nghiên cứu thời vụ và các biện pháp kỹ thuật trồng bông năng suất cao phù hợp với các vùng đồi núi ở lai châu

BQ CONG THUDNG CONG TY CO PHAN BONG MI^N BAG BAO CAO TOMG K^r De tai: "NGHIEN ctru THdl VU VA CAC BI$N PHAP KY THUAT TRONG BONG NANG SUAT CAO PHU HOP V6l CAC VUNG DOI NUI 6 LAI CHAU" Thuc hien theo Hgp ddng sd 115.09 RD/HD-KHCN ky ngay 04 thing 03 nam 2009 giira Bd Cdng thuong va Cdng ty Co phan Bdng Miln Bac Ca quan chO tri: Cong ty Co phan Bong Mien Bac ChO nhiem de tai: KS. Phan Quoc Hien Can bo chinh tham gia thurc hien: KS. Nguyen Chi Thanh KTV. Nguyen Van Dinh KTV. Nguyen Van Trung Ha Noi, thing 12 nam 2009 :^^m MUC LUC • • Noi dung Trang Bieu thong tin 1 Phan 1: Dat van de 2 r F y 1.1. Tinh cap thiet cua de tii 2 1.2. Muc tieu ciia de tai 3 1.2.1. Muc tieu khoa hgc cdng nghe 3 1.2.2. Muc tieu kinh te xa hdi 3 1.3. Thdi gian va dia diem nghien cuu 4 Phan 2: Tong quan tai lieu 5 2.1. Nhimg nghien ciiu ve thdi vu gieo bdng 5 2.2. Nhumg nghien ciiu ve mat do gieo trdng 5 2.3. Nhimg nghien cuu ve lieu lugng phin bdn 8 2.4. Nhimg nghien cuu ve bien phip bim nggn tia cinh 9 2.5. Nhiing nghien cuu ve sir dung thudc trir cd tren cay bdng 10 2.6. NC va ap dung cic BP ky thuat tdng hgp trong canh tic bdng 11 Phan 3: Vat lieu, noi dung va phvong phap nghien ciru 13 3.1. Vat lieu nghien ciru 13 3.2. Noi dung nghien ciiu 14 3.3. Phuang phap nghien cuu 14 3.3.1. Thi nghiem 1 14 3.3.2. Thi nghiem 2 15 3.3.3. Thi nghiem 3 15 3.3.4. Thi nghiem 4 16 3.3.5. Thi nghiem 5 17 3.4. Cic chi tieu theo doi 18 3.5. Phuang phip canh tic trong thi nghiem 19 3.6. Phuang phip sii ly sd lieu 20 Phan 4: Ket qua nghien cihi va thao luan 21 4.1. Die diem thdi tiet khi hiu ciia Phong Tho - Lai Chau 21 4.2. NC inh hudng ciia thdi vu gieo din STPT vi ning suit VNO 1 -2 24 4.2.1. NC inh hudng ciia thdi vu gieo din STPT ciia gidng VNO 1 -2 24 4.2.2. Nghien cuu inh hudng ciia thdi vu gieo den siu benh hai 25 4.2.3. Cic yeu td cau thinh nang suit vi ning suat bdng VNO 1-2 26 F 4.3. Sii dung thudc diet cd trudc liic gieo bdng 28 4.4. Nghien ciiu inh hudng miic phin bdn den STPT bdng VNO 1-2 30 4.5. Nghien ciiu anh hudng ciia mat do gieo vi cich gieo 32 4.5.1. Nghien ciiu inh hudng ciia mat do gieo trong dieu kien gieo hing 33 4.5.2. Ngliien ciiu inh hudng ciia mat do gieo trong dieu kien gieo so le 35 4.6. De xuat mot sd bien phip ky thuit bd sung cho quy trinh ky thuit 39 sin xuat bdng nang suit cao tai Phong Thd - Lai Chau. Phan 5 : Ket luan va de nghi 41 5.1. Ket luan 41 5.2. Dl nghi 41 Phan 6: Tai lieu tham khao 42 A. Tii lieu Tiing Viet 42 B. Tii lieu Tieng nude ngoii 43 Phu luc 1: Mot sd ylu to khi tugng Mudng Lay thing 4-11/2009 Phu luc 2, 3, 4 Phu luc 5, 6, 7 F F Phu luc: Sd lieu phan tich dat BIEU THONG TIN 1. Ten de tii: Nghien cim thdi vu vd cdc bien phdp ky thudt trong bong ndng sudt cao phii hop viing ddi nid Lai Chau. 2. Ma sd: 3. Thdi gian thuc hien dl tai: Tir thing 01/2009 din hit thing 12/2009. 4. Hg va ten chii nhiem de tii: Phan Qudc Hien Hgc ham, hgc vi, chuyen mdn: Ky su ndng hgc Chiic vu: Phd Tdng Giim doc; Dien thoai: 04.39719514 5. Co quan chii tri: Cdng ty Cd phin Bdng Mien Bic Dia chi: Sd 6 Nguyen Cdng Tni - Hi Ndi; Dien thoai: 04.39722132 6. Kinh phi thuc hien: 250.000.000 ddng (Hai trim nam muai trieu ddng) 7. Danh sich nhiing ngudi thuc hien chinh Stt Hg vi ten Hgc him, hgc vi chuyen mdn 1- Phan Qudc Hien Ky su Ndng hgc 2- Nguyen Van Trung Ky su Ndng hgc 4- Nguyen Chi Thinh Ky su Ndng hgc 5- Nguyen Van Dinh Ky thuat vien 8. Muc tieu nghien cuu: Xic dinh mot sd bien phip ky thuit phii hgp trong sin xuat bdng tai viing niii Phong Thd gdp pin hoin thien qui trinh ky thuit tham canh bdng ning suit cao phii hgp vdi dieu kien dat dai vi trinh do canh tic vi tip quin cua ddng bio din tdc Lai Chau. 9. Ndi dung nghien ciiu: - Nghien ciiu inh hudng cua cic thdi vu gieo den den sinh trudng phit trien vi ning suit bdng lai VNOl-2. - Nghien ciiu inh hudng ciia cic bien phip ky thuit: xu ly thudc diet cd trudc khi gieo, mat do gieo, khoang cich gieo; lugng phin bdn den sinh trudng phit trien vi nang suit bdng VNOl-2. PHAN 1 DAT VAN DE 1.1. Tinh cap thiet ciia de tai Phong Tho li huyen mien niii nam d phia Tay cua tinh Lai Chau cd tdng dien tich dat tu nhien li 825,04 km , trong dd dat sin xuat ndng nghiep 65.119,01 ha chiem 78% dien tich dit tu nhien, cd tdng dan sd li 62.518 ngudi, mat do dan 76 ngudi/km (sd lieu nim 2008). Phong Thd la viing cd khi hiu die trung khd va ndng, cd dat dai phii hgp cho sin xuit ngd, diu do vi cay bdng vii. Phong Thd cd 17 xa 1 thi tran, nai cd cic dan tdc anh em cung chung song la F F Thai, Kinh, Kha mii, Dao vi Mdng. Trong do ngudi dan tdc Thii chiem da sd, vdn cd tinh can cu, chiu khd va cd truyen thdng trdng bdng det vii tir lau ddi. Trudc day ddng bio din tdc trdng gidng bdng cd dia phuang de tu tiic vii mac, \ 7 7 7 S chan man, quan io, det hing thd cim nhung hien nay do sin pham vii, quin io, chin min sin xuat nhieu, gii ci re phu hgp vdi tiii tien ciia ngudi ndng din va dugc van chuyen den bin khip mgi noi nen ngudi dan mua rat thuan tien. Mat khic, dong bao trdng giong bdng cd dia phuang cho ning suit thap 4-5 ta/ha, chit lugng xa khdng dim bio, chieu dii xa ngin (trung bmh chi dat 15-17 mm) khdng dip iing yeu cau cho che bien cdng nghiep, han niia gii ci thap nen sin xuit bdng dia phuang ngiy bi mai mot, dien tich ngay cing bi thu hep. y F F Nam 2007, Cdng ty Bdng mien Bac da dua cic gidng bdng lai VNI5, VNOl-2 trdng thu tai mot sd xa tren dia ban huyen Phong Thd, Than Uyen vdi dien tich 50 ha. Ket qui cay bdng sinh trudng phit trien tdt cho nang suit trung / t binh dat 13-14 ta/ha. Cdng ty da thu mua het toin bd sin pham kip thdi cho ba F F F y con, bdi vay ndng dan rat phan khdi, mong mudn md rgng dien tich trdng bdng. Ndng dan ndi chung va ngudi trdng bdng ndi rieng ludn mong muon cd dugc thu nhap cao tir cay trdng ciia minh. Trong nhiing nam gin day siic canh tranh ciia mot sd cay trong cimg thdi vu vdi cay bdng ngay cang manh, nhat la cay ngd lai. Vdi dieu kien khi hau thdi tiet phii hgp cho sinh trudng phit triln cua ciy bdng vi tiem ning dit dai khi ddi dao ci ve quy md dien tich vi do miu md (dat sin xuat ndng nghiep 65.119,01 ha), dd li nhimg dilu kien co bin cho phep md rgng viing sin xuat bdng tai Phong Thd. De sin xuit bdng tai Lai Chau ngiy cing md rgng vi phit trien thi viec nghien cuu cic bien phip ky thuit (mdi don giin, phii hgp vdi dilu kien, tip quin cua ddng bio dan tdc) lam cin cii khoa hgc bd sung hoin thien qui trinh sin xuat bdng cho vimg mien mii li het siic cin thilt. Xuit phit hi yeu ciu thuc tien tren, chiing tdi tiln hinh thuc hien dl tii "Nghien ciru thdi vu vd cdc bien phdp ky thudt trdng bdng ndng sudt cao phii hap vdi viing ddi niii Lai Chdu " 1.2. Muc tieu cua de tai 1.2.1. Muc tieu khoa hpc cong nghe Xac dinh mot sd bien phip ky thuat phu hgp trong sin xuit bdng tai viing mil Phong Thd gdp phan hoan thien quy trinh ky thuat tham canh bdng nang F y F > suit cao phu hgp vdi dieu kien dit dai, trinh do canh tic vi tip quin cua ddng bao dan tdc tinh Lai Chiu. 1.2.2. Muc tieu kinh te - xd hoi - Tren ca sd ket qui nghien ciiu cic giii phip ky thuit ap dung vio sin xuat se gdp phan nang cao ning suit, hieu qui kinh te cua cay bdng, tir dd khuyen khich ndng din manh dan trdng bdng, thiic day viec md rgng dien tich F vi ting sin lugng bdng xo cung cap cho nginh cdng nghiep Det - May trong nude. - Giiip ndng dan mien niii Phong Thd - Lai Chiu cd ca hdi tiep can vdi nhimg bien phip ky thuit mdi trong tham canh bdng ndi rieng vi ciy trdng ndng F F nghiep ndi chung, trang bi cho ndng din kien thiic vi kinh nghiem sin xuat, tren F y F y ca sd do ngudi dan nhan thay viec dau tu thim canh trong sin xuat bdng nhim F F y F nang cao nang suit, tang thu nhap, tao viec lim li het sire can thiet. 1.3. Thdi gian va dia diem nghien cihi - Thdi gian nghien cuu: tir thing 1 den thing 12 nim 2009. 7 ^^ - Dia diem nghien ciiu: Tai bin Nam Ciy xa Hoang Then, bin Phai Cit xa Khdng Lao vi ban Hgp I xa Bin Lang, huyen Phong Thd - tinh Lai Chiu. PHAN 2 TONG QUAN TAI LIEU 2.1. Mot so ket qua nghien ciru ve thdi vu gieo bong trong va ngoai nirdc Thdi vu gieo trdng cd tinh chat quyet dinh tdi nang suit ciy bdng. Viec xac djnh thdi vu an toin, thdi vu gieo bdng thich hgp ciing li mot vin de phiic tap, chiu su chi phdi cua hing loat cic yeu td nhu dieu kien khi hau thdi tiet, die tinh gidng, tap quin canh tic, quy luat phit sinh phit trien cic loii sau benh hai trong nam. Tuy nhien, vdi nhiing viing trdng bdng hoan toan dua vio nude trdi F F F F thi yeu td chinh quyet dinh thdi vu li lugng mua vi sir phin bd mua trong nim. O cic viing trdng bdng d vT do cao, miia ddng cd tuyet, phii dgi nhiet do dat cao tren 13-14 C mdi bat dau gieo. Ndng dan viing luu vuc song Duong Tir - F F F F Trung Qudc gieo bdng vio giura tiet cdc vii den lap ha tir 21/4 - 6/5. Nhung d cac nude chau Phi, mudn dat nang suit cao phii gieo bdng sdm vio liic cd cic tran mua dau tien (Le Song Du, 1996). Ket qua nghien ciiu cua Choi B.H (1973)[13] tai viing Phan Rang, thdi vu gieo bdng tdi thich thudng li giua thing 8 diu thing 9, tiic khoing 2-3 tuin trudc khi miia mua bit dau. Neu gieo vio thing 6, thing 7, thdi ky thu hoach se rai vao mua mua, neu gieo vio thing 10 ciy bdng con cd the hi thiet hai bdi mua Idn vi iing ngap, ciy sinh trudng cdi cgc, rung dai, nu, hoa va qui. Tic gii Dinh Quang Tuyen va ctv (2006) nghien ciiu tai Ninh Thuan, Tay Nguyen vi Ddng Nam Bd cho thay: trong dieu kien trdng bdng nhd nude trdi, gieo bdng sdm vao dau thing 7 hoac gieo mudn vao dau thing 8 deu cho nang suat bdng thip han so vdi chinh vu vio giiia thing 7. Cic nghien cuu gin day nhit cua Phdng khoa hgc& Cdng nghe Cdng ty bong mien Bic cho thiy thdi vu trdng bdng tai cic tinh phia Bac dao ddng trong khoang tir 5/5 din 5/6 duang lich, rieng vung mil Tiy Bac gieo bdng tu 5/5 din 25/5 cho nang suit cao. 2.2. Mot so nghien cihi ve mat do gieo trong bong Mat do li ylu to quan trgng inh hudng rat Idn den cic ylu td cau thinh nang suit va cic chi tieu sinh ly khic lien quan den ning suit. Tuy theo dilu kien dat dai, khi hau va dieu kien canh tic ciia viing, vdi moi giong muon phit huy het tiem nang nang suit thi cin phii xic dinh dugc mat do tdi thich. Theo Ly Vin Binh va Phan Dai Luc (1991), d Trung Qudc muon ning cao ning suit bdng trudc het phii quan tam den dien tich li, phii dieu chinh hoat ddng quang hgp d cay bdng lien quan den dieu kien ngoai cinh De cd chi sd dien tich li toi uu, ngudi ta cd the dung cic bien phip ky thuat nhu dilu chinh mat do gieo trdng, phan bdn, che do nude tudi [2]. F y t F Tren the gidi, mat do gieo trdng cho bdng thay ddi rat Idn, phu thudc y F y f%i nhieu vao gidng, dieu kien sinh thii va canh tic cua mdi vimg. Nghien cuu tic ddng qua lai giira gidng vi mat do d Bet Dagan thudc ddng bing ven bien cua Israel cho thay, cic gidng bdng cd dang hinh ggn, chin sdm nhu Tamcot SP37 cho nang suit cao nhat d mat do 2,4 van cay/ha trong khi nhiing gidng chin mugn nhu Acala SJ-2 cho nang suit cao d mat do 8,0 van ciy/ha. Cic thi nghiem tien hinh tren nen dit den d Bijapur-Kamataka, trong dieu kien nhd nude trdi ngudi ta nhin thiy, ning suit bdng hat khdng bi inh hudng bdi khoing cich hang. Trdng bdng d mat do 1,8 van ciy/ha cho ning suit bdng hat cao han so vdi mat do 1,2 van ciy/ha, nhung sai khic khdng cd y nghia d mat do 2,5 van ciy/ha. Gidng bdng DBS 119 trdng trong dieu kien cd tudi vi trdng nhd nude trdi, nang suit bdng dat cao nhat vdi khoing cich hing 96,5 cm, diy cung li F y khoing each hang thuin Igi cho cdng tic thu hoach. Ket qui nghien ciiu ve mat F y F do tai Texas ciia Landivar cho thiy, khi ting mat do gieo trdng tu 3,7 den 5,5 cay/foot (tuang duang 12 din 18 ciy/lm^) vdi khoing cich hing li 38 inch (tuang duang 0,965 m) thi nang suit bdng cd xu hudng giam. Ong dua ra khuyen cao ve mat do gieo trdng cho vimg niy la 30.000 den 60.000 ciy/miu Anh (hrang duang 74.000 din 128.000 ciy/ha) [18]. Theo Vii Cdng Hau, tai Viet Nam, doi vdi cic giong bdng luoi chi nen gieo d mat do 4 van cay/ha. d nhiing vimg cd nhiet do cao vi do im khdng khi cao thi khdng nen trdng qui diy. Gidng cd cinh qui dii mat do khdng dugc vugt qui 3 den 4 van ciy/ha. Ddi vdi cic gidng cinh ngin cd thi trdng tdi 5 - 7 van cay/ha. Theo Nguyen Khac Trung, rugng bdng trdng vdi mat do qui cao, cic cay mgc gin nhau qui, cinh li dan xen nhau se din den thilu inh sing, rugng bdng khdng thdng thoing, do dd nan rung dii, nu xiy ra nghiem trgng [7]. > F Trdng gidng bdng lai LI 8, vdi khoing cich hing cing hep (hay mat do ^ t*t F trdng cing day) dan den ty le qui thudc cinh due cing giim, ty le qui thudc cinh qua cang tang vi ngugc lai. Mat do trdng 2,5 ciy/m (vdi khoing cich Im X 40 cm x 1 cay) cho nang suit cao, dat 24,32 ta/ha (VG Xuan Long, 2000). F y ^ Le Quang Quyen vi Trin Thanh Diing khi nghien ciiu tai Quing Nam F y F ciing cho thay: khi tang mat do gieo trdng thi thdi gian sinh trudng tir gieo den tin thu ngin lai, sd qui/m vi nang suit ly thuyet cd xu hudng ting[6]. Tai vimg F Duyen hii Nam Trung Bd nude ta, mat do cua gidng bdng lai VNO 1-2 trong dieu kien khdng xir ly PIX cho ning suit cao nhit li 7,5 van ciy/ha. Theo Duong Xuan Dieu (2003) trong pham vi mat do nghien cuu tir 3,7 van ciy/ha den 12,5 van ciy/ha, khi ting mat do gieo trdng, cic chi tieu chieu cao cay, chi so dien tich li tang theo sir tang cua mat do gieo trdng d mgi giai doan. Sd qui/m^ vi nang suit bdng dat tdi da d mat do 7,5 van ciy/ha, sau do > F F Ft giim dan. Mat do cho ning suit cao nhit niy iing vdi chi sd dien tich li tdi da li F F > > 4,12. Khdi lugng qui va sd qui/ciy giim din theo chieu ting mat dd[5]. Ciing theo Duong Xuin Dieu (2003) cho hilt kit qui thuc nghiem ngoii sin xuit di khing dinh diing din ciia cic kit qui nghien ciiu thu dugc. Mat do gieo trdng F F cing tang thi nang suit ciing ting theo (trong pham vi 3,6 den 7,65 van cay/ha)[5]. Tai Dien Bien, bien phip gieo trdng vdi mat do hgp ly dugc ap dung d hau het cic vimg trdng bdng, mat do gieo trdng phd bien tai Dien Bien dao ddng [...]... lai F F y Ket qui theo ddi cho thiy chieu cao ciy ty le thuan vdi thdi gian sinh trudng, d thdi vu gieo sdm 20/4 chilu cao ciy cao nhit dat 154cm Cic thdi vu gieo 30/4, 10/5 va 20/5 cd chieu cao ciy sai khic nhau khdng ding kl cao hi 147,3 - 150,3 cm Thdi vu gieo bdng mugn 10/6 cd chilu cao ciy thap nhit 147,1cm t F t F Bing 3: Anh hudng ciia thdi vu gieo den sinh trudng phit trien cua gidng bdng lai. .. cho nang suit 15,6 ta/ha vi cho y F y ' lai thuan cao nhit li 3,642 trieu ddng/ha v i cao hon so vdi ddi chiing 518.000 ddng/ha d 2 muc phan bdn P4 v i P5 cho nang suit cao hon nhung cho lai thuin d mirc trung binh 3,2230 - 3,247 trieu dong/ha Xet ve ty suit Igi nhuan thi miic P2 cho muc sinh Idi cao 140,6% Gang diu tu phin bdn nhilu thi ning suat bdng ting nhung lai thuin khdng ting mi cd xu hudng giim,... nang suit cao 17,1 - 18,1 ta/ha Bdn phin d miic P2 v i P3 cho ning suit dat hi 15,6 - 16,2 ta/ha Nang suat dat cao nhat 18,1 ta/ha d miic diu tu phan bdn P5 cao hon hin so vdi ddi chiing 4,4 ta/ha Trong giong VNOl-2 trong dilu kien dat dai, khi hau tai Phong Tho - Lai Chau vdi miic diu hi phin bdn 190kg Ure + 300kg NPK + 75kg KCL/ha, kit hgp ap dung cic bien phip ky thuit tdng hgp cho ning suit cao nhat... ky thuit ddi vdi giong bdng lai VN20 trong ci hai trudng hgp ting mat do, cd phun chit dieu hoi sinh trudng X F F F hoac khdng tang mat do deu lim ting ning suit so vdi ddi chiing tu 24,28% den 37,12% v i mang lai hieu qui kinh te cao, Iii thuin cao han ddi chiing tu 1,1 trieu den 1,9 trieu ddng/ha (Dinh Quang Tuyen, 2004) Tai cic viing cd tiem ning thim canh bdng ning suit cao nhu Dien Bien, Dien Bien... dung ting ning suit mi sd cinh qui vd hieu lai tang do nu hoa rung nhieu Vien Khao ciiu Ndng Lim da tdng ket, nhirng noi bim nggn sdm, chi de fv F F F lai tren cay 5 - 6 canh qui din den ning suit khdng cao Nhirng nai bim nggn qui mudn, de nhieu cinh qui nen ciy khdng du sue nudi, ddng thdi qui phia tren thudng bi rung cdn nhiing qui phia dudi nhd v i khd nd Tdm lai, bim nggn sdm qua hay mugn qui deu cd... phin bdn cing cao ty le thinh qua cing tang Bdn phin vdi miic 240 kg N + 80 kg P2O5 + 80 kg KjO/ha cho sinh trudng chilu cao ciy, so lugng hoa qui tren ciy, khdi lugng qui v i F F nang suit bdng cao nhat Lieu lugng phin bdn cing ting thi thdi gian sinh trudng hi gieo den tin thu cd xu hudng dii han Dong thdi sd qui/ciy, so qui/m^ ning suat ly thuylt tang Tuy nhien, hieu qui kinh tl dat cao nhat d lilu... trung binh A cao dat tu 25,3 - 26,9 > 7 C, ddng thdi vio giai doan niy lugng mua giim hin 48mm vio thing 10 (6 ngiy mua) nen bdng nd qui thoit, ty le bdng loai 1 cao, chat lugng bdng xa tdt Bing 2: Mot sd yeu to khi tugng chinh tu thing 4 din thing 11 nam 2009 Tram khi tugng Mudng Lay (tuong duong vdi Phong Thd - Lai Chiu) Nhiet do khdng khi(V) Do imI Mua Thing Sd ngiy Thip Lugng mua mua Thip Cao TB nhit... it bien ddng dat tir 157,6 - 158,4 ngiy; Chilu cao ciy bdng cd xu hudng giim din d mat do gieo 4,2 van (chilu cao ciy 150,3 cm) din 6 van ciy (chieu cao ciy 145 cm); Sd cinh qui/cay cd xu hudng giim hi 14,6 cinh (d cdng thiic gieo 4,2 van ciy/ha) den 14 canh qui/cay (d cdng thiic gieo 6 van cay/ha); Ve chi tieu chieu dii cinh qui ciing cd xu hudng ngin lai khi trdng bdng ting mat do, d mat do 4,2 van... Doi tu-oTig nghien cihi * Gidng bdng VNOl-2: - VNOl-2 li gidng bdng lai cua Vien nghien ciiu ciy bdng v i ciy cd sgi, cd ngudn gdc tir td hgp lai CS95/VN36p - Thdi gian sinh trudng: gieo den 50% ciy nd qui tir 115-120 ngiy - Die tinh hinh thii: Cd tu 1-2 cinh due, mat do Idng tren li nhieu - Cd khi ning khing siu xanh v i riy xanh cao - Gidng cd khi ning thich nghi rgng - Ning suit bdng hat: tu 20... VNOl-2 qua 6 thdi vu gieo biln dgng hi 65 - 72,3 qui/m I Thdi vu gieo 20/5 cd qui/m^ cao nhat 72,3 qui/m^ tilp din thdi vu gieo 10/5 cho 70 qui/m ^ Bdng gieo mudn 10/6 cho so qui it nhit 65 qui/m ^ Thdi vu gieo sdm 20/4 cd so qui hi thdi/m^ d nhilu nhat 11 qui/m^ (chilm ty le 16,2%) cao hon so vdi 5 thdi vu gieo cdn lai (sd qui thdi hr 3,3 - 5,3 qua/m^, chilm 5 - 8,1%) F F Khdi lugng qui cua gidng bdng . PHAN BONG MI^N BAG BAO CAO TOMG K^r De tai: "NGHIEN ctru THdl VU VA CAC BI$N PHAP KY THUAT TRONG BONG NANG SUAT CAO PHU HOP V6l CAC VUNG DOI NUI 6 LAI CHAU" Thuc hien. cao ty le thinh qua cing tang. Bdn phin vdi miic 240 kg N + 80 kg P2O5 + 80 kg KjO/ha cho sinh trudng chilu cao ciy, so lugng hoa qui tren ciy, khdi lugng qui vi F F nang suit bdng cao. lai hieu qui kinh te cao, Iii thuin cao han ddi chiing tu 1,1 trieu den 1,9 trieu ddng/ha (Dinh Quang Tuyen, 2004). Tai cic viing cd tiem ning thim canh bdng ning suit cao nhu Dien Bien,