Tgp chi Khoa hgc Tnr&ng Dai hgc Cdn Tha Phdn B: Xong nghiip. Tltuy san vd Cdng nghe Sinh hoc: 2612013): l-ll
Tap chl Khoa hpc Tru'dng Oai hpc Can Thd website: sj.ctu.edu.vn
HIEU QUA CUA BIOSAR PHONG TRlT BENH 0 A O ON (PYRICULARIA GRISEA) TRONG MO H i N H CANH TAC LUA THEO TIEU C H U A N \ T E T G A P
T ^ I HUYEN TAM NONG, TINH DONG THAP Vu Anh Phap'
' Vien NCPT Dong bang song Cuu Long, Tnrdng Dai hoc C^ Tlia Thong tin chung:
Ngdy nhgn: 06/09/2012 Ngdy chdp nhgn: 20/06/2013 Title:
The effects ofBiosar on rice blast disease (Pyricularia grisea) under the rice field conditions in Tam Nong district, Dong Thap province
Tu khoa:
Biosar. binh chdy Id, JasmineSS, mdt do sg
Keywords:
Biosar. Blast disease. JasmineSS.
seed rales
ABSTRACT
Testing the effects ofBiosar-3 DHCT (CuClz} on blast disease was carried out in randomized complete block design in Dong Thap province. The results showed that both fimgicide and Biosar treatments reduced leaf and panicle blast diseases significantly different than those of checked treatment. Treatment ofBiosar did not highly affect on plant height, number of panicles.m'' and panicle blast disease. However, it increased number of filled grains, grain weight and grain yield. Ihe yield of Biosar treatment was 7.14 tons hd' compare to the yield of checked treatment was 5.08 tons.ha'
. Seed rate of 100 kg.ha' treatment reduced rice blast damage and increased the effects ofBiosar.
TOM TAT
Ddnh gid hieu luc qudn ly benh dgo on bdng biin phdp tdng hap kit hgp sir dung chdt kich khdng Biosar-3 DHCT (CUCI2J. Thi nghiem dirge bd tri theo Ihi thuc khdi hodn loan ngdu nhiin tgi tinh Dong Thap: Kit qud thi nghiem cho thdy cd hai nghiim thuc co xu ly thudc trir benh dao dn vd Biosar cd hieu gud gidm benh dgo on khde biit so vdi doi ehung. Xu ly Biosar khong dnh hudng den chiiu cao cgy, sd bongm' nhung gia tdng sd hgt chdc/bdng, ty le hat chdc, trong lugng WOO hgt. tir do gjiip gia tdng ndng sudt. Tuy nhien, Biosar khong cd hieu gud cao ddi vdi benh dgo dn cd bdng. Ndng sudt dgt 7,14 tdn^ so vdi ddi chung 5.08 tdn/ha. Sg vdi mat do JOO kglia giiip cdy lua hgn che dugc su gdy hgi cua benh dgo dn Id ddng ihdi tdng hiiu qud cua biin phdp kich khdng.
1 GIOI THIEU
Mot trong nhihig dich faai quan trpng nhat tai dong bang song Ciiu Long (DBSCL) ctia cay Ilia la benh dao on. Benh gay hai tren cd Id, be than. bong. hat. Bien phap phong trir benh chay la tir tnroc den nay cfaii yeu la sir dung giong khang va sir dung tfauoc bao ve tfauc vat (BVTV). Tuy nfaien. do sir tfaay doi nfaanh
chong ciia cac noi gay benh nen viec su dung giong khang gap nhieu kho khdn (Pham Vdn Kim, 2000), viec tim dugc giong khang benh phai ton thoi gian ddi, mat nhieu cong siic. Vi the. sii dung thuoc BVTV van la bien phap chinh, dugc nong dan sir dung nhl§u nhat d^
doi pho vai benh dao on nhung chi phi cao va gay 6 nfailm moi truang. Bien pfadp kicfa tfaich
Tgp chi Khoa hgc Tnrang Dgi hoc Can Tha Phdn B: Kong nghiip. Thuy san \d Cdng nghe Sinh hgc: 26 aO}3): 1-11 tinh khang benh dao on tren giong nhiem benh
CO the xem la giai phap giai quyet mgt phdn kho kfadn tren. Tir nam 1998 den nay, cac nha kfaoa fagc DBSCL da ti6n hanh nhieu nghien cuu ling dung nguyen ly kich khang de quan ly benfa dao on va dat dugc nhieu ket qua tfaanh cong. Cac tac gia da tim ra tren 10 tac nfaan gay kich khang giup giong liia nhiem benh tra nen khdng vira vai benfa dao on. Trong do, clorua dong (Biosar) da dugc dp dung tren dong tren rugng va co hieu qua cao trong viec phong trii benh dao on a cac tinfa DBSCL.
Tiep tuc khang djnh hieu qua cua chat kich khang quan ly benfa dao on, dac biet trong mo hinh VietGAP, thi nghiem "Hieu qud cua Biosar phong trie benh dgo on (Pyricularia grisea) trong mo hinh canh tdc lua theo tieu chudn VietGAP tgi huyen Tam Nong, tinh Dong Thap ", dugc thirc faien nfadm:
- Phan tich hien trang canh tac lua ciia nong ddn xa Phii Cuang, fauyen Tam Nong, tinh Dong Thap de de xuat gidi phap canh tac hgp ly.
- Phan ti'ch, danh gia hieu qua giiia sir dung chat kich khang Biosar trong quan ly benh dao on so sanfa v o i s u dung thuoc hoa hgc tfaeo tap quan dinfa ky ciia nong dan.
2 PHU'aNG PHAP NGHIEN CUtJ 2.1 Danh gia thuc trang canh tac liia tai xa
Phii Ciromg, huyen Tam Nong Tien hanh dieu tra ngau nhien 30 hg trong lua bang each pfaong vdn tryc ti^p cac ho trong Ilia vai pfaieu cau hoi da chuan bi san trong 2 vu Dong Xuan 2009-2010 va He Tfau 2010 tai xa Phu Cuang, huyen Tam Nong, tinh D6ng Thap. Ket qua thu thap dugc xu ly phan tich thong ke va danh gia.
Ngi dung dieu tra bao gom nhirng thong tin CO ban ve san xuat lua cua nong hg, dien tich, ky thudt canh tac, mat do gieo sa, sir dung phan bon, tfau6c BVTV, cac failu bi^t \h benh dao on, bien phap phong trir benh dao on...
dugc nong dan ap dung pho bien trong canh tac lua.
- So lieu sa cap dugc thu thap thong qua dieu tra true tiep nong hg lira chgn ngdu nhien
30 hg de phong van dua tren philu cdu hoi dd dugc chuan hi sdn.
So lieu thii cap ve dieu kien ty nhien va tinh hinh san xuat Iiia 6 khu vuc dilu tra dugc thu thap tir cdc ca quan: phong thong ke, phong nong nghiep & PTNT, Tram Kfauyen Nong huyen Tam Nong...
2.2 Danh gia hieu Ivc quan ly benh dao on bang mat do sa va ki'ch khang Biosar 2.2.1 Vgt lieu thi nghiem
Thai gian thyc hien: vu Dong Xuan 2 0 1 0 - 2 0 1 1 .
Dia diem tfayc faien; HTX Tdn Cucmg, xa Phu Cuang, huyen Tam Nong, Dong Thap.
Giong Iua Jasmine85, chat kich khang Biosar, thuoc BVTV, phdn bon va cdc dung cu, thiet bi can thiet de do, phan tich cac cfai tieu nong hgc, ndng sudt.
2.2.2 Phuang phdp thi nghiem
Bo tri thi ngfaiem theo the thiic 16 phu, 2 nhan to, vai ba lan lap Iai, mdi 16 c6 dien tfch la 100 m^, dap ba phan 16 de nuac kh6ng qua lai giiia cac 16 thi nghiem.
Thi ngfaiem g6m hai nfadn t6:
Nhan to kich khdng la nhan io chinh, dugc bo tri trong 16 pfau gom co 3 ngfaiem thiic.
Nghiein thuc 1 (su dung thu6c theo tap quan n6ng dan):
- Xir ly hat gi6ng truac khi gieo. Pha Cruiser Plus 20-50 mI/4 lit nuac/100 kg lua giong, roi cho vao thimg tuai hoa sen, phun hoac tucri deu len giong (da qua ngam ii), sau do trgn deu va tien hanfa dem gieo sa.
- Giai doan 20 NSKS: sir dung thuoc Fuji- one 40WP de phong ngira benfa dao on vai lilu lugng 1-1,2 kg tfauoc /faa. Pfaun uat diu len la.
- Giai doan 30 NSKS: sir dung thu6c Fuan 40 EC vai lilu lugng 1-1,2 lit/faa. Phun ucft deu tren Id.
- Giai doan 40 NSKS: su dung thu6c Beam 75WP vai lilu lugng 0,2-0,25 kg/ha.
Phun udt deu len tan Id, than.
Tap chi Khoa boc Tnr&ng Dgi hoc Cdn Tha Phdn B- J\ dng nghiip. Tlmy san \d Cong ngbe Sinh hgc 26(2013): l-ll
Giai doan 60 NSKS: sii dung Filia 525SC kit hgp TiUSuper 300EC. Phun vao thai diem truac tro 7 ngay va sau tro 7 ngay de han che benfa dao on c6 bong vd lem lep hat.
Lilu lugng sii dung: Filia 525SC (0.5 lit/ha) + TihSuper 300EC (0,25-0,3 lit/ha).
Nghiem thuc 2 (su dung Biosar):
- Xii ly hat bdng chat kich khang: pfaa 30 cc/binh 16 lit cfadt kich khang Biosar tiieo ty le 1 phan nuac: I pfadn giong, ngam 24 gia, xa cfaua, ii binh thuang 12 gia, sau do dem gieo sa binh tfauong.
Giai doan 20, 40 NSKS: Pfaun Biosar-3 DHCT (30 ml/binfa 16 lit), lugng nudc phun 320 lit/ha, phun udt diu len Id.
- Giai doan 60 NSKS: Phun Biosar-3 DHCT (30 ml/binfa 16 lit), lugng nudc phun 320 lit/ha, pfaun udt deu len la, ket hgp vdi phun thudc ngira dao on c6 bong Filia 525SC.
Nghiem thdc 3 (Khong xu ly): kfaong xu ly kich khang va khdng pfaun thuoc.
Mat dp sa la nhan to phu, dugc bd tri trong 16 chinh g6m hai miic:
Mat do 100 kg/ha Mat do 150 kg/faa Bien phdp canh tdc
- Lam dat: dat dugc trang bdng tfaat ky.
phan cfaia cac 16, ddp bd trudc khi sa Bdn phan: bdn pfadn tfaeo bang so mau la, lugng phan sir dung trong tfai ngfaiem 120 kg Ure + 130 kg DAP + 100 kg KCl/ ha.
tuong duomg: 78kgN + 60 kgP205 + 60 kg K 2 0 /ha.
Chia lam cac lan bdn Bdn Idt: 2/5 P;05
Ldn l:7-10NSKS:I/5N+2/5P205 Ldn 2: 20-22 NSKS: 2/5N +1/5 P.Os Ldn 3: 4 0 ^ 5 NSKS: 1/5 N + 1/2K;0 Lan 4: Bdn nudi hat (khi liia trd diu):
I / 5 N + I/2K2O
Quan ly sau hai theo phuang phap IPM.
2.2.3 Cdc chi tieu ghi nhdn, theo doi Khung dieu tra/diem: 50 cm x 40 cm (0,2 m"), chgn 5 diem theo dudng hinh Z.
Chi tiiu benh dgo on
Dieu tra dinh ky 10 ngay/lan (khi co benh xudt hien).
Dieu tra theo phuang phap dieu tra phat hien sinfa vat hai liia 10 TCN 982: 2006 (Bg N6ng nghiep va Pfaat trien n6ng thon, 2006).
- Ddnh gia benh dao 6n (IRRI. SES.
2002).
Chi tieu ve dac tinh nong hoc, cdc thanh phan nang sudt cua cay Ma
Chieu cao cay (cm), Sd chdi: theo ddi gfai nfadn 10 ngay/lan, bdt dau tir giai doan 20 NSKS din kfai lua trd diu.
- Tfaanh phan nang suat: sd b6ng/m". So hat chdc/bdng. Trgng Iugng 1000 hat.
- Nang sudt thyc te (tdn/ha): gat 5 m" d mdi 16, quy d6i ra ndng suat tfayc te d am do 14% (tdn/ha).
Xu ly so lieu
Cac sd lieu sau kfai tfau thdp dugc sii dung phan mem EXCEL de quan ly sd lieu va phan tich sd lieu bdng phdn mem SPSS de danh gia cac chi tieu ve hien trang san xuat liia cua ndng hp cung nhu kit qud thi ngfaiem canh tac tren ddng rugng.
3 KET QUA VA THAO LUAN 3.1 Danh gia thyc trang canh tac lua 3.1.1 Dien tich canh tdc cua nong ho
Qua dieu tra cfao thdy dien tich canh tac liia cua ndng hd binh qudn la 2,57 ha. Nfain cfaung dien ticfa canh tac cua ndng hp Idn va tap trung trong khoang 2 - 4 ha chiem 53,3%, s6 hd dudi 2 ha chiem 36,7%, so hg tren 4 ha chilm 10%.
Hp cd dien tich thdp nhdt la Id 0.8 ha, dien tich cao nhat la 12 ha. Tir ket qud dieu tra cho thay dien tich canh tac ciia cac fad phan bo tuong ddi ddng deu. quy md san xuat rpng, tap trung.
Vdi su pfadn bd tap trung tren se tao dieu kien tfauan lgi san xuat liia hang hda, ap dung ca gidi hda va ap dung khoa hpc ky tfauat. tang
Tap chi Khoa hoc Truang Dgi boc Cdn Tha PhdnB -\gngnghiep. TTmy san va Cong nghe Sinh hgc. 26(2013): l-ll
cudng dau tu cac ndng cu phuc vu san xudt cua n6ng hp gdp phdn tang ndng suat.
3.1.2 Ca cdu giong lua
Kit qua dilu tra ghi nhdn d ca hai vu Ddng Xudn 2009-2010 va vu He Thu 2010, ndng hg hdu hit sir dung giong liia Jasmine85, gidng Ilia thom, chdt lugng cao la gidng chii lyc chilm 93,3%, trong dd vu Dong Xuan 96,7%
vd He Thu 90%. Cac gidng cdn lai nfau OM2395, IR12340-108 cfaiim ty le rdt nhd (6,7%).
3.1.3 Nguon goc, cdp giong lua
Nguon goc: 88,3% nong hg mua hoac trao ddi gidng d l san xudt, gidng cd ngudn gdc ro rang, s6 ho ty d l giing 11,7%. Ngudn gi6ng ma nong hg sii dung gieo sa chu yeu trao ddi giing vdi nfaau (chilm 21,7%), Hgp tac xa Tan Cudng (13,3%), mgt s6 hp cd dieu kien di lai thi mua tir trai gidng (18,3%), mua tir vien liia (13,3%), cac dai Iy nhu dai Iy Ngpc Khue, BVTV An Giang, noi khac.
Bang 1: Ngudn goc giong sir dung ciia nong ho vu D 6 n g X u a n 2009-2010 va H e T h u 2010
NguoQ goc vien lua D^i ly Ngpc KhuS BVTVAnGiaiig Trai giong Binh Diic HTX Tjin Cucmg Trao doi voi dan Tir de giong Noi Idiac Tong
chung 8
3
5 11 8 13 7
J
60
Tile
(%)
13,3 8,3 8,3 18,3 13,3 21,7 11,7 5.0 100.0 Nguon- Kel qua dieu ira lgi xd Phu Cudng. huyen Tam AoMg, Dong Thdp, nam 2010Cdp giong: ty le ndng hp su dung cap gi6ng sieu nguyen chiing rat it chiem 3,3%, gi6ng nguyen chiing cfaiem 30% tap trung san xuat d vu Ddng Xuan de san xudt lua gidng. Da sd cac hg trong vting dieu tra deu sii dung cap gidng \ac nfadn 1 chiem 41,7%, giong xac nhan 2 chiem 21.7%. Sd hd sii dung liia luang thuc de ldm giong rat thap chi 3.3%. Nhu vay, nong dan da y tfaiic dugc tiim quan trgng cua
chdt lugng giong, sir dung n^uln giong t6t dam bao cay liia khde, tdng chdt lugng va han chl sau benh.
3.1.4 Xuly hgt giong, phuangphdp gieo sg va mat do sg
Xu ly hgt giong: trudc khi gieo nhdm muc dich han che mdm sdu benh trong hat, giup cay Ilia khde, phat trien tdt trong giai doan ddu.
Qua dilu tra ghi nhdn 100% ndng hg diu cd xOr ly hat gidng trudc khi sa trong cd hai vu Ddng Xudn va He Thu. loai thuoc ma hau het ndng hd sir dung la thudc Folicur 430SC (93,3%) nhdm trir benh liia Von vi giong Jasmine85 nhiem benh liia Von vd chi so it hp dting Crusier3'l2.5FS(6,7%).
Phuffngphdp vd mat do gieo sg Hdu hit ndng hd diu dp dung phuang phap sa lan 76,7% va sa hang chi chiem 23,3%, khdng cd hg sir dung phuong phap cay.
Lugng gidng ma ndng fap sir dung de gieo sa biln do tir 100-120 kg/ha (chilm 78,3%), trung binh lugng giong gieo sa la 118 kg/faa.
Nhu vay, lugng gi6ng gieo sa cua n6ng hp tuang ddi chua phii hgp vdi khuyen cao ciia nganh ndng nghiep nhdm faan che sdu benfa hai phat trien.
Sic dung phan bon
Cac hg trong vung canh tac chi bdn phdn hoa hgc khdng su dung phan hiru ca, thdng tfaudng bdn cho lua 3 lan vao cac giai doan 7- 10, 20-25 va 40-45 NSKS. Cung cd mdt vdi hd chia bdn phan 5-6 lan trong sudt vu.
Lugng phan bdn hoa hgc ma cdc fad sir dung kha cao nhu 105 N-71 P.Os-SS K26 ddi vdi vu Ddng Xuan va 105 N-83 P2O5- 62 K.G ddi vdi vu He Thu. Do kfadng sii dung phan hiiu ca nen dii chi san xuat 2 vu/ndm nhung phai bdn kfaa nhieu phdn hoa hgc lam tang chi phi san xuat, lgi nhudn khdng cao, ben canh dd tao dilu kien cho sdu benh phdt trien, gay hai.
Sit dung thuoc BVTV Thuoc trie sau
Cdc loai thudc hda hgc ma ndng dan thudng su dung de trir cac ddi tugng dich hai
Tgp chi Khoa hgc Tnr&ng Dai hoc Cdn Tha PhdnB- Nong nghi4p. Thuy san vd Congnghe Sinh hgc. 2612013): l-ll chinfa nfau rdy ndu, sdu cudn la, nhen gie, sau
due than... Kit qua dilu tra ghi nhan hau het ndng ddn sir dung thu6c hda hgc cfau ylu de phun ngira va tri vao timg giai doan phat trien cua cay liia, rdt it hp dp dung bien phdp phdng trir dich hai tdng hgp, trung binh cac hd phun thudc tir 3,3 ldn (vu Ddng Xuan 09-10) d i n 4,17 ldn (vu He Thu 2010). Vu He Thu do dich hai xuat hien va gay hai nhieu nen s6 ldn phun xit thudc cao han (cao nhdt la 9 ldn) so vdi vu Ddng Xudn (cao nfadt la 7 lan).
Thuoc trie benh
Cfaii yeu la benh dao on va dom vdn, trung binh ndng ddn phun thuoc phdng ngira va trii benh tir 3,83 ldn (vu Ddng Xuan 09-10) va 4,77 lan (vu He Thu 2010), ca biet cd hd sii dung thudc benh 7-9 lan/vu. Ket qud phong tru sdu benh hai ciia ndng hp gfai nhdn sd ldn pfaun thuoc trir sdu va trir benh cua cac hd trong viing dieu tra tucmg ddi nfaiiu, mac dii phdn ldn cac hd cung da dugc du cac ldp tap hudn ve bien phap phong trii t i n g hgp IPM. Tuy nhien, hau het ndng ddn khi tfady sdu benfa xudt hien thi rat Io ldng va phun thudc diet trii sau benh ngay. Hon niia, trong mgt lan phun ndng dan sii dung nhieu loai thudc hda hpc kit hgp vdi nhau va pha them phan bdn la nen hieu lyc phdng trir khdng cao, de lam tang tinh khang thuoc ddi vdi cac doi tugng sau hai nhat la ray nau, sdu cudn la va benh dao dn.
B8nh dao dn hai liia tuy ndng dan dd cd nfaan bilt dugc tac hai do benh gay ra phdn Idn cac hd chii yeu la phun ngira bdng nhieu loai thudc hda hgc, lam tang sd lan phun thudc trii benh, tang chi phi dau tu cho san xudt lua, lam d nhilm mdi trudng, dnh hudng den siic khde con ngudi dac biet tren vimg nay dang chudn bi thuc hien xdy dyng quy trinh san xuat liia theo hudng an toan ve sinh thyc pham, theo tieu chuan VietGap. Chinfa vi tfae, viec chgn dia diem trien khai thi ngfaiem tai dia ban tren la rat phu hgp va can thiet.
3.2 Danh gia hieu luc quan Iy benh dao on bdng mat do sa va kich khang Biosar 3.2.1 Anh hudng cua mat do sg va xic ly kich
khdng len ty le benh dgo on lua Ket qua bang 2, cho thdy tai cac thdi diim ty le benh trung binh ciia cac nghiem thiic phun thuoc cd sy khac biet y nghia thdng ke so vdi nghiem thiic khdng xii ly thudc vao cac thdi diem xuat hien benfa dao on la din giai doan sau tr6 (benfa dao 6n cd bdng). Hai ngfaiem thuc phun thudc hda fagc va ngfaiem thirc xir ly benfa bdng chat kich khang Biosar deu giup giam benh faan so vdi ddi cfaiing.
Giiia bien phap phun thu6c trii benh bang thudc hda hgc va bien phap xu ly bdng chat kich khang Biosar hau nhu khdng khac biet cd y nghTa mac dii d nghiem thiic phun tfauoc trir benh bang thudc hda hpc cd ty le benh thap hon. Ket qua phii fagp vdi ngfaien ciiu cua Trjnh Nggc Thuy (2000) va Nguyen Phii Dung (2005) khang dinh rdng cay lua cd khd nang ki'ch khang benh tir 9-24 ngay sau khi xir ly bang each ngdm hat vdi chat kicfa khang va cd hieu lyc kich khang keo dai khi phun chat kich khang len liia vdo giai doan 20 NSKS.
Trong dieu kien sa hai mat dp khac nhau, d mat do 150 kg/ha ty Ie benh dao 6n cao faon so vdi d mat dp 100 kg/faa ngay tir khi xuat hien benh dao dn 32 NSKS den cac giai doan sau.
Dilu nay cd the khang dinfa gieo sa cang day.
tan la cang nhieu, kha nang che khudt cang Idn, am do dudi tan la cdng cao, dieu kien vi kfai hdu cang tfauan Igi cfao nam dao dn va khd cd bdng pfaat trien.
Anfa faudng tuong tac giiia mat do sa va xir ly tfaudc din hieu qua pfadng tri benh dao dn cho thdy: d mat do 100 kg/ha xii ly kich khang Biosar cd ty le benh dao dn thdp han so vdi d mat do 150 kg/ha vao thdi diem benfa dao dn bdt ddu xuat hien va pfadt trien manfa (giai doan 32 va 67 NSKS), kfaac biet cd y nghta thdng ke. Cdc giai doan khac khdng khac biet y nghTa.
Tgp chl Khoa hgc Tnr&ng Dgi hgc Cdn Tha Plian B- Ndng nght?p. Thuy san ra Cdng ngh? Sinh hgc: 26 (20131 1-11 Bang 2: Aohhu^ngcua mat do s? va ki'ch khang ISn ty IS b|nh dao on vuDX 2010-2011
N^i dung
32 NSKS 42 NSKS
Ty le b^nh d^o 52 NSKS
on (%)
67 NSKS 77 NSKS 89 NSKS M§td$
100 kg/ha 150 kg/ha Y nghia CV(%)
24,15a 35,09b 7,38
56.83a 60.45b 4,88
57,93a 65,29b 6,74
41,59a 54,76b 17.72
18,22a 23,16b 9,31
3,35a 5,73b 9,70 Xu Iv thuoc
Thuoc hoa hoc Biosar Khong xu ly
23,68a 26,39a 38,77b
57,05a 58,80ab 60,08b
59,39a 60,69a 64,75b
43,11a 46,04a 55,38b
17,25a 18,66a 26,17b
3,21a 3,82a 6,60b Mat d$ * xir 1^ thuoc
^ ^„ Thuoc hoa hoc , „ Biosar kg/ha ^. . . ,.
Khong xu ly
•J, Thuoc hoa hoc , . Biosar kg/ha „, . . ,.
Khong xu ly Y nghia CV(%)
22,43ab 18,08a 31,20b 24,94a 33,98b 46,35c 26,55
55,20a 56,62ab 58,67b 58,90a 60,97a 61,49b 3,14
55,89a 57,42ab 60,48b 62,89a 63,97a 69,01b
*
4,16 37,84a 38,86a 48,07b 48,39a 53,21b 62,70c 6,23
15,87a 16,69a 22,10b 18,63a 20,64a 30,22b 13,24
2,57a 3,09a 4,39b 3,84a 4,55a 8,8Ib 16,33 Cdc so Irong ciing mot cgl ca ciing
ns: Khong khdc bi?l, *: Khdc biel
cha- gidng nhau thi khong khdc bi4t a m\
mirc y nghTa 5%: NSKS: ngg}-sau khi Si
7)' nghTa 5% tiong phep thu Duncan
3.2.2 Anh huang cita mdt do sg vd xic ly kich khdng len chi so benh dgo on liia Bang 3 cho thay chi so benh Dao dn d hai nghiem thiic cd xii ly thudc khdc biet y nghTa thdng ke so vdi nghiem thirc kfadng xii ly.
Tuong ty nhu ty le benh dao dn. cac nghiem tfaiic cd cfai so benfa cao nfaat the hien vao giai doan 52 NSKS. Nghiem thiic xii ly kich khdng Biosar va nghiem thiic phun thuoc trir benh bang thudc hda hgc chi so benfa dao dn kfaong kfadc biet, vet benfa chu ylu d cdp 1-3. Tuy nhien, d nghiem tfaiic xir ly kich khang Biosar cd chi sd benh thdp faon (15,99%) ngfaiem thiic phun thudc trir benh bdng thuoc hda fapc (16,12%). Ket qud nay cho thdy xu ly chdt kich khang phdng trir cd faieu qua tuong duong vdi viec phun thudc trir benh bdng thudc hda hgc, xtr ly kich khang bang Biosar cd tac dpng lam giam chi sd benh chay la (Le Hiru Hai, 2008).
Ket qua thi nghiem cung cho thdy, mat dp sa anh hudng din sy phat triln cua benh, gieo sa cang day, cang tao dilu kien cho ndm benh phat trien. Kh6ng co sy khdc biet y nghTa v l chi s6 benh giu^ cac nghiem thirc cd xir ly thudc hod hgc hay xu ly kich khang d cd 2 mat
dd sa; phun chat kich khang hay thudc hoa hgc len la liia d mat do thap cd chi sd benh thap han mat dp cao va khac biet y nghTa vdi ngfaiem tfaiic ddi chiing (kfaong xii ly). Ket qud nay pfaii fagp vdi bao cao cua Nguyen Minfa Kiet (2003) ket ludn rang trong dieu kien bdn pfadn dam hgp ly (80 kg/N) va sa thua (100 kg/faa) bien phap kich khdng xu ly hat va phun len la lua cd hieu qua kich khang dn dinh, viia giiip giam benh chay la, vira giup tang nang suat va hieu qua kinfa t l .
Nhu vay, khi cdy liia dugc xir ly chdt ki'ch khang Biosar thi bao tii ciia ndm gay benh van xam nhilm va nay mdm tren be mat la liia nfaung nhung vit benh nay se it phat triln thanfa vit benfa cap 5-7 tren la ma chii yeu d cdp 3, cd kha ndng lic chl sy hinh thanh bao tir. Trong dilu kien san xudt Iua theo hudng an tomi hien nay, sii dung kich khang nhdm han che d nhilm mdi trudng dang la yeu cdu cdn thilt. Sir dung chat kich khang Biosar cd kha nang kich thich tinh khang benh dao dn tdt, kfad an toan, cfai pfai thap faon nhilu so vdi viec phdi pfaun thuoc hda hgc trir benh thudng xuyen.
Tgp chl Khoa boc Tnr&ng Dgi hgc Cdn Tha Pbdn B .\dng nghiip. Thin- sail va Cong ngh? Smh hgc: 26 (2013)- l-ll
B a n g 3 : A n h h i r o n g c u a Noi d u n g
m a t d 9 sa v a ki'ch k h a n g len chi sd b e n h d ^ o d n v u D X 2010-2011 32 NSKS 42 N S K S
Chi so benh dao on (%)
52NSKS 67 NSKS 77 NSKS 89 NSKS M a t d Q
100 kg/ha 150 kg/ha Y nghia CV (%)
2,89a 5,16b 7.02
12,63a 15.00b 8.09
15,13a lS,65b 5,05
5,08a 7,29b 17,68
3,43a 4,51b 11,13
1.13a 1.91b 45,85 Xir IV thudc
Thuoc hoa hoc Kich khang Biosar Khong xij Iy
2,94a 3,38a 5,77b
13.46a n j i a 14,77b
16,12a 15,99a 18,57b
5,31a 6,02a 7,24b
2.85a 3,46b 5,60c
1,09a 1,26a 2.21b M§t d§ * xir ly thuoc
.„-, Thuoc hoa hoc , - Biosar kg/ha „ , . . , .
^ Khong x u ly , , „ Thuoc hoa hoc , - Biosar
^ Khong xii ly Y n g h i a C V ( % )
2.73a 2,17a 3,77b 3,13a 4,59a 7,77b 37.98
12,32a 12,14a 13.44b 14,60a 14,30a 16,11b 5J!6
14,92a 14,13a 16,34b 17,31a 17,84a 20,79b 4,45
4,60a 5,12ab 5,54b 6,03a 6,92a 8,95b 7,33
2,85a 3,20b 4 J 4 c 2.86a 3,72b 6,96c 8,42
0,96a 1.07a 1,36b 1,23a 1.44a 3,06b 26,20 Cac so Irong ciing moi col Co citng chir giong nhau Ihi khong khac biit o mirc y nghTa 5% U'ongphep ihir Duncan ns Khong khdc biet, *: Khdc biet a mucy nghTa 5%, XSKS ngdy sau khi sa. D.V f}6ngXudn
3 23 Anh htiomg ciia mat do sg va chdt kich nghiem thirc phun thuoc trir benh bang thuoc khang din chieu cao cd)' liia hoa hoc va nghiem thirc xir ly Biosar co chieu Chi6u cao cay cua cay liia o cac nghiem ^ao cay tuong duong nhau (Bang 4). Ket qua thitc hiu nhu khong co su- khac biet vao giai '^^° thdy sii dung kich khang Biosar khong anh doan 67 NSKS mac dii d mot s6 giai doan huong den su phat trien cua chieu cao cay liia truac nhu 20, 32. 42, 52 NSKS nghiem thirc cuoi ciing, phii hop voi nghien ciiu ciia Tran khong xu ly co chiju cao cay cao hon khac Van Phuc, 2004; Ngo Phuong Dai & DJng Thi biet so vai nghiSm thirc co xir ly. e 6 i voi Tho, 2004, Nguyen Hong Tin, 2005.
Bang 4: A n h h i r o n g ciia m a t d $ N^i dung
sa v a ki'ch k h a n g len s v p h a t 20 NSKS
trign chieu c a o SIT phat trien ciia chieu cao cav 32 NSKS 42 NSKS
cay VM D X 10-11 lua (cm)
52 ^'SKS 67 NSKS M a t d $
100 kg/ha 150 kg/ha Y nghia CV ^%) Thuoc hoa hpc Kich khang Biosar Khong xir ly
37.32 39.22 2,05 37,63a 36.87a 40.31b
50,60a 54.45b 5,29 51,52a 50,94a 55.13b
65,60a 66.26b 1,34 64,83a 65,16a 67,77b
72,57a 73,99b 1,93 72,52a 73.00a 74,33b
84.60a 85,39b 1,64 85,02 85.14 85.22 Mat d§ * XU" ly thuoc
.-,-, Thuoc hoa hoc , . Biosar
*^^^^ K h o n e x i l y Thuoc hoa hoc , - Biosar ' ' ^ Khonsxuly Y nghTa
CV {"/.)
36,75a 36,09a 39.10b 3S,51a 37,63a 41,51b 2.32
50.06a 50,27a 51,47b 52.97b 51,60a 58.80c 4.26
64,53a 65,50ab 66.75b 65,13a 64,83a 68,80b 1,69
72,66ab 71,43a 73,63b 73,34a 73,60a 75,04b 1.20
84,47 84,59 84.75 85,57 85,18 85,70 ns 0.85 Cdc sd irong ciing moi col co ciing chir giong nhau ihi kliong klidc biel a mucy nghta 5% li ong phep ihu Duncan ns- Khdng khdc biel. * Khdc biel a mirc y nghia 5%; SSKS: ngay sau khi sa. DX: Dong Xuan
Tap cbi Khoa bgc Tnr&ng Dgi hoc Cdn Tha Phdn B. Nong nghiip. Thuy san vd Cong nghi Sinb hgc: 26 (2013): I-l I
3.2.4 Anh hu&ng ciia mat do sg va chdt kich khdng den so choi
Ket qua cho thdy sd chdi/m' cd su khac biet y nghTa vS mat thdng ke d hai mat do khac nhau, sd chdi sau khi dat cao nhat vao giai doan 32 NSKS, cac giai doan sau sd choi cd xu hudng giam ddn do thdi gian nay cac chdi vd hieu bi ch^t. Sd chdi/m" d hai mat do gdn nhu tuang duang nhau sau giai doan 67 NSKS den khi thu hoach. Tir kk qua tren cho thdy, du mat do sa 100 kg/faa faay mat do sa 150 kg/faa thi kit qud sau ciing cung khdng cd sy khac biet \h chdi/m^. Ket qud nay chiing td sa thua d mat do 100 kg/faa giup cay lua nay cfadi nhigu han, manh han so vdi sa day 150 kg/ha.
Vi vay, mat do sa lOOkg/ha la fagp ly ddi vdi Bang 5: Anh hirang eua mat d? sa va Idch khang d£n
gidng Jasmine85.
3.2.5 Anh hu&ng cua mat do sg vd chdt kich khdng den thdnh phdn nang sudt vd ndng sudt
Thdnh phan nang suat
36 bong: Kk qua thi nghiem cfao tfady sd bdng/m" d hai mat do sa khdc nhau khdng cd sy Idiac biet y ngfaTa ve mat thdng ke. Tir day cd the khdng dinh dii sa d mat do 100 kg/ha va sa d mat do 150 kg/ha thi ket qua sau ciing vdn khdng cd sy khac biet ve sd bdng/m". Cfaung td sa tfaua cdy lua se nay cfadi nhieu han, manfa facm so vdi sa day. Vi vdy nen kfauyen cao ndng dan sa thua se gidm chi phi vh gidng trong qua trinh san xudt va phii hgp vdi khuyin cdo ciia nganh ndng nghidp.
TPNS vd nang sudt vu DX 2010-2011
N$i dung Sd bdng/m^
Chi tieu nong hpc va thanh chac/bong
PIOOO hat
phan nang suSt
NSLT (tSn/ha) NSTT (tSn/ha) Mat do
100 kg/ha 150 kg/ha Y nghTa CV (%) Thuoc hoa hoc Kich khang Biosar Khong xir ly
314.11 322.22 ns 8,54 328,67b 323.00b 302.83a
88,63 86,71 ns 2,34 91,37b 89,72b 81.91a
26.38b 25,80a 0,95
*
26,47b 26,08ab 25.86a
7.20 7.22 ns 7.75 7,89c 7,52b 6,21a
6,66a 6,38b 2,27
*
7,35c 7,14b 5,08a M3t do * sir ly thuoc
, „„ Thuoc hoa hoc . . Biosar
^ Khong xu: ly . -„ Thuoc hoa hoc , . Biosar kg/lia „ , . . . .
Khong xu ly Y nghia CV (%)
322,00 318,67 301,66 335,33 327,33 304,00 ns 2,69
90,94b 88,66b S6,29a 91,82b 90,77b 77,52a 2.52
26,48 26,49 26,17 26,41b 25,67a 25,54a
*
1,19
7,66c 7,41b 6,54a 8,13c 7,63b 5,88a
*
4.10
7,28c 7,14b 5,57a 7,43c 7,11b 4,60a
*
2,47 Cac so trong cung mgt col co cimg chO- giang nhau ihi khong khdc biel & mirc y nghia 5% irong phep ihu Duncan, ns: Khong khdc biel. *: Khdc biel a muc y nghfa 5%; NSKS: ngay sau khi sa.
TP.XS Thanh phdn ndng sudi. NSLT: Ndng sudi lythuyel, NSTT: Ndng sudi thuc te
Giiia hai nghiem thiic sii dung kich khang giam manh mdt each rd ret. trong khi dd hai Biosar va nghiem thiic phun thudc trir benh nghiem thiic xir ly kicfa kfaang Biosar va phun bdng thudc hda hgc thi so bdng khdng khac thudc trir benh bang thuoc hda hgc, sd bdng/m^
biet, tuang duang nhau va cd sy khac biet y gidm nhung khdng dang ke. Cay lua chi cdn cd nghTa so vdi ngfaiem tfaiic khong ySx Iy thudc. sd bdng vua pfaai, gia tdng sd hat chdc/bdng thi Do khdng xir ly thudc khi dich benh xay ra nen tot han la gia tdng sd bdng/m" (Nguyen Nggc so bdng/m' d nghiem thuc khdng xu ly tfaudc De, 1998).
Tgp chi Khoa hgc Tnr&ng Dai hgc Cdn Tha Phdn I Hat chac/bong: Thi nghiem cfao thay: sd hat chdc/bdng khdng cd su kfaac biet giira hai mat dg sa khac nhau, nhung khi cd xir ly thudc trir benfa d^o dn tfai sd hat chdc/bdng cd su khac biet thdng ke vdi nghiem thiic khdng xii ly thudc. Giiia hai nghiem tfaiic cd xii Iy tfai ngfaiem thiic phun tfaudc fada hgc cd sd hat cfaac/bdng cao nhdt (91,37 hat chdc/bdng) d nghiem thiic xii ly chat kich khdng Biosar sd hat chdc/bdng tfadp ban (89,72 hat chdc/bdng) nhung khong khac biet v l thdng ke. Xu ly kich khang khdng Iam tdng sd bdng/m^ nhung gdp phan gia tang sd hat chdc/bdng, ty le hat chdc, trgng lugng 1000 hat. Tir dd giiip gia tdng nang sudt (Hiep Ky Duong, 2010).
Trong luang 1000 hgt: Trgng lugng 1000 hat thudng do ylu td di truyen quylt dinfa vd phu thudc nhieu vao giong. Ket qua thi nghiem cho thdy: trgng iugng 1000 hat cua cdc ngfaiem thiic khoang 25-26g. Nghiem thiic phun thudc thudc hda hgc cd trgng lugng 1000 hat cao han nghiem thiic xix ly Biosar va ddi chirng d mat do 150 kg/faa nhung d mat do 100 kg/faa tfai tuang duong nhau.
Ndng sudt thuc ti (tan/ha)
Bang 5 cfao tfaay mat do sa anfa hudng den ndng sudt, hai mat dp sa khac nhau, nang suat thu dugc tCr hai mat do cung khac nhau cd y nghTa ve mat thdng ke. Ci mat do sa 100 kg/faa cho ndng suat (6,66 tan/ha) cao faon d mdt do sa 150 kg/faa (6,38 tan/ha). Kit qua nay phii fagp vdi nghien ciiu ciia Nguyin Vdn Luat et al., 1998 cho rdng: sa lan d mat do 100 kg/faa gidm dd nga, giam ty Ie lep va cho ndng sudt cao han (cao han 20-30%) so vdi sa lan d mat do 200 kg/faa.
Ddi vdi cac nghidm thiic cd xu ly thudc tfai ngfaiem tfauc phun thudc trir benfa bdng tfauoc hda hgc cho nang suat cao nhdt (7,35 tan/ha), ke den la nghiem tfaiic xii ly cfaat kich khang Biosar (7,14 tdn/faa) va tfaap nfadt la ngfaiem tfaiic ddi cfaimg khdng xii ly thudc (5,08 tdn/ha), khac biet y nghia v l mat thong ke. Cd the gidi thich la do d nghiem tfaiic phun thudc trir benh bdng tfaudc fada hgc, ngoai phun thudc Filia 525SC kit hgp phun them Tiltsuper 300EC vao giai doan trudc va sau trd 1 tuan ngira lem lep
': Nong nghiip. Tltuy san va Cong ngbe Sinh hgc: 2612013/ I-ll hat, lam tang sd lugng hat chdc/bdng, phdn tram hat chac, vi vdy nang suat cao han nghiem tfaiic xir ly kich khang.
Anh hudng ciia sy tuong tac giira mat do sa va xii ly kicfa kfaang len cac tfaanfa phdn nang sudt va nang suat ket qua cho thdy cd su kfaac biet y ngfaTa ro ret, d dieu kien sa mat do vira phai (100 kg/faa) xii ly benfa dao bdng cfadt kicfa kfaang Biosar dn dinfa, cd faieu qud tdt va nang suat tuang duong vdi ngfaiem tfairc pfaun thudc b§nh dao dn tfaeo tdp quan ciia ndng ddn (Nguyen Minh Kiet, 2003). Trong dilu kien sa day xu ly benh vdi chat kich kfadng Biosar khdng hieu qua.
Nhu vay, d mat do sa 100 kg/ha sii dung kich khang Biosar phdng trir benh dao on cd hieu qua tdt han d mat do sa 150 kg/ha. Trong thdi diem benh dao dn phat trien manh, kich kfadng Biosar phat huy hieu qua, giiip ^iam benh dao dn ro ret, giam sd ldn phun thudc va an todn siic khde cho con ngudi.
4 K E T LUAN VA DE XUAT 4.1 Ketlu^n
Ddnh gid hien trgng sdn xuat
Mat tich cue: Dien tich san xuat Iiia cda cac hd trong viing dieu tra tuang doi ldn, quy md sdn xudt rgng va tap trung. Da sd ndng dan y thiic va sir dung gidng cd ngudn goc va dat tieu cfauan tir cdp gidng xac nhan trd len, dp dung gieo sa mat do vua pfaai tfaeo dung kfauyen cao cua nganh ndng nghiep
Mat hgn che: Ndng dan trong viing dieu tra khdng sir dung phan hiru co ma chi sir dung phdn bdn hoa hgc nen phai su dung lugng phan kha cao, tao dieu kien cho sau benh phat trien nen tang sd lan su dung tfaudc BVTV va chi pfai san xudt. Ddi vdi benfa dao dn, tuy da phan ndng dan diu dugc tap huan IPM nhung deu sir dung tfaudc fada hgc pfaun tfaeo dinh ky nen sd Ian phun tuong ddi nhieu, thdng thudng trong mdt 1 lan phun ndng dan su dung nhieu loai thuoc hda hgc (thuoc trir benfa, thudc trir sdu ket hgp vdi pfadn bdn la) nen faieu lyc phdng trir khdng cao, de lam tang ti'nfa khang thudc ddi vdi cac doi tugng sau benh hai.
Top chi Khoa ligc Tnr&iig Bgi hgc Can Tha Phdn B- Nong nghiep. Thiry san vd Cdng ngbe Sinh bgc: 26 (2013): 1-11 Hieu qud cdu Biosar ien benh dgo on
Quan ly benh dao dn bdng each sii dung chat kich khang (Biosar) tir giai doan xir ly hat gidng va pfaun cfadt kich khang vao cac giai do?n 20, 40 NSKG va 60 NSKS (giai doan cd kit hgp pfaun thudc ngira dao dn cd bdng) giiip cd) lua tang kha ndng khang benfa dao on, ty le va chi sd benh faien dien tren rugng tfaap cd faieu qua tuong duang vdi ngfaiem tfaiic phun thudc trii benfa bang thudc hda hgc.
Xu ly benh bdng chat kich khang khdng dnh hudng chilu cao cay, sd chdi, sd bdng nhung gdp phan gia tang sd hat chac/bong, tir dd giup gia tdng nang suat.
4.2 D I xudt
Cdn md rdng trinfa dien md fainfa quan ly dao dn tren dja ban huyen de kfauyin khich ndng ddn giam sir dung thudc fada fagc, iing dung tdt cac gidi pfaap k\ thuat mdi dac biet la su dung chdt kich kfaang pfadng trir benfa dao dn, sir dung cdc che phdm sinh fagc. dam bdo an toan trong san xudt Iiia, gia tang cfaat lugng hat gao trong thdi diem tren dia ban huyen dang chuan bi xdy dung quy trinh sdn xuat an toan ve sinfa tfayc pfadm theo faudng VietGap.
TAI LIEU THAM KHAO
1. Hiep Ky Duong (2010). Khao sat kha nang han che benh hai iua ciia dich trich co hoi (Eupaiorium ordoratum L.) tren giong liia Jasmine 85 tai huyen Cd E>6. TP. Can Tha trong vu HT 2009 va vu HT 2010. Luan an thac sT khoa hoc nganh Bao Ve Thuc Vat Khoa Nong Nghiep ASHLTD, Tmdng Dai hoc C§n Tha, 58 trang.
2. Huynh Minh Chau (2003). Sinh hpc ve su xam nhiem ciia nam Pyricularia grisea tren Iua va kha nang kich thich tinh khang benh dao on liia cua clorua dong \ a acibenzolar-S-methyl tren khia canh mo hoc. Luan van tot nghiep cao hoc chuyen nganh Trong Trot, Trudng Dai hpc Can Tha
3. Hu>nh Minh Chau. Tran Thi Thu Thuy va Pham Van Kim (2002). "Khao sat mo hpc tinh kich khang liru dan cua clorua ddng va Bion doi vdi benh dao on liia (Pyricularia griseay. Hoi thdo Kich thich tinh khdng benh luu ddn, mot chien licoc thdn thien vdi moi trudng de qudn ly
benh tren liia. Du an DANIDA-ENRECA, Dai hoc Can Tha.
4. IRRI, (2002). Standaid E\aluation System for Rice (SES).
5. Le Him Hai (2008). Hieu qua quy trinh qudn ly bin virng benh dom vdn, dao on vd vang Id lua t ^ mpt cgng dong sdn xudt tham canh li^ cao san d huyen Cai Lay, Tinh Tien Giang. Ludn an tiln sT nganh nong n ^ e p . Khoa Nong nghiep
& SHUt), Trudng Dai hoc Can Tho, 182 trang.
6. Le Hihi Hai. Pham Van Kim. Pham Van Du, Tran Thi Thu Thuy va Duong Ngpc Thanh (2006). "Anh hudng ciia benh dao on den nang sudt va chat lupng xay xat ciia lua gao d hai mat do sa va cac lugng phan dam". Tuyen tap cong n-inh nghien cuu Idioa hoc 11/2006. Khoa Nong nghiep & SHLTD, uang 77-82.
7. Ngo Phuang Dai, Dang Thi Tho (2004). Khdo sat khd nang kich thich tinh khang cua acid benzoic, clorua dong va chitosan doi vdi benh dao on Ilia iPyricularia grisea). Ludn van tdt nghiep nganh Nong Hpc, Khoa Nong nghiep &
SHUt), Tnrdng Dai hpc Cdn Tha, 49 trang.
8. Ngo Thanh Tri. Trdn Vu Phin, Nguyin Chi Cuong, Pham Van Kim (2003). "Kha nang kich khang Iini dan ciia CuCL va acibeczola-S- meihyl ddi vdi benh dao dn liia {Pyricularia grisea) ". Hoi thdo kich thich tinh khdng benh luu ddn, mot chien luac thdn thien vai moi trudng de qudn ly benh tren Ida. Du an DANIDA-ENRECA, Trudng Dai hoc Cdn Tha.
9. Nguyin Hong Tin (2005). Khd ndng kich thich tinh klidng benh dgo on lua (Pyiicularia grisea) cua benzoic acid clorua dong vd chitosan tren kliia cgnh sinh hoc vd mo hoc. Luan van tdt nghiep thac si chuyen nganh Trong Trpt, Tniong Dai hpc Can Tha.
10. Nguyen Minh Kiet (2003). Hieu qua cua ba bien phap kich khang trong cac dieu kien phan dam va mat dp sa khac nhau len benh chay la Ilia (Pyricularia griseaj tai tinh Soc Trang.
Luan van thac si khoa hpc nong hpc nganh Trong Trpt Trudng Dai hpc Cdn Tho.
11. Nguyen Ngoc De (2008). Gido trinh cdy lua.
NXB Dai hpc Qudc gia TP H6 Chi Minh.
12. Nguyin Phii Diing (2005). LTng dung chit kich khang CuCL va Oxalic acid de quan ly benh dao on {Pyricularia grisea) tren giong liia OM 1490 trong dieu kien ngoai dong tai huyen Thoai Son. tinh An Giang. Luan an thac sT khoa
Tgp chi Khoa hgc Tnr&iig Dgi hpc Cdn Tho Phan B: Nong nghiep, Thuy san va Cong nghe Smh hgc 26 (2013; l-ll hoc nganh Trdng Trot, Khoa Nong nghiep &
SHUt), Trudng Dai hpc Cin Tha.
13. Nguyen Van Luat, Nguyen Due Thanh, Chu Van Hach and Bui Thi Thanh Tam (1998).
"Study on row-seeding for rice production in die Mekong Delta, Vietnam". Omon rice (6), 147-151.
14. Pham Van Kim (2000). Cac nguyen ly vl benh hai cay trong, Tnrdng Dai hpc CSn Tha, 187 trang.
15. Tieu chudn nganh 10 TCN 982: 2006. Phuong phap dieu tra phat hien sinh vat hai cay trong.
Bp Nong Nghiep & Phat Triln Nong Thdn, Ha Npi -2006.
16. Trinh Ngpc Thuy (2000). Chpn ipc chdt hda hpc CO kha nang kich thich tinh khang benh dao dn lua {Pyricularia oiyzae) d giai doan liia cdn non. Luan van tdt nghiep dai hpc, Tnrdng Dai hpc Can Tho, 64 trang.
17. Trdn Van Phiic (2004). Hieu qua kich khang ciia nam hda chat len benh dao 6n liia khi ap dyng bang each xir Iy hat va phun len la dudi sir tan cdng ciia nam noi nam Pyricularia grisea tai dong bang song Cuu Long. Luan van tdt nghiep ky su Trong Trpt, Khoa Ndng nghiep, Trudng Dai hpc Cdn Tha.
