Nghiên cứu sản xuất phân sinh học đa chủng bón cho lúa cao sản, bắp lai, mía đường và nhóm trong tỉnh Hậu Giang

KY Y E U C A C D E TAI, D U A N N G H I E N C L f U KHOA H O C & C O N G N G H E<br /> <br /> <br /> DE TAI:<br /> <br /> NGHIEN CLfU SAN XUAT PHAN SINH HOC DA CHUNG<br /> <br /> BON CHO LUA CAO SAN, BAP LAI, MIA DUdNG VA KHOM<br /> <br /> TRONG TINH HAU GIANG<br /> <br /> <br /> Ca quan chu tri: Vien Cong nghe sinh hoc - Dai hoc Can Tho*<br /> CM nhiem de tdi: P G S . T s . C a o N g o c D i e p<br /> Thdi gian thuc hien: 10/2005 - 3/2007<br /> <br /> <br /> I. DAT VAN DE:<br /> N g a y nay, v i e c su" d u n g phan d a m hoa hoc qua n h i e u se l a m gia t a n g ltfOng nitrat trong ntfdc<br /> ngam, hOn ntfa gia phan hda hoc l a i k h o n g n g t f n g t a n g l e n nhtfng h i e u qua stf d u n g l a i thap. M o t<br /> trong n h t f n g p h t f d n g phap g i a i q u y e t v a n de t r e n la l a m sao de' c a i t h i e n dat t r o n g cd n h i e u n i t d hdn<br /> va phtfdng each n a y cd t i n h kha t h i hdn b a n g each stf d u n g cac v i k h u a n v u n g re k i c h t h i c h stf tang<br /> trtfdng. O n g h i e n c t f u nay stf d u n g n h f f n g d d n g v i k h u a n cd ich la Gluconacetobacter diazotrophicus<br /> va Pseudomonas spp de' san xuat phan sinh hoc da c h u n g cho t f f n g l o a i cay t r d n g nhff bap, lua cao<br /> san, k h o m , m i a .<br /> II. M U C TIEU, N O I D U N G V A P H U d N G PHAP N G H I E N CU"U:<br /> 1. M u c t i e u c u a d e t d i :<br /> - Stf d u n g n h f f n g d d n g v i k h u a n cd i c h la Gluconacetobacter diazotrophicus va Pseudomonas spp<br /> de san x u a t p h a n sinh hoc da c h u n g cho t f f n g l o a i cay t r o n g .<br /> - D a n h gia h i e u qua phan sinh hoc da n a n g d i e u k i e n ngoai d d n g de' t i n h h i e u qua k i n h te' so<br /> sanh v d i p h a n hda hoc.<br /> 2. N d i d u n g n g h i e n c t f u :<br /> - T h i n g h i e m p h a n sinh hoc t r e n bap l a i ( G i o n g G-49)<br /> - T h i n g h i e m p h a n sinh hoc t r e n lua cao san ( G i o n g O M 3536)<br /> - T h i n g h i e m p h a n sinh hoc t r e n k h o m ( k h o m Q u e e n )<br /> - T h i n g h i e m p h a n sinh hoc t r e n m i a d f f d n g ( Gid'ng M i a D L M 24, R 570, V D 86-368)<br /> 3. P h U d n g p h d p n g h i e n c t f u :<br /> T r f f d c k h i t h i n g h i e m , da't se thu theo h i n h c h e o (5 d i e m ) , d d d sau t f f 0 d e n 15 c m ( l d p da't m a t ) ,<br /> trdn d e u va l a y 1 phan ( k h o a n 0,5 k g ) p h d i k h d trong mat, dap nhd qua ray 2 m m de do p H , N t d n g<br /> sd', P de t i e u , K trao d d i , Chat h f f u c d ; Sau k h i t h i n g h i e m , dat c u n g thu nhff da t r i n h bay d phan t r e n<br /> trong tat ca cac n g h i e m thtfc [20 l d ] , n h f f n g c h i p h a n tich N tdng sd va P de t i e u .<br /> - T h i n g h i e m phan sinh hoc t r e n bap lai (Gid'ng G-49) : t h i n g h i e m cd 5 n g h i e m thffc, 4 lan lap l a i<br /> v d i 20 l d , d i e n tich 25 m / l d , d i e n tich can stf d u n g 750 m " bao g o m ca m f f d n g d a n va thoat n f f d c ; t h i<br /> 2<br /> <br /> <br /> <br /> <br /> n g h i e m t h f f c h i e n trong 1 v u t a i 2 dia d i e m trong m o t h u y e n de d a n h gia c h i n h xac. G o m cac<br /> nghiem thffc:<br /> + N T 1 : D d i chung<br /> + N T 2 : B d n 180 k g N - 90 k g P 0 : 5 /ha<br /> + N T 3 : B d n 100 kg phan sinh hoc/ha<br /> <br /> <br /> <br /> 83<br /> KY Y E U C A C B E TAI, D U A N N G H I E N C L / U K H O A H O C & C O N G N G H E<br /> <br /> <br /> + N T 4 : B o n 100 k g p h a n sinh hoc/ha + 60 k g N / h a<br /> + N T 5 : B o n 100 k g p h a n sinh hoc/ha + 60 k g N / h a + 100 l i t d i c h l e n m e n / h a @<br /> @ d i c h l e n m e n v i sinh vat tong hop I A A t u o i 3 l a n / v u cho bap<br /> - T h i n g h i e m phan sinh hoc t r e n l u a cao san ( G i o n g O M 3536) : t h i n g h i e m co 5 n g h i e m thu'c, 4<br /> lan l a p l a i v d i 20 l d , d i e n t i c h 20 m / l d , d i e n t i c h c a n su" d u n g 650 m<br /> 2 2<br /> bao g o m ca mUOng dan va<br /> thoat ntfdc; t h i n g h i e m thtfc h i e n trong 2 v u l i e n tie'p de' d a n h gia c h i n h xac. G o m cac n g h i e m thu'c:<br /> + N T 1 : B d i chung<br /> + N T 2 : B d n 100 k g N - 60 k g P 0 2 5 /ha<br /> + N T 3 : B d n 100 k g phan sinh hoc/ha<br /> + N T 4 : B d n 100 k g phan sinh hoc/ha + 20 k g N / h a<br /> + N T 5 : B d n 100 k g phan sinh hoc/ha + 20 k g N / h a + 100 l i t d i c h l e n m e n / h a @<br /> @ d i c h l e n m e n v i sinh vat tdng hop I A A t u d i 3 l a n / v u cho l u a .<br /> - T h i n g h i e m phan sinh hoc t r e n k h o m ( n h o m Q u e e n ) : t h i n g h i e m c d 5 n g h i e m thtfc, 4 l a n lap lai<br /> v d i 20 l d , d i e n t i c h 50 m71d, d i e n t i c h c a n stf d u n g 1.500 m " bao g o m ca mtfOng d a n va thoat ntfdc;<br /> t h i n g h i e m thtfc h i e n trong 1 v u trong sud't 10 hay 11 thang de d a n h g i a c h i n h xac. G o m cac nghiem<br /> 9<br /> <br /> <br /> <br /> <br /> thtfc:<br /> + N T 1 : B d i chung<br /> + N T 2 : B d n 4g ure, 2 g supe l a n , 4 g KC1 cho m d i gdc k h o m<br /> + N T 3 : B d n 50 g phan sinh hoc/gdc k h o m<br /> + N T 4 : B d n 50 g phan sinh hoc + 2 g ure, 1 g supe l a n , 2 g K C l / g d c k h o m<br /> + N T 5 : B d n 5 0 k g phan sinh hoc + 2g ure, l g supe l a n , 2g K C l / g d c k h o m + 0,2 l i t d i c h l e n men/Ian<br /> tudi @<br /> @ d i c h l e n m e n v i sinh vat tdng hop I A A t u d i 3 lan/vu cho k h o m<br /> - T h i n g h i e m phan sinh hoc t r e n m i a d t f d n g (Gid'ng M i a B L M 24, R 5 7 0 , V B 86-368 do Cong ty<br /> M i a d t f d n g C a n T h d k h u y e n cao va cung cap): t h i n g h i e m cd 5 n g h i e m t h t f c , 4 l a n l a p l a i v d i 20 16,<br /> d i e n t i c h 50 m71d, d i e n tich can stf d u n g 1.500 m bao g o m ca m t f d n g d a n va thoat ntfdc; t h i nghiem<br /> 2<br /> <br /> <br /> <br /> <br /> thtfc h i e n trong 1 v u trong sud't 10 hay 11 t h a n g de' d a n h gia c h i n h xac. G o m cac n g h i e m thtfc:<br /> + N T 1 : B d i chtfng<br /> + N T 2 : B d n 200 kg N - 90 k g P Os /ha<br /> 2<br /> <br /> <br /> <br /> + N T 3 : B d n 100 k g phan sinh hoc/ha<br /> + N T 4 : B d n 100 k g phan sinh hoc/ha + 50 k g N / h a<br /> + N T 5 : B d n 100 k g phan sinh hoc/ha + 50 k g N / h a + 100 l i t d i c h l e n m e n / h a @<br /> @ d j c h l e n m e n v i sinh vat tdng hop I A A t u d i 3 lan/vu cho l u a .<br /> - So l i e u t h i n g h i e m dtfdc phan tich thd'ng ke theo chtfdng t r i n h E X C E L 2003, cac t r i trung binh<br /> se dtfdc t r i n h bay t r e n cac b a n g hay do t h i ( E x c e l ) v d i chu t h i c h p h a n k h a c b i e t nhd nhat cd y nghia<br /> nhtf L S B 5 9 r hay k i e m d i n h B u n c a n .<br /> III. KET Q U A N G H I E N C L / U :<br /> 1. B a p l a i :<br /> B e tai t i e n hanh n g h i e n c t f u d 4 d i e m : thi tran M o t N g a n va xa N h d n N g h i a A ( h u y e n Chau<br /> T h a n h A ) : xa H d a M y va xa Phung H i e p ( h u y e n Phung H i e p )<br /> Qua n g h i e n c t f u cho thay. h i e u qua b d n 100 k g phan sinh hoc b d sung 60 k g N/ha va 100 l i t dich<br /> vi k h u a n cho nang suat k h o n g khac biet y nghia thd'ng ke d d i v d i bap bdn phan hda hoc ( 1 8 0 kg N -<br /> <br /> <br /> 84<br /> KY Y E U C A C B E TAI, D U A N N G H I E N C L / U KHOA H O C & C O N G NGHE<br /> <br /> <br /> 90 kg P 07ha), neu so vdi luc ban dau chua trong thi ham ltfOng N tdng sd va P de tieu cao hOn luc<br /> 2<br /> <br /> <br /> <br /> ban d a u m a c du gitfa cac n g h i e m thtfc k h o n g co stf khac b i e t y nghia. B i e u nay cho t h a y , b o n p h a n<br /> sinh hoc k h o n g l a m suy t h o a i h a m ltfOng cac chat trong dat ma v a n d a m bao nang suat hat bap.<br /> B a n g 1. Hieu qua phan sinh hoc vd phan hod hoc tren cdy bdp lai (G.49) trong tren ddt phu sa<br /> tinh Hau Giang nam 2006 (trung binh cua 4 thi nghiem d 4 dia diem trong tinh)<br /> <br /> Trong<br /> C h i e u cao Chieu dai Chieu sd'hot<br /> Nghiem ltfdng T I . 100 h o t<br /> cay trai hoanh trai /trai<br /> thtfc trai (g)<br /> (cm) (cm) (cm)<br /> (g)<br /> NT 1 164,76 11,12 11,64 56,41 220,63 16,91<br /> NT 2 224,60 18,11 13,98 126,53 474,94 23,35<br /> <br /> NT 3 184,23 13,68 12,76 82,69 290,81 20,52<br /> <br /> NT 4 208,94 15,88 13,67 107,71 405,50 23,06<br /> NT 5 216,11 17,43 13,80 117,15 436,00 23,16<br /> <br /> F tmh ** ** ** ** **<br /> <br /> LSD.05 15,88 2,95 0,79 19,51 86,27 3,41<br /> <br /> C.V 5,16% 12,54% 3,9% 12,91% 15,31% 10,35%<br /> <br /> 2. L u a c a o san:<br /> B i e m t h i n g h i e m : xa T a n T h u a n h u y e n C h a u T h a n h A , t h i tran N a n g M a u , h u y e n V i T h i i y .<br /> T o n g k e t 4 t h i n g h i e m tai 2 dia d i e m t r e n cho thay t h a n h phan n a n g suat lua d n g h i e m thtfc co<br /> bon p h a n hoa hoc cao nhat, trong do stf khac b i e t d a n g ke la sd' b o n g l u a / b u i . K e d e n la n g h i e m<br /> thtfc b o n p h a n sinh hoc b d sung 20 k g N / h a va 100 l i t d i c h v i k h u a n . T u y n h i e n , tdng l t f d n g p r o t e i n<br /> trong gao ciia 2 n g h i e m thtfc k h o n g k h a c b i e t y nghia. B i e u nay cho thay p h a n sinh hoc v d i n h f f n g<br /> dong v i k h u a n huy d o n g d f f d n g chat c u n g cap cho cay lua n h f f n g k h o n g l a m anh h f f d n g d e n dinh<br /> dffdng ciia dat.<br /> B a n g 2. Hieu qua phan sinh hoc va phan hoa hoc tren cay lua cao sdn (OM 3536) trong tren ddt<br /> phii sa trong tinh Hau Giang [trung binh cua 4 thi nghiem]<br /> <br /> C h i e u cao Chieu dai sd'hot so' b o n g TL.1000 H a m ltfdng protein<br /> Nghiem<br /> cay lua bong lua chac lua hot lua t r o n g gao<br /> thtfc<br /> (cm) (cm) /bong lua /bui (g) (%)<br /> <br /> NT 1 74,65 17,19 43,75 2,30 25,64 6,171<br /> <br /> NT 2 90,08 21,77 72.74 3,95 26,35 6,671<br /> <br /> NT 3 74,38 17,43 43,73 2,55 25,63 6,521<br /> <br /> NT 4 82.38 19.75 57,67 2.94 26,08 6,431<br /> <br /> NT 5 86,23 21.27 71,08 3,18 26,34 6,440<br /> <br /> F tinh ** n.s<br /> <br /> LSD.05 5,93 2,13 12,17 0,42 0,39 -<br /> <br /> C.V 4,72 7,08 13,88 9,23 0,96 4,82<br /> <br /> <br /> <br /> 85<br /> KY Y E U C A C B E TAI, D U A N N G H I E N C P U K H O A H O C & C O N G N G H E<br /> <br /> <br /> 3. K h o m : ^ ^ ^ ^<br /> D i a d i e m t h i n g h i e m xa H o a T i e n (nha o n g D a n g , nha o n g V a n ) | |<br /> xa H o a L t f u (nha o n g Sen, nha o n g V o ) .<br /> T o n g ket trung hinh 4 thi n g h i e m k h o m t a i t h i xa V i T h a n h cho H S ^ - '<br /> thay b o n phan hoa hoc va p h a n sinh hoc l a m t a n g c h i e u d a i t r a i<br /> dirdng k i n h t r a i va t r o n g l t f d n g t r a i k h o m so v d i d d i c h d n g k h o n g ^ V-/<br /> bdn phan. T u y n h i e n , p h a n b d n sinh hoc t a n g d d B r i x c i i a t r a i k h o m ^V'J^L<br /> cd y nghia t h o n g k e so v d i k h o m c h i b d n p h a n hda hoc hay k h o n g H m h 1 5 T o d n ><br /> cc mh C l i a g<br /> m t fh ><br /> b d n phan ( d d i chd'ng). D i e u n a y cho thay, p h a n sinh hoc c a i t h i e n nghiem Khom d xa Hod Luu, thi<br /> chat l t f d n g t r a i k h o m , b d n p h a n sinh hoc b d sung t h e m p h a n ntfa - ' -'<br /> V£ v T h a n h<br /> <br /> <br /> <br /> <br /> ltfOng phan hda hoc va 100 l i t v i k h u a n cho n a n g suat k h o m t r a i<br /> cao nhat so v d i dd'i c h t f n g n h t f n g k h o n g a n h h t f d n g d e n ltfOng N va P t r o n g da't.<br /> B a n g 3. Hieu quid ciia phan sinh hoc va phan hda hoc tren thdnh phan ndng suat vd do Brix ciia trdi Khom<br /> trong tren dot phen trong thixa Vi Thanh (trung hinh 4 TN)<br /> <br /> Dtfdng Trpng<br /> C h i e u cao<br /> Nghiem kinh trai ltfOng t r a i Do<br /> trai khom<br /> khom khom Brix<br /> thtfc<br /> (cm)<br /> (cm) (kg)<br /> <br /> Dd'i c h t f n g 18,30 10,32 1,083 11,470<br /> <br /> 4 g ure, 2 g l a n , 4 g kali/gd'c 18,96 10,81 1,165 11,427<br /> <br /> 50 g phan sinh hoc/gd'c 19,09 10,70 1,182 11,895<br /> <br /> 50 g phan sinh hoc + 2 g ure, 1 g l a n , 2<br /> 19,24 10,64 1,190 11,981<br /> g kali/gd'c<br /> <br /> 50 g phan sinh hoc + 2 g ure, 1 g l a n , 2<br /> 19,39 10,69 1,234 12,293<br /> g k a l i + 0,2 lit/gd'c<br /> <br /> LSD.05 0,30 0,32 0,038 0,423<br /> <br /> CV(%) 1,05 2,01 2,19 2,42<br /> <br /> 4. M i a d t f d n g :<br /> D i a d i e m t h i n g h i e m : xa H i e p H t f n g , t h i t r a n C a y DtfOng, h u y e n P h u n g H i e p ; xa H d a T i e n , TX<br /> V i T h a n h ; xa V i n h V i e n , h u y e n L o n g M y .<br /> K e t qua t d n g hop ttf 4 t h i n g h i e m danh gia h i e u qua phan sinh hoc d 4 d i e m t r d n g m i a trong tinh<br /> H a u G i a n g cho thay b d n 100 k g p h a n sinh hoc b d sung 50 k g N / h a ( c h i b a n g A ltfOng phan dam X<br /> <br /> <br /> <br /> <br /> k h u y e n cao) va cd t t f d i t h e m d i c h v i k h u a n l e n m e n hay k h o n g d e u cho n a n g suat va tdng ltfdng<br /> d t f d n g k h o n g thua n g h i e m thtfc m i a c h i b d n p h a n d a m va l a n h d a hoc. D i e u n a y cho thay, trong dat<br /> phii sa d t i n h H a u G i a n g . ltfOng p h a n d a m t i e t k i e m hay c h i stf d u n g b a n d a u i t . N h t f v a y , bdn phan<br /> sinh hoc t i e t k i e m dtfdc 150 k g N va 90 k g P 0 / h a , gia t h a n h c a y m i a c d the ha x u o n g n h i e u lan va<br /> 2 5<br /> <br /> <br /> <br /> n d n g d a n cd the thu nhap cao hOn. D i e u quan t r o n g la stf t a n d u n g chat t h a i m i i n m i a ciia nha may<br /> d t f d n g l a m chat m a n g cho v i k h u a n sd'ng va phat t r i e n trong d o . Stf h o a n tra p h e ' p h a m c i i a cay mia<br /> sau k h i c h e ' b i e n la b i e n p h a p k i n h t e ' k h o n g n h f f n g g i i i p cho nha m a y g i a i q u y e t chat t h a i de khong<br /> bi d n h i e m m d i t r f f d n g d d n g t h d i t a n d u n g l a m p h a n b d n sinh hoc cho c h i n h c a y m i a d f f d n g .<br /> <br /> <br /> <br /> 86<br /> KY Y E U C A C DE TAI, D U A N N G H I E N CUU K H O A H O C & C O N G N G H E<br /> <br /> <br /> B a n g 4. Hieu qua cua phan sinh hoc va phan hda hoc tren thanh phan ndng suat va do Brix cua cay mia<br /> dudng trong tren ddi phu sa trong tinh Hau Giang (TB 4 thi nghiem)<br /> Chieu Dtfdng Trong<br /> So c a y<br /> cao c a y k i n h cay lu'o'ng 1 Do<br /> N g h i e m thu'c mia/ ,<br /> mia mia cay mia Brix<br /> 40 m 2<br /> <br /> <br /> (m) (cm) (kg)<br /> D o i c h f f n g ( k h o n g b o n p h a n N va P) 3,10 257,88 2,47 1,42 18;66<br /> 200 k g N + 90 k g P 0 / h a 2 5 3,28 308,39 2,58 1,77 19,99<br /> 100 k g p h a n sinh hoc/ha 3,03 271,00 2,55 1,56 19,15<br /> 100 k g p h a n sinh hoc/ha + 50 k g N / h a 3,24 296,60 2,56 1,71 19,43<br /> 100 k g phan sinh hoc/ha + 50 k g N / h a +<br /> 3,22 305,21 2,57 1,77 20,10<br /> 100 l i t d i c h v i k h u a n l e n m e n<br /> LSD.05 n.s 17,37 n.s 0,13 n.s<br /> F tmh - ** - ** -<br /> <br /> CV(%) 4,21 5,76 3,97 5,49 4,61<br /> <br /> 5. L d i n h u d n tCf stf t i e t k i e m p h d n b d n :<br /> a. Bap lai: V d i k e t qua 4 t h i n g h i e m trong t i n h H a u G i a n g , n a n g suat bap l a i ( g i o n g G 4 9 ) cd b d n<br /> 180 k g N / h a va 60 k g P2O5 ttfOng dtfOng v d i n a n g suat l d b d n 100kg phan sinh hoc + 60 k g N nhtf<br /> vay t i e t k i e m dtfOc 120 k g N va 60 k g P2O5 ttfOng dtfOng v d i 260,87 k g ure va 4 0 0 k g p h a n l a n supe<br /> tdng c o n g la 1.653.915d<br /> b. Lua cao sdn: K e t qua t h i n g h i e m lua cao san d h u y e n Chau T h a n h A va h u y e n V i T h i i y cho thay<br /> nghiem thtfc b d n 100 k g N/ha - 60 k g P 05/ha cd nang suat ttfOng dtfOng v d i nghiem thtfc bdn 100 k g<br /> 2<br /> <br /> <br /> <br /> phan sinh hoc + 20 k g N/ha nen ndng dan tiet k i e m dtfOc 80 k g N/ha - 60 k g P 0 / h a . T o n g chi p h i la 2 5<br /> <br /> <br /> 1.557.000d trtf d i 220.000d t i e n phan sinh hoc va dich v i khuan l e n m e n tiet k i e m dffdc 1.457.000d<br /> c. Mia dudng: T o n g k e t 4 t h i n g h i e m m i a d t f d n g trong t i n h H a u G i a n g cho thay n g h i e m thtfc b d n<br /> 200 k g N / h a - 90 k g P Os cho m i a d t f d n g cd nang suat va t d n g ltfOng d t f d n g ttfOng dtfOng v d i n g h i e m<br /> 2<br /> <br /> <br /> thtfc b d n 100 k g p h a n sinh hoc + 50 k g N / h a n e n n d n g d a n cd the t i e t k i e m d f f d c 150 k g N - 90 k g<br /> P 0 . N h t f v a y n d n g d a n t i e t k i e m d f f d c sd' t i e n la 2.660.000d trtf d i 200.000d t i e n p h a n sinh hoc va<br /> 2 5<br /> <br /> <br /> dich v i k h u a n l e n m e n , n d n g d a n t i e t k i e m d f f d c 2.460.000d<br /> d. Khom: T m n g b i n h 4 t h i n g h i e m d 2 xa H d a L t f u va H d a T i e n cho thay n g h i e m thtfc b d n 50 g<br /> phan sinh hoc/gd'c ttfOng dtfOng v d i n g h i e m thtfc b d n 4 g ure + 1 g l a n + 4 g kali/gd'c n e n n d n g d a n<br /> tiet k i e m d f f d c 1.120.000d<br /> IV. KET L U A N V A K I E N N G H h<br /> 1. K e t l u d n :<br /> Qua n h f f n g k e t qua t h i n g h i e m t r i n h b a y d phan t r e n , c h u n g t d i r i i t ra n h f f n g k e t l u a n sau:<br /> - B d n 100 k g phan sinh hoc va 60 k g N / h a (cd the b d sung d i c h v i k h u a n l e n m e n hay k h o n g ) cho<br /> nang suat bap hot tffOng d f f d n g bap b d n 180 k g N va 90 k g P 0 / h a . 2 5<br /> <br /> <br /> - B d n 100 k g phan sinh hoc + 20 k g N va 100 l i t v i k h u a n l e n men/ha cho cay lua cao san cd nang<br /> suat thap hOn lua bdn 100 k g N - 60 k g P 03/ha n h f f n g tdng l f f d n g protein trong gao/ha tffOng d f f d n g .<br /> 2<br /> <br /> <br /> <br /> - B d n 100 k g phan sinh hoc va 50 k g N / h a (cd the b d sung d i c h v i k h u a n l e n m e n hay k h o n g ) cho<br /> nang suat m i a cay va t d n g l f f d n g d f f d n g / h a t f f d n g d f f d n g v d i m i a b d n 2 0 0 k g N - 90 k g P 0 / h a .2 5<br /> <br /> <br /> <br /> - B d n 50 g phan sinh hoc/gd'c cho nang suat k h o m tffdng dffdng v d i bdn 4 g ure, 1 g lan va 4 g kali/gd'c.<br /> 2. K i e n n g h j :<br /> Cac cd quan chtfc nang tao d i e u k i e n tie'p tuc nghien ctfu sau hOn ve hieu qua phan sinh hoc tren lua<br /> cao san va k h o m d trong tinh H a u Giang nham t i m ra b i e n phap canh tac hieu qua va t d i ffu nhat."<br /> <br /> <br /> 87<br />