/p>\n<\/td>\n

\n

0,248<\/p>\n<\/td>\n

\n

0,843<\/p>\n<\/td>\n

\n

2,4004<\/p>\n<\/td>\n<\/tr>\n

\n

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

\n

627,74<\/p>\n<\/td>\n

\n

-0,08<\/p>\n<\/td>\n

\n

0,542<\/p>\n<\/td>\n

\n

0,235<\/p>\n<\/td>\n

\n

0,777<\/p>\n<\/td>\n

\n

2,3056<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

– B\u1ec1 d\u00e0y l\u00e1 t\u0103ng d\u1ea7n l\u00e0 8,05; 8,45; 8,87 v\u00e0 9,48 khi l\u00e1 sinh tr\u01b0\u1edfng trong c\u00e1c \u0111i\u1ec1u ki\u1ec7n chi\u1ebfu s\u00e1ng l\u00e0 25%; 50%; 75%; 100%.<\/p>\n

– Trong \u0111i\u1ec1u ki\u1ec7n \u00e1nh s\u00e1ng 25% v\u00e0 50%, c\u1ea5u tr\u00fac m\u00f4 m\u1ec1m c\u00f3 b\u1ec1 d\u00e0y l\u1edbn.<\/p>\n

3.5. \u1ea2nh h\u01b0\u1edfng c\u1ee7a \u0111\u1ed9 \u1ea9m \u0111\u1ea5t \u0111\u1ebfn sinh tr\u01b0\u1edfng, v\u00e0 t\u1ed1c \u0111\u1ed9 sinh tr\u01b0\u1edfng t\u01b0\u01a1ng \u0111\u1ed1i c\u1ee7a Ch\u00f2 ch\u1ec9 \u1edf giai \u0111o\u1ea1n v\u01b0\u1eddn \u01b0\u01a1m.<\/b> \"15-04-02<\/a><\/p>\n

Khi ng\u1eebng t\u01b0\u1edbi v\u1edbi c\u00f9ng m\u1ed9t l\u01b0\u1ee3ng n\u01b0\u1edbc sau c\u00e1c th\u1eddi gian 1 ng\u00e0y, 3 ng\u00e0y, 5 ng\u00e0y v\u00e0 t\u01b0\u1edbi li\u00ean t\u1ee5c \u0111\u00e3 t\u1ea1o ra c\u00e1c m\u1ee9c \u0111\u1ed9 trong \u0111\u1ea5t t\u01b0\u01a1ng \u1ee9ng l\u00e0 25,22%; 20,65%; 11,46% v\u00e0 30,51%. \u1ede c\u00f4ng th\u1ee9c 5, sau 4 th\u00e1ng th\u00ed nghi\u1ec7m, c\u00e2y Ch\u00f2 ch\u1ec9 \u0111\u00e3 bi\u1ec3u hi\u1ec7n tr\u1ea1ng th\u00e1i h\u00e9o kh\u00f4ng ph\u1ee5c h\u1ed3i t\u01b0\u01a1ng \u1ee9ng v\u1edbi m\u1ee9c \u0111\u1ed9 \u1ea9m c\u1ee7a \u0111\u1ea5t l\u00e0 5,11%.<\/p>\n

RGR \u00a0\u00a0\u00a0\u00a0 = (logeW2 – logeW1) \/ (t2 – t2)<\/p>\n

RGR \u00a0\u00a0 = NAR x SLA x LWR<\/p>\n

\"15-04-02<\/a><\/p>\n

\u0110\u1ed9 \u1ea9m t\u0103ng t\u1eeb 25,22% l\u00ean 31,51% th\u00ec t\u1ed1c \u0111\u1ed9 t\u0103ng tr\u01b0\u1edfng t\u01b0\u01a1ng \u0111\u1ed1i c\u1ee7a c\u00e2y c\u00e0ng gi\u1ea3m t\u1eeb 0,0206g\/g.ng\u00e0y xu\u1ed1ng 0,0152g\/g.ng\u00e0y. Khi \u0111\u1ed9 \u1ea9m d\u01b0\u1edbi m\u1ee9c 25,22% th\u00ec \u0111\u1ed9 \u1ea9m v\u00e0 t\u1ed1c \u0111\u1ed9 t\u0103ng tr\u01b0\u1edfng t\u01b0\u01a1ng \u0111\u1ed1i t\u1ef7 l\u1ec7 thu\u1eadn v\u1edbi nhau, \u0111\u1ed9 \u1ea9m gi\u1ea3m t\u1eeb 25,22% xu\u1ed1ng 11,46% th\u00ec t\u1ed1c \u0111\u1ed9 t\u0103ng tr\u01b0\u1edfng t\u01b0\u01a1ng \u0111\u1ed1i c\u1ee7a c\u00e2y c\u0169ng gi\u1ea3m d\u1ea7n, \u0111\u1ea1t m\u1ee9c th\u1ea5p nh\u1ea5t l\u00e0 0,0162g\/g.ng\u00e0y \u1edf m\u1ee9c \u0111\u1ed9 \u1ea9m 11,46%<\/p>\n

3.6. K\u1ebft qu\u1ea3 x\u00e2y d\u1ef1ng m\u00f4 h\u00ecnh r\u1eebng tr\u1ed3ng th\u1eed nghi\u1ec7m.<\/b><\/p>\n

3.6.1. T\u1ef7 l\u1ec7 s\u1ed1ng.<\/i><\/b><\/p>\n

– T\u1ea1i c\u00f4ng th\u1ee9c th\u1eed nghi\u1ec7m ph\u00e2n b\u00f3n th\u00ec\u00a0 t\u1ef7 l\u1ec7 s\u1ed1ng t\u1ea1i c\u00f4ng th\u1ee9c b\u00f3n 200g N + 100g P + 100g K l\u00e0 cao h\u01a1n c\u1ea3 (96,7%) ti\u1ebfp \u0111\u1ebfn l\u00e0 c\u00f4ng th\u1ee9c ch\u1ec9 b\u00f3n 200g N + 100g P.<\/p>\n

– V\u1edbi c\u00e1c m\u1eadt \u0111\u1ed9 kh\u00e1c nhau th\u00ec t\u1ef7 l\u1ec7 s\u1ed1ng cao nh\u1ea5t l\u00e0 c\u00f4ng th\u1ee9c 540 c\u00e2y\/ha v\u00e0 th\u1ea5p nh\u1ea5t l\u00e0 c\u00f4ng th\u1ee9c 720 c\u00e2y\/ha.<\/p>\n

– T\u1ea1i m\u00f4 h\u00ecnh h\u1ed7n giao t\u1ef7 l\u1ec7 s\u1ed1ng l\u00e0 kh\u00e1 cao (\u0111\u1ec1u \u0111\u1ea1t 96,3%).<\/p>\n

– Th\u1ea5p nh\u1ea5t l\u00e0 t\u1ea1i v\u1ecb tr\u00ed \u0111\u1ec9nh (94%) v\u00e0 cao nh\u1ea5t l\u00e0 t\u1ea1i v\u1ecb tr\u00ed ch\u00e2n (95,3%)<\/p>\n

\"15-04-02<\/a><\/p>\n

3.6.2. Sinh tr\u01b0\u1edfng v\u1ec1 Do, Hvn<\/i><\/b><\/p>\n

\u1ede m\u00f4 h\u00ecnh b\u00f3n ph\u00e2n cho r\u1eebng tr\u1ed3ng th\u00ec t\u1ea1i c\u00f4ng th\u1ee9c b\u00f3n 200g N + 100g P l\u01b0\u1ee3ng t\u0103ng tr\u01b0\u1edfng v\u1ec1 Do \u0111\u1ea1t 1,74 cm v\u00e0 Hvn \u0111\u1ea1t 181 cm. \u1ede c\u00f4ng th\u1ee9c 200g N + 100g P + 100g K c\u00f3 Do = 1,87cm v\u00e0 Hvn = 194 cm (cao nh\u1ea5t). T\u1ea1i c\u00f4ng th\u1ee9c \u0111\u1ed1i ch\u1ee9ng th\u00ec c\u00e1c ch\u1ec9 ti\u00eau v\u1ec1 Do v\u00e0 Hvn l\u00e0 th\u1ea5p nh\u1ea5t trong m\u00f4 h\u00ecnh b\u00f3n ph\u00e2n (Do = 1,56 cm v\u00e0 Hvn = 160 cm).<\/p>\n

\u1ede m\u00f4 h\u00ecnh m\u1eadt \u0111\u1ed9 c\u00e2y sinh tr\u01b0\u1edfng kh\u00e1 t\u1ed1t. \u0110\u1eb7c bi\u1ec7t l\u00e0 c\u00f4ng th\u1ee9c tr\u1ed3ng 540 c\u00e2y\/ha c\u00f3 Do = 1,72 cm v\u00e0 Hvn = 188 cm (cao nh\u1ea5t) v\u00e0 th\u1ea5p nh\u1ea5t l\u00e0 t\u1ea1i c\u00f4ng th\u1ee9c 720 c\u00e2y\/ha. T\u1ea1i m\u00f4 h\u00ecnh Tr\u1ed3ng h\u1ed7n giao, c\u00e1c lo\u00e0i c\u00e2y tr\u1ed3ng nh\u01b0 Ch\u00f2 ch\u1ec9, S\u1ea5u, Re nh\u00ecn chung \u0111\u1ec1u c\u00f3 m\u1ee9c sinh tr\u01b0\u1edfng cao, trung b\u00ecnh Do = 1,76 \u2013 1,78 cm v\u00e0 Hvn = 181 – 182 cm).<\/p>\n

Ch\u00f2 ch\u1ec9 \u1edf v\u1ecb tr\u00ed ch\u00e2n c\u00f3 s\u1ee9c sinh tr\u01b0\u1edfng cao h\u01a1n c\u1ea3, v\u00e0 th\u1ea5p nh\u1ea5t l\u00e0 t\u1ea1i v\u1ecb tr\u00ed \u0111\u1ec9nh<\/p>\n

\"15-04-02<\/a><\/p>\n

.8.3. \u1ea2nh h\u01b0\u1edfng c\u1ee7a c\u00e1c c\u00f4ng th\u1ee9c th\u00ed nghi\u1ec7m \u0111\u1ebfn sinh tr\u01b0\u1edfng c\u1ee7a c\u00e2y tr\u1ed3ng<\/i><\/b><\/p>\n

– M\u1eadt \u0111\u1ed9 tr\u1ed3ng \u0111\u00e3 \u1ea3nh h\u01b0\u1edfng t\u1edbi sinh tr\u01b0\u1edfng c\u1ee7a c\u00e2y. V\u1edbi Do: tt\u00ednh to\u00e1n<\/sub> (4,033) > ttra b\u1ea3ng<\/sub> (2,45); V\u1edbi Hvn: tt\u00ednh to\u00e1n<\/sub> (9,88) > ttra b\u1ea3ng<\/sub> (2,45). C\u00f4ng th\u1ee9c tr\u1ed3ng v\u1edbi m\u1eadt \u0111\u1ed9 540 c\u00e2y\/ha l\u00e0 t\u1ed1t nh\u1ea5t.<\/p>\n

B\u1ea3ng 3. \u1ea2nh h\u01b0\u1edfng c\u1ee7a M\u1eadt \u0111\u1ed9 \u0111\u1ebfn Do v\u00e0 Hvn.<\/b><\/p>\n\n\n\n\n\n\n\n\n\n\n
\n

L\u1ea7n l\u1eb7p<\/b><\/p>\n<\/td>\n

\n

M\u1eadt \u0111\u1ed9 (c\u00e2y\/ha)<\/b><\/p>\n<\/td>\n<\/tr>\n

\n

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

\n

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

\n

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

\n

Do<\/i><\/b><\/p>\n<\/td>\n

\n

Hvn<\/i><\/b><\/p>\n<\/td>\n

\n

Do<\/i><\/b><\/p>\n<\/td>\n

\n

Hvn<\/i><\/b><\/p>\n<\/td>\n

\n

Do<\/i><\/b><\/p>\n<\/td>\n

\n

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

L\u1eb7p 1<\/b><\/td>\n\n

1,71<\/p>\n<\/td>\n

\n

187<\/p>\n<\/td>\n

\n

1,67<\/p>\n<\/td>\n

\n

174<\/p>\n<\/td>\n

\n

1,54<\/p>\n<\/td>\n

\n

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

L\u1eb7p 2<\/b><\/td>\n\n

1,73<\/p>\n<\/td>\n

\n

186<\/p>\n<\/td>\n

\n

1,68<\/p>\n<\/td>\n

\n

174<\/p>\n<\/td>\n

\n

1,55<\/p>\n<\/td>\n

\n

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

L\u1eb7p 3<\/b><\/td>\n\n

1,72<\/p>\n<\/td>\n

\n

190<\/p>\n<\/td>\n

\n

1,67<\/p>\n<\/td>\n

\n

172<\/p>\n<\/td>\n

\n

1,50<\/p>\n<\/td>\n

\n

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

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

1,72<\/b><\/p>\n<\/td>\n

\n

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

\n

1,67<\/b><\/p>\n<\/td>\n

\n

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

\n

1,53<\/b><\/p>\n<\/td>\n

\n

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

Sai ti\u00eau chu\u1ea9n (S^2)<\/b><\/td>\n0,3424<\/b><\/td>\n35,80735<\/b><\/td>\n0,1797<\/b><\/td>\n22,7534<\/b><\/td>\n0,2157<\/b><\/td>\n19,96969<\/b><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

– M\u1ee9c \u0111\u1ed9 ph\u00e2n b\u00f3n kh\u00e1c nhau \u0111\u00e3 \u1ea3nh h\u01b0\u1edfng t\u1edbi sinh tr\u01b0\u1edfng c\u1ee7a c\u00e2y tr\u1ed3ng. C\u00f4ng th\u1ee9c b\u00f3n 200g N +100g P + 100g K v\u1edbi m\u1eadt \u0111\u1ed9 540 c\u00e2y\/ha l\u00e0 c\u00f4ng th\u1ee9c \u0111\u1ea1t c\u00e1c ch\u1ec9 ti\u00eau sinh tr\u01b0\u1edfng l\u00e0 cao nh\u1ea5t so v\u1edbi c\u00e1c c\u00f4ng th\u1ee9c b\u00f3n ph\u00e2n kh\u00e1c<\/p>\n

B\u1ea3ng 4. \u1ea2nh h\u01b0\u1edfng c\u1ee7a ph\u00e2n b\u00f3n \u0111\u1ebfn sinh tr\u01b0\u1edfng c\u1ee7a c\u00e2y tr\u1ed3ng.<\/b><\/p>\n\n\n\n\n\n\n\n\n\n\n
\n

L\u1ea7n l\u1eb7p<\/b><\/p>\n<\/td>\n

\n

L\u01b0\u1ee3ng b\u00f3n (g\/h\u1ed1)<\/b><\/p>\n<\/td>\n<\/tr>\n

\n

200g N + 100g P<\/b><\/p>\n<\/td>\n

\n

200g N + 100g P + 100g K<\/b><\/p>\n<\/td>\n

\n

Kh\u00f4ng b\u00f3n<\/b><\/p>\n<\/td>\n<\/tr>\n

\n

Do<\/i><\/b><\/p>\n<\/td>\n

\n

Hvn<\/i><\/b><\/p>\n<\/td>\n

\n

Do<\/i><\/b><\/p>\n<\/td>\n

\n

Hvn<\/i><\/b><\/p>\n<\/td>\n

\n

Do<\/i><\/b><\/p>\n<\/td>\n

\n

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

L\u1eb7p 1<\/b><\/td>\n\n

1,75<\/p>\n<\/td>\n

\n

180<\/p>\n<\/td>\n

\n

1,86<\/p>\n<\/td>\n

\n

192<\/p>\n<\/td>\n

\n

1,56<\/p>\n<\/td>\n

\n

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

L\u1eb7p 2<\/b><\/td>\n\n

1,74<\/p>\n<\/td>\n

\n

180<\/p>\n<\/td>\n

\n

1,87<\/p>\n<\/td>\n

\n

195<\/p>\n<\/td>\n

\n

1,56<\/p>\n<\/td>\n

\n

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

L\u1eb7p 3<\/b><\/td>\n\n

1,74<\/p>\n<\/td>\n

\n

181<\/p>\n<\/td>\n

\n

1,87<\/p>\n<\/td>\n

\n

194<\/p>\n<\/td>\n

\n

1,55<\/p>\n<\/td>\n

\n

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

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

1,74<\/b><\/p>\n<\/td>\n

\n

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

\n

1,87<\/b><\/p>\n<\/td>\n

\n

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

\n

1,56<\/b><\/p>\n<\/td>\n

\n

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

Sai ti\u00eau chu\u1ea9n (S^2)<\/b><\/td>\n0,2064<\/b><\/td>\n18,593<\/b><\/td>\n0,2075<\/b><\/td>\n17,526<\/b><\/td>\n0,2649<\/b><\/td>\n22,718<\/b><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

– Ch\u00f2 ch\u1ec9 h\u1ed7n giao v\u1edbi S\u1ea5u ho\u1eb7c Re kh\u00f4ng c\u00f3 \u1ea3nh h\u01b0\u1edfng r\u00f5 r\u1ec7t \u0111\u1ebfn sinh tr\u01b0\u1edfng c\u1ee7a c\u00e1c lo\u00e0i c\u00e2y tr\u1ed3ng (kh\u00f4ng c\u00f3 s\u1ef1 kh\u00e1c bi\u1ec7t). V\u00ec v\u1eady c\u00f3 th\u1ec3 tr\u1ed3ng h\u1ed7n giao theo h\u00e0ng gi\u1eefa Ch\u00f2 ch\u1ec9 v\u1edbi S\u1ea5u ho\u1eb7c Re v\u1edbi m\u1eadt \u0111\u1ed9 540 c\u00e2y\/ha.<\/p>\n

– Ch\u00f2 ch\u1ec9 tr\u1ed3ng \u1edf c\u00e1c v\u1ecb tr\u00ed (ch\u00e2n, s\u01b0\u1eddn, \u0111\u1ec9nh) kh\u00e1c nhau \u0111\u00e3 \u1ea3nh h\u01b0\u1edfng t\u1edbi sinh tr\u01b0\u1edfng c\u1ee7a c\u00e2y tr\u1ed3ng.<\/p>\n

B\u1ea3ng 5. \u1ea2nh h\u01b0\u1edfng c\u1ee7a \u0111\u1ecba h\u00ecnh \u0111\u1ebfn Do v\u00e0 Hvn.<\/b><\/p>\n\n\n\n\n\n\n\n\n\n\n
\n

L\u1ea7n l\u1eb7p<\/b><\/p>\n<\/td>\n

\n

V\u1ecb tr\u00ed tr\u1ed3ng<\/b><\/p>\n<\/td>\n<\/tr>\n

\n

Ch\u00e2n<\/b><\/p>\n<\/td>\n

\n

S\u01b0\u1eddn<\/b><\/p>\n<\/td>\n

\n

\u0110\u1ec9nh<\/b><\/p>\n<\/td>\n<\/tr>\n

\n

Do<\/i><\/b><\/p>\n<\/td>\n

\n

Hvn<\/i><\/b><\/p>\n<\/td>\n

\n

Do<\/i><\/b><\/p>\n<\/td>\n

\n

Hvn<\/i><\/b><\/p>\n<\/td>\n

\n

Do<\/i><\/b><\/p>\n<\/td>\n

\n

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

L\u1eb7p 1<\/b><\/td>\n\n

1,87<\/p>\n<\/td>\n

\n

183<\/p>\n<\/td>\n

\n

1,72<\/p>\n<\/td>\n

\n

170<\/p>\n<\/td>\n

\n

1,60<\/p>\n<\/td>\n

\n

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

L\u1eb7p 2<\/b><\/td>\n\n

1,86<\/p>\n<\/td>\n

\n

187<\/p>\n<\/td>\n

\n

1,70<\/p>\n<\/td>\n

\n

171<\/p>\n<\/td>\n

\n

1,60<\/p>\n<\/td>\n

\n

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

L\u1eb7p 3<\/b><\/td>\n\n

1,87<\/p>\n<\/td>\n

\n

182<\/p>\n<\/td>\n

\n

1,70<\/p>\n<\/td>\n

\n

170<\/p>\n<\/td>\n

\n

1,60<\/p>\n<\/td>\n

\n

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

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

1,87<\/b><\/p>\n<\/td>\n

\n

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

\n

1,71<\/b><\/p>\n<\/td>\n

\n

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

\n

1,60<\/b><\/p>\n<\/td>\n

\n

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

Sai ti\u00eau chu\u1ea9n (S^2)<\/b><\/td>\n0,283<\/b><\/td>\n28,319<\/b><\/td>\n0,251<\/b><\/td>\n26,43<\/b><\/td>\n0,195<\/b><\/td>\n16,242<\/b><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

4. K\u1ebft lu\u1eadn<\/b><\/p>\n

1.<\/b> V\u00f9ng Thanh S\u01a1n \u2013 Ph\u00fa Th\u1ecd v\u00e0 Th\u01b0\u1ee3ng Ti\u1ebfn \u2013 Ho\u00e0 B\u00ecnh l\u00e0 2 trong nh\u1eefng trung t\u00e2m ph\u00e2n b\u1ed1 c\u1ee7a c\u00e2y Ch\u00f2 ch\u1ec9 \u1edf ph\u00eda B\u1eafc.<\/p>\n

2.<\/b> \u0110\u1eb7c \u0111i\u1ec3m v\u1ec1 l\u00e2m ph\u1ea7n c\u00f3 Ch\u00f2 ch\u1ec9 ph\u00e2n b\u1ed1.<\/p>\n

–\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 T\u1ed5 th\u00e0nh lo\u00e0i c\u00e2y g\u1ed7: S\u1ed1 l\u01b0\u1ee3ng c\u00e1c c\u00e1 th\u1ec3 c\u1ee7a Ch\u00f2 chi\u1ebfm t\u1eeb 2,6 \u2013 4,5%.<\/p>\n

–\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 T\u1ed5 th\u00e0nh theo ti\u1ebft di\u1ec7n ngang: Ch\u00f2 ch\u1ec9 chi\u1ebfm t\u1eeb 2,5 \u2013 3,2% t\u1ed5ng G v\u00e0 m\u1ee9c \u0111\u1ed9 \u01b0u th\u1ebf ch\u1ec9 \u1edf m\u1ee9c \u0111\u1ed9 trung b\u00ecnh \u0111\u1ebfn trung b\u00ecnh kh\u00e1<\/p>\n

–\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0C\u1ea5u tr\u00fac t\u1ed5 th\u00e0nh theo tr\u1eef l\u01b0\u1ee3ng t\u1eeb 12,5 m3\/ha – 19,70 m3\/ha (TB).<\/p>\n

–\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0Ch\u00f2 ch\u1ec9 c\u00f3 c\u1ea5u tr\u00fac m\u1eadt \u0111\u1ed9 th\u1ea5p nh\u01b0ng c\u00f3 \u01b0u th\u1ebf v\u1ec1 di\u1ec7n t\u00edch t\u00e1n<\/p>\n

–\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Ch\u00f2 ch\u1ec9 t\u00e1i sinh ch\u1ee7 y\u1ebfu b\u1eb1ng h\u1ea1t.<\/p>\n

–\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0M\u1eadt \u0111\u1ed9 t\u00e1i sinh th\u1ea5p nh\u1ea5t trong l\u00e2m ph\u1ea7n v\u00e0 ph\u00e2n b\u1ed1 theo c\u1ee5m\/\u0111\u00e1m.<\/p>\n

3<\/b>. T\u1ef7 l\u1ec7 ph\u00e2n b\u00f3n NPK ph\u00f9 h\u1ee3p cho c\u00e2y con Ch\u00f2 ch\u1ec9 \u1edf giai \u0111o\u1ea1n v\u01b0\u1eddn \u01b0\u01a1m l\u00e0 1:4:3 (0,29g N : 0,95g P : 0,23g K)<\/p>\n

4.<\/b> C\u01b0\u1eddng \u0111\u1ed9 chi\u1ebfu s\u00e1ng 50% \u00e1nh s\u00e1ng t\u1ef1 nhi\u00ean l\u00e0 th\u00edch h\u1ee3p nh\u1ea5t cho sinh tr\u01b0\u1edfng c\u1ee7a c\u00e2y con Ch\u00f2 ch\u1ec9 giai \u0111o\u1ea1n v\u01b0\u1eddn \u01b0\u01a1m.<\/p>\n

5.<\/b> C\u00e2y con Ch\u00f2 ch\u1ec9 giai \u0111o\u1ea1n v\u01b0\u1eddn \u01b0\u01a1m \u0111\u00e3 sinh tr\u01b0\u1edfng t\u1ed1t nh\u1ea5t khi \u0111\u1ed9 \u1ea9m \u0111\u1ea5t b\u1ea7u \u0111\u1ea1t kho\u1ea3ng 25,35%.<\/p>\n

6.<\/b> S\u1eed d\u1ee5ng NPK theo c\u00f4ng th\u1ee9c N1P2K1 ( 1,5g N + 3,0g P + 1,5g K) L\u00e0 t\u1ed1t nh\u1ea5t cho sinh tr\u01b0\u1edfng v\u00e0 bi\u1ec3u hi\u1ec7n v\u1ec1 h\u00ecnh th\u00e1i.<\/p>\n

7<\/b>. T\u1ef7 l\u1ec7 n\u1ea3y m\u1ea7m c\u1ee7a h\u1ea1t = 45%. T\u1ef7 l\u1ec7 s\u1ed1ng c\u1ee7a c\u00e2y sau khi ra b\u1ea7u 1 th\u00e1ng \u0111\u1ea1t > 80%. v\u00e0 c\u00f3 th\u1ec3 t\u1ea1o gi\u1ed1ng Ch\u00f2 ch\u1ec9 b\u1eb1ng gi\u00e2m hom v\u1edbi c\u00e1c ch\u1ea5t k\u00edch th\u00edch sinh tr\u01b0\u1edfng l\u00e0 IBA v\u00e0 IAA n\u1ed3ng \u0111\u1ed9 0,5 \u2013 1%.<\/p>\n

8.<\/b> Tr\u1ed3ng Ch\u00f2 ch\u1ec9 thu\u1ea7n lo\u00e0i ho\u1eb7c h\u1ed7n giao v\u1edbi S\u1ea5u\/Re (N=540) \u0111\u1ed3ng th\u1eddi b\u00f3n l\u00f3t 30g N + 120g P + 90g K v\u00e0 b\u00f3n th\u00fac 200g NPK t\u1ed5ng h\u1ee3p s\u1ebd mang l\u1ea1i hi\u1ec7u qu\u1ea3 cao nh\u1ea5t khi tr\u1ed3ng \u1edf n\u01a1i c\u00f3 \u0111\u1ed9 \u1ea9m cao.<\/p>\n

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

1. \u0110\u01b0\u1eddng H\u1ed3ng D\u1eadt (2002), C\u1ea9m nang ph\u00e2n b\u00f3n. NXB H\u00e0 N\u1ed9i.<\/p>\n

2. GEF (2002), D\u1ef1 \u00e1n X\u00e2y d\u1ef1ng m\u00f4 h\u00ecnh c\u1ed9ng \u0111\u1ed3ng ph\u1ee5c h\u1ed3i v\u00e0 ph\u00e1t tri\u1ec3n c\u00e2y Ch\u00f2 ch\u1ec9 t\u1ea1i Thanh S\u01a1n \u2013 Ph\u00fa Th\u1ecd.<\/p>\n

3. <\/b>\u00a0Ho\u00e0ng Minh Ch\u00e2u,1998. C\u1ea9m nang s\u1eed d\u1ee5ng ph\u00e2n b\u00f3n \u2013 Hi\u1ec7p h\u1ed9i ph\u00e2n b\u00f3n qu\u1ed1c t\u1ebf. Trung t\u00e2m Th\u00f4ng tin Khoa h\u1ecdc K\u1ef9 thu\u1eadt Ho\u00e1 ch\u1ea5t.<\/p>\n

4. Ho\u00e0ng Th\u1ecb H\u00e0, 1996. Dinh d\u01b0\u1ee1ng kho\u00e1ng \u1edf th\u1ef1c v\u1eadt. NXB \u0110\u1ea1i h\u1ecdc Qu\u1ed1c gia. H\u00e0 N\u1ed9i.<\/p>\n

5. Nguy\u1ec5n \u0110\u1ee9c Minh, Nguy\u1ec5n Th\u1ecb Thu H\u01b0\u01a1ng, \u0110o\u00e0n \u0110\u00ecnh Tam (2004), Nghi\u00ean c\u1ee9u x\u00e1c \u0111\u1ecbnh nhu c\u1ea7u dinh d\u01b0\u1ee1ng kho\u00e1ng N, P, K v\u00e0 ch\u1ebf \u0111\u1ed9 n\u01b0\u1edbc c\u1ee7a m\u1ed9t s\u1ed1 d\u00f2ng Keo lai (A. Mangium v\u00e0 A.auriculaformis)<\/i> v\u00e0 B\u1ea1ch b\u00e0n Urophylla<\/i> \u1edf giai \u0111o\u1ea1n r\u1eebng non v\u00e0 v\u01b0\u1eddn \u01b0\u01a1m.<\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

\u0110o\u00e0n \u0110\u00ecnh Tam \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 1. \u0110\u1eb7t v\u1ea5n \u0111\u1ec1 Lo\u00e0i Ch\u00f2 ch\u1ec9 (Parashorea chinensis Wang Hsie) c\u00f2n c\u00f3 t\u00ean g\u1ecdi l\u00e0 M\u1ea1y kho, thu\u1ed9c h\u1ecd D\u1ea7u (Dipterocarpaceae) ng\u00e0nh M\u1ecdc lan ( Mag noliophyta), h\u1ea1t k\u00edn (Angiospermae) l\u00e0 lo\u00e0i c\u00e2y c\u00f3 gi\u00e1 tr\u1ecb kinh t\u1ebf cao thu\u1ed9c ph\u00e2n nh\u00f3m ch\u00ednh nh\u00f3m ba, l\u00e0 lo\u00e0i c\u00e2y g\u1ed7 l\u1edbn, […]<\/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\/14521"}],"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=14521"}],"version-history":[{"count":3,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/14521\/revisions"}],"predecessor-version":[{"id":14532,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/14521\/revisions\/14532"}],"wp:attachment":[{"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/media?parent=14521"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/categories?post=14521"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/tags?post=14521"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}