HOA HOC-CONG NGHE THtfC PHAM
ANH HlTOfNG CUA PHAN BON LA DEN QUA TRINH SINH TRlJdNG, PHAT TRIEN VA CHAT LIT0NG CHE
TAI TINH THAI NGUYEN
• N G U Y I N DLfC TUAN - NGUYEN THU TRANG - LE SY LUY
TOM TAT:
De cay che sinh trtfdng va cho nang suS't tot, chat Itfdng cao, vi6c bdn phan ke't hdp vdi siJ dung phan bon la la bien phap khdng the thid'u. Nghi6n ctfu nham xac dinh so lan phun va nong dd phun phan bdn cua M Green life hdp ly cho qua trinh sinh trtfdng va phat trien cua che LDPl tai Thai Nguy6n.
Ke't qud nghi6n ctfu cho thay, bon phSn chuong u muc ke't hdp vdi sit dung phan bdn la 3 lan d nong dd 0,1% cho nang sua't cao nhS't. Khd'i Itfdng bup che tang hdn 15%; chieu dai bup tang ttf 25 - 26% va mat dp bup tang ttf 25 - 28% so vdi doi chtfng d mtfc y nghia a = 0,05. San phCm che xanh sdn xuat ra cd tdng di6'm chS't Itfdng dat loai td't. Cac chi lieu cam quan, ham Itfdng tanm va flavonoid ttfdng dtfdng vdi che xanh Tan Ctfdng.
Tuf khoa: CSy che, phSn bdn la, sinh trtfdng, che xanh Tan Ctfdng, cha'i Itfdng che. Thai Nguyen.
1. Dgt vS'n d l
Che la loai cay trong lau nam chie'm vi tri quan trong irong stf phat tnen kinh te^ - xa hdi d Viel Nam. Hien nay, che da trd thanh cay cong nghi6p mui nhon, mang lai hieu qua kinh te' cao trong nhdm ndng san xua'l khau chu Itfc. Stf phai trien cua cay che phu thuoc vao nhieu ye'u l6' nhtf:
khi hau, dS't dai, dieu kien cham sdc, dac biet la Itfdng ntfdc va phan bdn. Bdn phan la bien phap ki thuat CO anh htfdng quyel dinh de'n nang suat, chat Itfdng san pham cay trong, hieu qua kinh te va thu nhap cua ngtfdi lam che [5, 7].
Phan bdn la la nguon cung cap cac cha't dinh difdng thie't ye'u dap tfng yeu cau can bang dinh dirdng cua cay che theo ttfng thdi ki sinh trtfdng.
Bdng each cung ca'p phan bdn qua la, hieu qua sd dung phan bdn cd the tang ttf 8-20 lan so vdi bdn phan thdng thtfdng. Cac thi nghiem da chi ra rang, bdn phan qua la cd the tang nang suat itf 12 - 25% khi so sanh vdi viec bdn phan thdng thtfdng [11]. Phan bdn la dtfdc su" dung rong rai trong canh lac rau va cay an qua. Chung cd chtfa cac loai nguyen to'da Itfdng va vi Itfdng can thie't cho stf tang trtfdng va nang suat thich hdp cho cay trong [9, 11]. Ngoai ra, cung cap phan bdn qua la cdn la bien phap trd giup cay trong chd'ng Iai nhffng thay ddi va dieu kien thdi tie't khac nghiet[l].
Phan bdn la Green life dtfdc san xua't tai Trtfcfng Dai hoc Nong Lam Dai hoc Thai
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TAPCHiCONGTHlTGlNG
Nguyen, trong thanh phan cd chat chiet xua'l ttf ca giup cay che sinh trtfdng, phat trien to'i va l^m lang kha nang de khang cua cay do'i vdi mot so' benh hai. Khi sii dung phan bdn la, cha't Itfdng che da dtfdc cai thidn ro ret so vdi khi khdng sijf dung.
Cac thanh phan cd Idi trong che tang ldn dang kd' nhtf protein, glucid, axil amin, polyphenol, caffeine.,. Blip che non rat giau hdp chat polyphenol va flavonoid.
Day la thanh phan chinh quye't dinh dd'n htfdng thdm, mau sac, miii, vi, dp sanh cua ntfdc che [8]
va mang nhffng dac linh cd Idi cho stfc khoe con ngtfdi [10]. Mac du, phan bdn la cd nhieu tfu die'm trong canh tac che nhtfng nd van chtfa dtfdc sur dung rong rai trong mo hinh san xua'l d Viet Nam. Do do, muc dich cua nghien ctfu nay la danh gia anh htfdng cua phan bdn la Green life tdi nang suS't va chS'l Itfdng che sau thu hoach tai Thai Nguydn.
2. Vat lieu va phtfdng phap nghien cvlu 2.1. Vdt lieu nghien ciiu
Chd' phS'm phan bdn la Green life dtfdc san xua't tai Khoa Cong nghd Sinh hoc va Cong nghd Thtfc pham, Trtfdng Dai hoc Ndng Lam- Dai hpc Thai Nguyen; va gid'ng che LDPl 5 nam tudi dtfdc dd'n hang nam vao vu ddng. Cac thi nghiem dtfdc tid'n hanh tai xdm CSy Xanh. xa Quyel Thang, TP. Thai Nguyen, tinh Thai Nguydn.
2.2. PhiiOngphdp nghien cdu 2.2.1. Bo tri thi nghiem
De tai gdm 3 thi nghiem nghien ctfu khac nhau. Trong do, ihi nghiem TNI gom 4 cong thtfc, TN2 gdm 6 cdng thtfc dtfdc nhac Iai 3 l^n, theo doi d 3 Itfa lien tie'p nhau, kho'i Itfdng 6 thi nghiem la 10 m^ che cho mdi lan lap. Cac thi nghiem TNI (so' lan phun: 1 - 3 lan d ndng dp 0,1%), TN2 (ndng dp phan bdn la: 0 - 0,5% vdi sd lan phun td't nha't d TNI) su" dung che' pham Green life va nen la 7 ta'n phan chuong u muc cho 1 ha. Chd' pham phan bdn la dtfdc hoa tan 6 cac ndng dp quy dinh, rdi tie'n hanh phun tfdl ddu trdn ca hai mat la che. Phun ngay khi cay che dtfdc thu hai loan bp bup cua Itfa che trtfdc, cac Ian tid'p theo dmh ky phun 7-10 ngay/lan.
Theodoi va phan tich cac chl lidu trong TNl- TN2 nhtf khdi Itfpng bup, chieu dai bup va mat do bup che. Ttf kd't qua cua TN I va TN2, chpn ra
dtfdc sdldn phun va ndng dd phun phSn bon la tdt nha't de su" dung cho TN3 vdi loan bp md hinh che thi nghidm. Chat Itfdng che xanh thanh pham ciia TN3 dtfdc so sanh vdi san pham che cung gid'ng canh tac trdn dia ban ISn can trong tinh Thai Nguyen, la: xa Phuc Thuan, huyen Phd Yen va xa Tan Ctfdng, TP. Thai Nguydn.
2.2.2. Cdc chi tiiu vd phuc/ng plidp ddnh gid Khd'i Itfdng trung binh ciia 100 blip (g/100 blip): Tren cac 6 thi nghiem hai 100 blip nglu nhidn, bao quan rieng trong cac tui nilon. Can 100 blip ngau nhien 3 Ian, linh trung blnh 3 lande dtfdc khd'i Itfdng binh quan 100 blip.
Chieu dai blip (cm): Moi d thi nghidm chpn 5 diem theo doi theo phtfdng phap dtfdng cheo gdc.
Mdi diem theo doi 10 blip, chpn cac blip phat trie'n binh thtfdng, theo doi sinh trtfdng blip tren canh che, tie'n hanh do chieu dai ttf diem giffa ciia la thtf 2 va la thtf 3 dd'n dmh sinh trtfdng cua bup che.
Mat do biip(biip/m-): Dung khung vudng kich thtfdc 25x25 cm, dien tich 0,0625 m^ dat trdn 5 diem theo ddi d cac vi tri khac nhau. Dem tat ca so' blip dat tieu chuSn, lay tri so' trung binh nhan vdi 16 se thu dtfdc mat dd bup/m^ theo ddi vao cac Itfa hai chinh.
Chat Itfdng cam quan cua san ph^m che xanh (ngoai hinh, mau ntfdc pha, miai va vi) dtfdc danh gia bang phtfdng phap cho did'm tdng hdp theo TCVN 3215-79. Tieu chuan sff dung he 20 di^m, xay dtfng tren mot hd ihang diem thd'ng nha't co 6 bSc (0 - 5) vdi diem 5 la cao nhai cho I chi lieu [4].
Thanh phan flavonoid long so' dtfdc xac dinh bang phtfdng phap so mau iren may UV-VIS V630, mau trang sff dung ntfdc ca't [6]. Xac dinh ham Itfdng tanin bang phtfdng phap Leventhan [3].
2.3. Xiily so lif u
T^t ca so' lieu thi nghiem deu dtfdc tong hdp va xff ly thd'ng kd bang chtfdng irinh Microsoft Excel 2010 va phan mem SPSS 20.0.
3. Kd't qua va thao lugn
3.1. Anh hudng cua solan phun phdn ton Id de'n qud trinh sinh trddng vd phdt trien cua cdy che
So lan phun phan bdn la anh htfdng rat ldn de'n qua tiinh sinh trtfdng va phat trie'n cua cay
352 So 5 - Thang 3/2020
HOA HOC CONG NGHE IHUC PHAM
che. Trong dd, nang suai phu thupc ra't nhidu vao bidn phap canh tac va miia vu ihu hoach. Tie'n hanh phun phan bdn la Green life d ndng dp 0,1 % vdi sd'l^n phun khac nhau, ke't qua dtfdc trinh bay dBang I.
chi tidu mat do bup. Cay sinh trtfdng va phat trien manh me se cd kha nang biit bup manh. Vi vay, mSt do blip vffa phan anh tinh hinh sinh trtfdng cua cay, vffa the hidn ye'u to'ca'u thanh nang sua't cay che vdi ty le itfdng quan thuan [2]. Mat dp
Bang 1. Anh hadng cua sd' l6n phun phan bon la de'n qud trinh sinh tn/dng vd phdt trien cua cdy che
Solanphun(0,1%) D/C {Nen + Khong phun}
CTI (Nen + phun 1 lan) CT2 (Nen + phun 2 lan) CT3 (Men + phun 3 lan)
Khoi liigngbup(g/100bup) 37,12' 41,62' 42,03»
42,98'
Chieu dai bup (cm) 2,65«
2,99' 3,11' 3,32'
IUI(itdObup(bup/m') 200' 249' 256' 267- Ghi chu: Ttong cung mdt col. cac gia tri mang cung chO sotnu ia khdng khac nhau d y nghia =0 05
Khd'i Itfdng blip la do dac did'm di truyen cua gidngquy dinh va do mot phan ky thuat cham sdc nhtf sff dung diing loai phan bdn, diing ky thuat va dung thdi diem. Stf tang kich thtfdc cua blip dan tdi tang pham cap ciia che nguyen lieu va lam nang sua't tang len. Bang 1 cho tha'y, 8 cOng mot ndng do phan bdn la 0,1%, kho'i Itfdng blip che 1 tdm 2 la tang len iff 12,12 - 15,79% itfdng ling vdi s6' Ian phun iff 1-3 lan d mtfc y nghia a = 0,05. O cac cong thtfc phun phan bdn, la che xanh, day va map hdn so vdi do'i chtfng. Ke'l qua sff dung phSn bdn la Green life phun 2-3 lan tha'p hdn vide sff dung phan bdn la Ni-Phos-K va A-K- Bac A, nhtfng cao hdn so vdi sff dung phan Agriseeds-MG ve kho'i Iffdng bup che [1].
Blip che la mot doan non cua canh che, dtfdc hinh thanh tff cac mam dinh dtfdng. Hoat dpng sinh trtfdng cua bup theo mot quy luat nha't dinh va hinh thanh nen cac ddt sinh trtfdng theo thff tff thdi gian. Chieu dai bup phu thupc ra't Idn vao bien phap canh tac va didu kien khi hau. Ke't qua danh gia chieu dai bup d cac cong thtfc thi nghidm sff dung phan bdn la Idn hdn, dieu nay cd y nghia so vdi cdng thtfc dd'i chtfng ttf 12,83 - 25,28% d dd tin cay 95%. Trong dd, cdng thtfc CT3 (phun 3 Ian) cho chieu dai blip ldn nhat, chieu dai blip giam dan d CT2, CTI va thap nha't
^ cong Ihtfc dd'i chtfng.
Kha nang bat mam cua cay dtfdc the hien qua
bup/m- cd stf thay doi gitfa cac cdng Ihtfc, d cdng thtfc thi nghiem CTI- CT3 (1-3 lan phun) mat dd blip che lang tff 24,5 - 28% so vdi dd'i chtfng. Mat dp blip d cdng thffc phun 3 lan cao hdn 67 bup/m^
so vdi dd'i chtfng d mtfc y nghia a =0,05. Mat dp blip che d cdng thtfc CT3 cho kd't qua ttfdng dtfdng khi sff dung phan bdn A-K-Bac A va cao hdn Sd vdi che sff dung phan bdn la Ni-Phos-K va Agriseeds-MG [1].
Nhff vay, so' lan phun phan bdn la anh htfdng cd y nghTa de'n kho'i Itfdng, chieu dai va mat dp bup che. Ke't qua trdn cho tha'y, khi phun phan bdn, ngoai Itfdng phan chuong cdn dtfdc bd sung mpi Itfdng nguydn to' da, vi Itfdng cd kha nang phan giai nhanh, giiipcay sff dung dtfdc dd d^ng.
Viec phun 3 lln d nong do 0,1%, mdi lln each nhau 10 ngay cho ke'l qua td't nhS't.
3.2. Anh hudng cua nong do phdn ton Id de'n qud trinh sinh trddng vd phdt trien eua cdy che
Vdi ke't qua thu dtfdc d thi nghiem 1 (3 lan phun), chung toi tid'p luc danh gia anh htfdng cua cac ndng dp (0,1 - 0,5%) phan bdn la dd'n cac ye'u id ca'u thanh nang sua't che. Bang each theo doi didn bie'n kho'i Itfdng, chieu dai va mat dp bup che qua cac Itfa d cac ndng dd khac nhau, ta thu dtfdc kd't qua trong Bang 2.
Bang 2 chi ra iren ciJng mdt nen phan bdn, khdi Itfdng blip qua cac Iffa tang trtfdng ttfdng ddi manh, cu the': khdi Itfdng blip cua cac cdng thtfc
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Bang 2. Anil hudng cua nong do phun phan bon 16 den qua tiinh sinh hadng vd phdt trien cua cdy che
N6ng d6 phun (%) D/C (Nen + phun nudc la) CTI (Nen + phun phan bon la 0,1%) CT2 (N j n + phun phan bon la 0,2%) CT3 (Nen + phun phan bon la 0,3%) CT4 (Nen + phun phan bon la 0,4%) CT5 (Nen + phun phan bon la 0,5%)
Khoi iUdng bup (g/100 bup) 37,27- 43,02' 40,53' 38.51' 37,78' 37,41d'
Chieu dai bup(cm) 2,70"
3,41- 3,08' 3,00b' 2,91' 2,87'
M$td0bup(bijp/m^
200,03"
257,67' 247,67' 245,67' 229,67' 214,33"
Ghi chu: Ttong cung mot cot. cac so co chl somO giong nhau ia khong khac nhau d y nghla a = 0.05
thi nghidm (CT1-CT5) tang cao hdn sd vdi dd'i chtfng Itf 0,38-15,43%. Che sff dung phan bdn la sinh trtfdng va phat trid'n cao hdn, blip dai, map va xanh hdn dd'i chtfng. Chieu dai blip che khi sff dung phSn bdn la d cac ndng do (0,1-0,5%) cho kd't qua cao hdn dd'i chtfng,
Cu thd', phun phan bdn la vdi ndng do 0,1%
cho kich thtfdc bup phat trien td't nha't, chieu dai trung binh cua bup che dat 3,41cm - cao hdn dd'i chffng 0,71cm. Ndng dd phun phan bdn la cang cao Ihl chieu dai blip cang giam dan - Itf 26,3%
xud'ng cdn 6,3% so vdi dd'i chtfng. 0 cac ndng dp phun khac nhau cho mat do bup khac nhau d mffc y nghia a = 0,05. O ndng dp 0,1%, mat do bup lang 25,84% (hdn 57,67 bup/m-) so vdi dd'i chtfng, bup che d ndng dd nay phat tridn ddng deu, blip dai va map hdn so vdi cac cdng thffc khac irong de lai. Ttf CT3 - CT5, mat dp bup gidm dan.
Kd't qua thtfc nghidm cho tha'y khi phun che LDPl dndngdd ttf 0,2-0,5% vdi tan sua't 7 - 10 ngay/lan, cay che nhan dtfdc qua nhidu cha'l dinh
dtfdng nhtf ham Itfdng nilrat dSn ddn mat dp blip giam dan va la che dan chuyd'n thanh mau xanh dam. Tdm lai, ndng dp phun phan bdn la anh htfdng cd y nghla dd'n khd'i Itfdng, chidu dai va mStdd blip che. Phun phan bdn la 3 lan vdi ndng dp 0,1% chd kd't qua cao hdn cac cdng thtfc thi nghiem khac trong dd tai.
3.3. Anh hudng cua phdn bdn Id tdi chdt lUotng che xanh thdnh phdm
Vdi 3 l^n phun d ndng dp 0,1%, mdi lan phun each nhau 10 ngay cho loan bg mo hinh che ihi nghiem (che Quyd't Thang). Cha't Itfdng che xanh thanh pham dtfdc so sanh vdi s5n pham che ciang gid'ng canh lac tren dia ban 13n cSn trong tinh Thai Nguyen la: xa Phtic ThuSn, huydn Phd Yen (che Phuc Thuan) va xa Tan Ctfdng, Thanh phd Thai Nguyen (che Tan Ctfdng). Kd't qua dtfdc Irinh bay d Bang 3 va 4.
Kd't qua phan tich phtfdng sai 6 mtfc y nghla a
= 0,05 ve cac chi lidu cam quan cua 3 mau che tai cac viing che khac nhau la khac nhau. Che dtfdc
Bang 3. Anh hu6ng cua phdn bdn Id den diem trung binh cdc ctiFtieu cdnn quan ctie
^ " ^ ~ ^ ^ ~ ^ ^ ^ ^ Chl tieu Vung che - - ^ ^ ^ Che Quyet Thang
Che Tan Cuong Che Phuc Thuan
Ngoai hinh 4,4- 4,6' 3,7' Ghi chu. Cac gia In ttong cung mdt cot co ch
Mau sac 4,3»
4,4' 3,6'
nia
A.T
4,6- 3,9'
Vl
4,9' 4,7- 3,9' somu khac nhau thi khac nhau co t
"iSng di^m chat iuong 18,26 18,28 15,22 ghJa d muc
chat iodng Tot Tot Kha
"; n = 0,05
354 So 5^ Thang 3/2020
HQA HOC-CONG NGHE THITCPHAM
Bang 4. Anh hudng cua phdn bdn Id den ham li/dng tannin vd flavonoid trong che
^~~"~--~...„.^^^ Chl tieu Vung che ^'"^--.^.^^^
Che Quyet Thing Che Tan CUOng Che Phuc Thuan
Tanin
(%)
30,16 29,86 33,68
Fiavonoid
(%)
21,66 21,56 17,85
phun phSn bdn la Green life cho long didm cha't Itfdng dat loai lot. Tong diem chat Itfdng cam quan cua che Quyd't Thang (18,26) cao hdn h3n che Phuc Thuan (15,22); itfdng dtfdng vd cac chi tidu ngoai hinh, mau sac, mui va vi vdi che Tan Ctfdng (18,28) - ndi dtfdc coi la viing che nd'i tie'ng nha't cua linh Thai Nguyen. Dieu nay chtfng id cdng Ihtfc phun ph3n bdn la cho chat Itfdng cdm quan td't nhtf: chi lidu ve mui va vi cao nha't, che cd mill thdm ttf nhidn, de chiu, cd vi chat diu va hau vi ngot dac trtfng ciia san pham loai td't.
Tanin va flavonoid la hai thanh phan chiem ty le cao trong che. Ham Itfdng tanin quyd't dinh
dd'n vi chat irong che, trong khi ham Itfdng flavonoid quyd't dinh dd'n mau sSc va htfdng thdm cua che.
Qua Bang 4 cho tha'y ham Itfdng tanin va flavonoid ciia che Quye't Thang va che Tan Ctfdng ttfdng dtfdng nhau. Ham Itfdng tanin Irong che Phuc Thuan cao nha't va flavonoid tha'p nha't trong cac loai che dtfdc danh gia, Ke't qua nay phii hdp vdi ldng diem chat Itfdng cam quan lai cac vung che dtfdc danh gia d Bang 3.
4. Ke't Iu§n
Sd'lanphun va ndng do phun khac nhaucd anh htfdng rd ret de'n qua trinh sinh trtfdng va phat trien cua cay che LDPl 5 nam tudi tai Thai Nguyen.
Phun phan bdn la Green life 3 lan d ndng do 0,1%
cho nang sua't cao nha't. Khd'i Itfdng blip che tang hdn 15%; chieu dai bup tang ttf 25 - 26% va mat do bup tang ttf 25 - 28% so vdi dd'i chtfng.
Bdn phan chuong kd'l hdp vdi su" dung phan bdn la cho tdng diem ch3't Itfdng che xanh thanh pham dat loai td't. Cac chi tidu ve ngoai hinh, mau sac, miii, vi, ham Itfdng lanin va flavonoid ciia che Quyd't Thang dtfdc ddnh gia Iffdng dtfdng vdi che Tan Ctfdng •
TAILIEUTHAMKHAO:
/. Lan Anh Phdp (2014). Nghidn cdu dnh hudng ciia mot sd loai phdn bon Id den sil sinh trudng. ndng suat vd chdt luang che trung du tqi Trudng Dai hoc Ndng Ldm ndm 2014. TrUdng Dai hoc Nong Ldm - Dai hoc Thdi Nguyen.
2. Hodng Thi Le Thu, Nguyen Dinh Vinh, Do Vdn Ngoc (2013) Anh hudng ciia phdn bon vd ddn de'n ndng sud't, chdt tuipig nguyen lieu che bien che Q Long tai Phii Tho. Tap chi Khoa hoc vd Phdt trien, tdp 11, sd4:492:500.
3 va Thi Thu. Doan HUng Tien, Do Thi Gdm. Giang Trung Khoa (2011). Cdc hap chd't cd trong che va moi so phuang phdp phdn tich thdng dung trong sdn xud't che d Viit Nam. NXB Nong nghiep Hd Noi, tr. 72-110.
4. Pham Xudn Vuang (2007). Gido trinh kiem tra chdt luang thUc phdm. NXB Hd Noi.
5. Anonymous (2002). Tea Growers Hand Book. 5th Edition. Tea Research Foundation of Kenya. Elizer Services Publishers. Times Printing Services. Nairobi
6. Chang CC, Yang M.H., Chern J.C (2002). Estimation of total Jlavonold content in Propolis by two complementary colorimetric methods. Journal of Food and Drug Analysis, 10 (3): 178-182.
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9. Karak. T. and Bhagat. R. (2010). Trace Elements m Tea Leaves. Made Tea and Tea Infusions: A Review. Food Research International, 43. 2234-2252.
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TAP CHi CONG THIfdNG
10. Konur. G.. Venkatesan. S.. Kumar. R. and Murugesan. S. (2010). Influence of seasons on Biochemical Parameters of Green Shoots and Quality Parameters of Made Tea under South Indian Conditions Journal of Bioscience Research, 1. 74-82.
11. Woldegebriel, D. (2007). Levels of Essential and Non-Essential Metals in Commercially Available Ethiopian Black Teas. Addis Ababa University. Ethiopia.
Ngay nhan bai: lllllliSlii
Ngay phan bidn flanh gia va su'a chCa: 27/2/2020 Ngay cha'p nhSn dang bai: 6/3/2020
Tliong tin tdc gid:
1. ThS. NGUYIN DCC TUAN 2. NGUYEN THU TRANG 3.LESYLUY
Khoa Cdng nghd Sinb hoc va Cong nghd Thtfc ph^m Trtfdng Dai hpc Nong Lam - Dai hpc Thai Nguydn
EFFECTS OF FOLIAR FERTILIZER APPLICATION ON THE GROWTH, DEVELOPMENT AND QUALITY
OF TEA IN THAI NGUYEN PROVINCE
• MSc. NGUYEN DUC TUAN
• NGUYEN THU TRANG
• LE SY LUY
Faculty of Biotechnology and Food Technology, Thai Nguyen University of Agriculture and Forestry
ABSTRACT:
This study was to determine Ihe reasonable number of sprays and concentration of Green hfe foliar spray for the growth, development and high quality of LDPl tea in Thai Nguyen province. The study's resuUs have identified the number of sprays and foUar concentration which had a significant effect on the growth and development of tea plants. Applying composted manure combined with foliar fertilizer application 3 times at a concentration of 0.1 % gave the highest yield. Volume of tea buds, bud length and bud density increased more than 15%: 25 - 26% and 25 - 28%, respectively when compared to the control at significance level a
= 0,05. The green tea had a good total quality score. The sensory, tannin and flavonoid contents were similar lo Tan Cuong green lea.
Keywords: Tea tree, foliar fertihzer, growth, development, Tan Cuong gree^ :._ ,, quahty tea. Thai Nguyen province.
3 5 6 Sd 5 - Thang 3/2020
