KHOA HOC CONG NGHl
AMH HUQIMG CLIA PHAIM BOIM LA [MAIVO KEIVI OXIT DEIM SIIMH TRUOIMG, PHAT TRIEIM, IMAIMG S U A T , CHAT LUqiMG CAIVI 5AIMH TROIMG TAI HAIVI YEIM,
TUYEIM QUAIMG
Dang m Hdng Phuong^^^ ' M n Qudc Toan^ Ha XuSn Linh*
T6MTAT
Trong cac chat dinh duong vi luong, kem (Zn) dong vai tro cho su sinh tniong va phat trien ciia cay tr6ng.
Hi$n nay tr^n the gioi, tinh trang thieu kem xay ra d nhieu loai d^t trong tren nhieu cay trong, dac bi^t la cay CO miii. Phun nano kem oxit qua la duoc coi la phuong phap don gian nhung Ijii cd hieu qua d l cung cap lupng VI luong k e m thilt y l u cho cay trong. Nghien cuu nay duoc thuc hien vao nam 2019 nham danh gia hieu qua cua phan bdn nano ZnO toi sinh trudng, phat triln, nang suat va chat luong cam Sanh {Citms nobili^ a Ham Y6n, Tuyen Quang. Trong 1 vu duoc phun nano ZnO voi 4 lieu lugng khac nhau dupc coi nhu 4 cong thuc: 50 ppm 2 n 0 / v u , 100 ppm ZnO/vu, 200 ppm ZnO/vu, 400 ppm Z n O / v u cimg mpt cong thiic ddi chung khong phun nano ZnO. K^t qua thi nghifim cho thay, cong thuc phun 200 ppm ZnO/vu cho cay sinh trudng, phat tri^n tot nhat, nSng suat cao nhat (tang 32,9% so vdi cong thuc ddi chiing). K^t qua nghidn cihi nay co y nghia quan trong trong viec su dung hpp ly phan bon nano ZnO nhSm cai thi§n nSng sudt, chat luong cam Sanh o Vi&t Nam.
Tir khda: Phan bon, ZnO, cam Sanh. Tuyen Quang, sinh trudng, nSngsuit, chit luong.
I.BATVAUfiE
C a m s a n h {Citrus nobiS^ la m g t loai q u a cd miii cd n g u o n goc Vi6t N a m , la g i d n g lai giiia c a m c h a n h {C.
Sinensis) va q u y t (C. reticuulata), c o gia tri d i n h d t r o n g v a hifeu q u a k i n h te c a o , dk sii d u n g va d a n g d u g c tra c h u o n g tc^n thi t r u o n g . O Viet N a m , c a m S a n h d u o c t r d n g n h i e u o c a c t i n h m i e n n u i p h i a B a c n h u T u y e n Q u a n g , H a G i a n g , Y e n Bai... c h o n a n g s u ^ t va c h a t l u p n g c a o ; d a va d a n g d u g c coi la c a y t r o n g c h u d a o g d p p h a n x o a d o i g i a m n g h e o , l a m g i a u c h o n h a n d a n dia p h i r o n g [1-2]. T u y n h i e n , h i e n n a y n a n g s u a t , chjit l u g n g c a m S a n h k h d n g o n d i n h d o s u b i e n ddi k h i h a u va tinh t r a n g t h i ^ u c h a t d i n h d u o n g , d a c bifet la c a c c h a t d i n h d u o n g vi l u p n g [2]. T r o n g c a c c h a t d m h d u o n g vi l u g n g , k e m (Zn) cd vai tro r a t q u a n t r p n g , a n h h u d n g t r u e tiep d e n q u a t r i n h sinh t r u d n g , p h a t h i e n v a n a n g s u a t c a y t r d n g [3-5]. N h u c a u k e m c u a c a m S a n h k h a Idn, t h i e u k e m c a y d l r u n g h o a , la va q u a , l a m s u y g i a m c h a t l u g n g q u a n e n viec b d s u n g k e m vdi lieu l u p n g t h i c h h g p la m g t bi6n p h a p h u u h i e u d e cai t h i e n n a n g s u a t va c h a t l u o n g c a m
' Truong Dai hoc Nong Lam, Bai hpc Thai NguySn
" Trung tam Nhiet doi Viet - Nga
' Truong Dai hpc Su pham, Dai hpc Thai Nguyen
"• Khoa Qu6c t i Dai hgc Thai Nguyen Email: h,i\ii.inhnhl?^liui.edii.MI
S a n h [6]. P h a n b d n k e m t h i r o n g la c a c h p p chsit vo CO, c a c c h e l a t t o n g h o p , k h i vao dat d^ hi rira hdi, h i e u q u a t h a p , t r o n g t r u d n g h g p p H d a t c a o , c6 th^
g a y n g o d p c va g a y c h u a d a t . T h e o c a c n h ^ k h o a hpc, h i e u s u a t s u d u n g c h a t d i n h d u o n g q u a la dgt tdi 95%, c o n b o n q u a dat, c a y c h i sir d u n g d u p c 45-50%. Hifin n a y t r e n t h e gidi, p h u n n a n o oxit k g m q u a la d u g c coi la p h t r o n g p h a p d o n g i a n , h i e u q u a d^ c u n g c^p l u p n g vi l u p n g k e m t h i e t y e u c h o c a y t r o n g [7-8].
N h o CO k i c h t h u o c n h o , b o a t tinh p h a n u n g cao, cac h a t n a n o o x i t k e m c d t h e d e d a n g x a m n h ^ p vao cac t^ b a o la d e t h a m g i a v a o q u a t r i n h t d n g h p p cac e n z y m e c a n t h i e t c h o q u a t r i n h t r a o d d i c h ^ t cua c a y [7-8]. 6 n g h i e n c u u t r u d c [9] c h i i n g tdi d a ch^
t a o t h a n h c o n g n a n o o x i t k e m ( c o k i c h t h u d c hat 20-60 n m m ) b a n g p h u o n g p h a p d i e n h d a . Nghidn ciiu n a y d u p c tien h a n h n h a m d a n h g i a h i e u q u a ctia p h a n b d n n a n o oxit k e m k h i p h u n q u a la tdi sinh tinrong, p h a t h i e n , n a n g s u a t va c h a t l u p n g c a m Sanh t r o n g tai H a m Y e n , T u y e n Q u a n g .
2. VJiT UEU VA PHUDNG PHAP IWHBI CUU 2.1. V$t li$u, d i a d i ^ m v a thin g i a n nghifin c u u
- Ddi tirong nghi&n c u u : T h i n g h i e m d u o c t h u c h i e n h-en g i d n g c a m S a n h 8 tiioi, d a c h o q u a , dugc n h a n g i d n g b a n g p h u o n g p h a p g h e p .
NONG NGHIEP VA PHAT TRIEN NONG THON - KY 2 - THANG 9/2020
KHOA HOC C d N G N G H £
- vat lieu nghidn cuu: Phan bon nano kem oxit CO kich thudc hat tu 20-60 nm, dupc pha trong nuoc c^t hai Ian vdi cac ndng dp thich hgp, sau do dem rung sieu am trong 10 phut, d^ lang rdi cho vao Ig bao quan.
- Dia di^m va thdi gian nghien cmi: Tlii nghiem duoc tien hanh tai huydn Ham Ydn, tinh TuySn Quang trong nien vu 2019.
2.2. Phuong phap nghidn cihi
- Bd tri thi nghi&m: Thi nghiem dugc bd tri tren vudn cam Sanh trong sSn cua nong dan theo phuong phap ngSu nhifin ddy du gom 5 cdng thirc khac nhau ve nong do nano kem oxit, mdi cdng thiic 5 cay cd kich thudc gan nhu nhau, mdi d 1 cay, cac 6 each nhau it nhat 1 cay, nhac lai 1 lan. Thtri diem hoa no rd dugc tinh khi cd 50% sd hoa tren cay no.
Cac cong thiic bao gom:
Cong tinic 1 (CTl - ddi chiing): phun nuoc la (0 ppm ZnO/vu); Cong thiic 2 (CT2): phun dung dich nano ZnO, 50 ppm ZnO/vu; Cdng thirc 3 (CT3): phun dung dich nano ZnO, 100 ppm ZnO/vu; Cong thiic 4 (CT4); phun dung dich nano ZnO, 200 ppm ZnO/vu;
Cdng thiic 5 (CT5): phun dung dich nano ZnO, 400 ppm ZnO/vu.
- Thdi gian phun: Mn 1 phun sau khi hoa tan, Idn 2 phun each lan 1 la 10 ngay, lan 3 phun khi qua Ion khoang 1 cm. Phun uot toan bg than, la cay cam Sanh khi trdi ram mat.
- Vi^c phan tich, theo doi va chSm soc thuc hifen ddng d6u h-fen vuon thi nghiem theo qui trinh cham sdc cay cam Sanh [1-2].
- Sd Ii6u dugc tong hpp va xu ly thdng ke bang phan m^m Excel va SAS 9.0.
2.3. cac chi ti6u vk phuong phap theo ddi - cac chi tidu ve ti le dau qua dugc theo doi m6i
cay 3 canh, phan bo deu 6 cac huong tang rdi tinh tiTmg binh. Ti 16 dau qua sau tat hoa (%); tdng so qua dau/tdng sd hoa theo doi.
- Dgng thai tang truong duong kinh qua; diing thuoc Pamer do duong l<inh qua va chieu cao qua, m6i cdng thiic do 30 qua dupc danh dau co dinh tren cay phan bo deu o cac huong va cac tang tan, dinh ky 20 ngay theo doi 1 lan.
- Cac chi tieu nang sudt va yeu td cau thanh nang suat dugc theo doi tren ca cay bao gdm: So qua ti-fen cay (qua/cay), nang suat qua tren cay (kg/cay).
Khdi luong qua tiimg bmh (g/qua): Can mdi cay 30 qua rdi tinh trung binh.
- Cac chi tieu ca gidi qua: dupc theo doi m6i cay 30 qua co kich thuoc khac nhau va d cac vj tri khac nhau trgn cay. Chieu cao qua (cm): Diing thudc kep do tii cudng qua tdi day qua; duong kinh qua (cm):
Do 6-vi tri to nhat qua; ti le an dugc (%): Khdi lugng thit qua/tdng khdi lugng qua; sd hat trung binh tren qua (hat/qua): Dem sd hat ciia tiing qua roi tinh h-ung binh.
- Cac chi hfeu ch^t lugng qua: Ham luong chat khd (%) xac dinh bang phuong phap say kho den dp am khong ddi; nong dp chat ran hoa tan (%) dupc do bang Brix ke; ham lupng axit tdng so (%) xac dinh bang phuong phap trung hoa; him lupng duong tong so (%) xac dinh bang phuong phap Bertrand; ham lugng vitamin C (mg/100 g qua) xac dmh bang phuong phap sac ki long hieu nang cao.
- Cac chi tieu v^ sau benh hai: Tlieo doi va danh gia anh hudng cua sau bfinh hai ddn mau ma qua/cdng thiic/gidng cam Sanh.
3. KFT QUA VA HMO LUAN
3.1. Anh hudng cua nano kem oxit d^n thdi gian ra hoa, ti I^ dau qua cam Sanh
C6ng thiic
CT1(DC) CT2 CT3 r CT4
Bang 1. Anh hudng cua nano kem oxit d^n thdi gian ra hoa, ti le d^u qua cam Sjtoh Ngay bdt
d^u no- hoa (10%) 15/03/2019 14/03/2019 13/3/2019 13/03/2019
Ngay hoa nff rp
(5096) 25/03/2019 24/03/2019 23/03/2019 23/03/2019
Ngay ket thiic nd hoa
(20%) 10/04/2019
9/04/2019 7/04/2019 7/04/2019
Thdi gian tir nd hoa den ket thiic hoa (ngay)
27 27 26 26
So hoa theo doiban ddu/canh (hoa/canh)
739,33 770,23 758,34 725,56
So qua dau sau tat hoa/canh (qua/canh)
54,28 73,27 80,53 87,13
Ty le dau qua sau
tat hoa
(%)
7,43' 9,51'^
10,62*
12,00"
KHOA HOC C 6 M 0 HOHt
CT5 LSD„„
CV%
13/03/2019 24/03/2019 8/04/2019 27 705,21 76,14 10,80*
2,21 12,05 Ghi chu: Cac gia tried chusddikem khac nhau bieu thi sukhac nhau cdy nghia a muc.xac suit 9596.
Kha nang ra hoa, dau qua phu thupc vao tinh trang sinh trudng va phat trien cua cay, anh huong true tidp d^n nang suat cam Sanh. Ket qua bang 1 cho thay, o cac cong thirc cd phun nano kem oxit (CT2-CT5) thoi gian bat dau ra hoa co xu huong sdm 1-2 ngay so vdi cong thiic ddi chung (khdng phun nano ZnO), con thoi gian tir khi cay bat dau no hoa den khi cay ket thiic nd hoa hau nhu khong bi anh hudng. Cong thuc CT3, CT4 cho thoi gian ra hoa va k^t thiic hoa sdm nhat (sdm hon 2 ngay so voi cong thuc ddi chiing). Cac cong thiic phun nano kem oxit d^u cho ti 16 dau qua cao hon ddi chimg, trong do CT4 (phun 200 ppm ZnO/vu) co ti le diu qua cao nh^t (12,00% d miic dp hn cay 95%). Dieu nay c6 th^
la do CT4 da cung cap vi lupng kem cho cam Sanh
trao ddi chat va tao ra Tritophan (ti^n than ciia auxin) giiip tang ti le dau qua va giam ti le rung qua cua cay [6].
3.2. Anh hudng ciia nano kem oxit d ^ d0ng thii tang tioidng kich thudc qua cam Sanh
Kich thudc qua (the hien bang chi^u cao va dudng kinh qua) la mgt trong nhiing yeu td cau thanh nang suat, anh hirdng true hep den nang suat cam Sanh. Cd nhieu bien phap tac dgng de tang kich thudc qua nhu: gidng, phan bdn, sii dung chat dieu hoa sinh trudng, mat dp trong... trong do bien phip phan bon dupc ling dung kha phd bidn. Sv anh hudng ciia nano kem oxit d^n dpng thai tang tnrdng kich thudc qua cam Sanh Ham Y6n dupc trinh bay d bang 2.
mgt each can ddi, phii hgp, lam tang tdc qua trinh
Bang 2. Anh hudng cua nano kem oxit ddn ddng thai tSng tnrdng kich thirdc q u i cam S^nh DV:cm
C T l (DC) CT2 C T 3 CT4 CT5
DK CC DK CC DK CC DK CC DK CC
Ngay theo doi 20/4
0,71 0,68 0,72 0,73 0,75 0,76 0,77 0,78 0,72 0,74
9/5 1,23 0,96 1,23 1,21 1,26 1,28 1,29 1,21 1,27 1,18
29/5 2,31 1,98 2,43 2,36 2,47 2,41 2,56 2,30 2,44 2,10
17/6 2,67 2,24 2,85 2,53 2,93 2,60 3,28 2,54 2,89 2,38
7/7 3,53 3,41 3,92 3,82 4,33 3,94 4,52 4,13 4,21 4,14
27/7 4,96 4,73 5,31 4,95 5,56 5,05 5,81 5,24 5,42 5,03
26/8 5,82 5,14 6,22 5,76 6,34 5,88 6,86 5,63 6,28 5,53
5/9 6,63 5,80 7,28 6,39 7,58 6,80 8,00 7,12 7,48 6,58
% so vdi DC
109,8 110,2 114,3 117,2 120,6 122,7 112,8 113,4 Ghi chu: DK: Dudng kinh qua, CC: Chieu cao qui
Kh qua trinh bay d bang 2 cho thay, cac cong thiic bdn nano kem oxit deu cd kich thudc qua cao hon doi chiing va co xu hirdng tang theo su tang ciia nong do nano kem oxit, dudng kinh qua tang tir 4,3-20,6%, kich thudc qua tang tir 10,2-22,7% so vdi cdng thtrc ddi chiing, trong do CT4 cho Idch thudc qua cao nhat
3.3. Anh huong cua nano kem oxit d^n mOt sd chi tifiu CO gidi qud cam Sanh
Cac chi tieu hinh thai, co gidi la yeu td quan trong de danh gia man ma va gia tri thuong pham
cua qua cam Sanh. Ket qua nghien ciiu anh huong ciia nano kem oxit den mgt sd chi tieu co gidi qua cam Sanh duoc hinh bay d bang 3.
Nhan xet dugc nit ra tir bang 3: cac cdng thiic phun nano kem oxit cd anh hudng tich cue ddn cdc chi tieu ca gioi qua cam Sanh. Trong pham vi nong dd tir 50 ppm (CT2) den 200 ppm (CT4) cac chi tieu: c h i k cao qua, dudng kinh qua, ti 1^ phan an dugc tang theo chi^u tang ndng do nano kem oxit. ti-ong Iuc chi tieu sd hat/qua giam xudng, trong do CT4 cho k^t qua tdt nhat, cao hon cd y nghia so vdi cong thiic ddi
NONG NGHIEP VA PHAT TRIEN NONG THON - KY 2 - THANG 9/2020
KHOA HOC C 6 N G N G H E
chiing (chifa cao qua tSng 22,7%, dudng kinh qua tang 20,6%, ti le phan an duoc tang 8,9%, sd hat/qua giam 13,2%).
Bang 3. Anh hudng ciia cdng thuc phan bdn d ^ mdt sd chi tiftu CO gidi qua cam Stoh cang
thiic CTl (DC) CT2 CT3 CT4 CT5 LSD„„s
CV%
Chieu cao qua
(cm) 5,80' 6,39*
6,80- 7,12' e.as"*
0,82 6,91
Dudng kinh
qua (cm) 6,63' 7,28"
7,58"
8,00"
7,48"
0,80 6,04
Sd hat/
qua (hat) 20,24"
19,38-' 18,55' 17,56' 18,13' 1,92 5,55
Tyle phan an duoc (%)
78,48' 80,82'=
83,18"' 85,43"
83,70"
2,76 1,85 3.4. Anh hudng cua nano kem oxit d^n nang sudt va cac y^u td cau thanh nang sudt cam Sanh
Bang 4. Anh huong ciia nano kem oxit d^n cic y ^ to cdu ttielnh nang sudt cay cam Sanh Cong
thiic CTl (DC) CT2 CT3 CT4 CT5 LSD,„,s
CV%
Sd qua/cay
(qua) 325,4' 351,6' 373,r 433,2"
395,2' 3,35 0,49
Khdi lugng qua (g) 208,3' 217,2' 226,2"
230,3"
228,1"
4,21 1,04
Nani Nang suat qua (kg/cay) 67,8' 76,4' 84,4' 99,7"
90,1' 3,89 2,55
^suat Tyle so
vol ddi chiing (%)
100,0 112,7 124,5 147,0 132,9
Ghi chii: Cic gia tii cd chu sd di kem khac nhau bieu till sukhac nhau cd y nghia a muc xac suit 95%.
Nang suat la yeu td rat quan trgng ma ngudi san xuat quan tam trong qua trinh trong trot. Nang suat cam dugc cau thanh bdi cac yeu td chii y^u nhu: sd qua tren cay va khoi lugng qua.
Anh hudng cua nano kem oxit den chat lupng qua cam Sanh h-dng tai Ham Yen dugc the hien d bang 4.
Ket qua d bang 4 cho thay cac cong thuc phun nano oxit kem (CT2-CT5) deu cho cac yeu td can thanh nang suat va nang suat qua cao hon cong thiic doi chiing d miic cd y nghia thdng ke vdi do tin cay 95%, ti-ong dd CT4 (phun 200 ppm ZnO/vu) dem lai ket qua tdt nhat (nang suat tang hon ddi chung 32,9%).
Dieu nay chiing td CT4 da cung cap nguyen to vi lugng kem cho cay cam Sanh Ham Yen mot each can doi, phii hgp, giup cay cam Sanh phat trien tdt cho nang suat cao.
3.5. Anh hudng a i a nano oxit kem d^n kha nang chdng chiu sau benh hai cam Sanh
Sau benh luu la mot trong nhtrng nguyen nhan lam giam dang ke nang suat, pham chat va chu ky kinh doanh ciia cam. Ngoai cac yeu td nhu gidng, miia vu thi tan suat va miic do gay hai cua sau benh phu thupc rat Idn vao ky thuat cham sdc cay trdng.
Bang 5. Anh hudng ciia nano exit kem ddn miic dO nhi^m sau benh hai cay cam Satih Cong
thiic CTl (DC) CT3 CT4 CT5
Sau hai (cap) Rep mupi
Nhen do
Benh hai (cap) Benh kho ddu c^nh
Benh chay gom 1
Benh loet
Ghi chii: Sau hai dugc danh gia theo 5 cip: Cip 0: khdng siu hai: Cap 1: bi hai < 10%: Cip 2: Bi hai tu 10-30%: Cap 3: Bi hai tir 31-50%; Cip 4: Blhai >50%.
Bdnh hai duoc danh gia theo 6 cip: Cip 0: khdng bi benh; Cip 1: didn tich vet benh < 10%; Cip 2: didn tich vet benh tir 11- 25%; Cip 3: didn tich vet benh tu 26 - 50%; Cap 4: didn tich vet benh tii 51- 75%; Cip 5: didn tich vet benh > 75%.
Ket qua theo doi kha nang chdng chiu sau benh hai cay cam Sanh ti-ong d Ham Yen (Bang 5) cho thay, benh kho dau canh, benh loet cay xuat hien d toan bo cac cong thiic nhimg vdi miic dp khac nhau, cac cdng thiic cd phun nano oxit kem muc do gay hai nam d cap 1 (miic nhe), con cong thiic doi chiing (CTl) d cap 2 (mirc tiimg binh). Rieng benh chay gdm cac cong thtrc tiii nghiem deu d cap 1. Cac cong thiic phun nano oxit kem vdi nong dp cao (CT3 den CT5) bi nhiem sau ve biia, rep mupi, nhen do d cap 1 thap hon cong thiic ddi chung (d cap 2). Khi phun nano kem oxit vdi nong do thap (CT2) cay cam hi sau ve bua va nhen do nang hon cong thiic ddi chiing. Nguyen nhan cd the do nano oxit kem cd hoat tinh khang khuan, thiic day su phat trien he thdng mien dich cay trong giiip cay trong chdng lai
^ c benh hai. Cac ion Zn-* tao ra tir vat Ueu da pha
155
KHOA HQC C d N G NGHfi
huy mang te bao cua vi sinh vat, ngoai ra cac phan tu hydrogen peroxide (H2O2) sinh ra tii b^ mat cua ZnO da lie che viec phat trien cua vi sinh vat. Khi tang nong dp nano kem oxit da lam tang kha nang khdng benh ciia cay frong [ 10-12].
3.6. Anh hirdng cua nano oxit kem d^n chdt IuQ>ng qua cam Sanh
Trong san xuat ndng nghiep ben canh nang suat, chat lupng qua la yeu td quyet dinh den gia tti kinh te ciia san pham. Anh hudng ciia nano kem oxit den chat Iirpng qua cam Sanh trong tai Ham Yen dugc
the hien d bang 6.
Ket qua nghien ciiu (Bang 6) cho thay cac cong thiic phun nano kem oxit cho ham lugng chat khd, vitamin C, ham Iuong dudng tong va do Brix trong qua deu cao hon cdng thiic ddi chung, cdn hdm luong axit hiru co tong sd thap hon so vdi cdng thiic ddi chiing 0 miic dp tin cay 95%. Khi tang ndng do nano kem oxit, chat lupng qua cam dirpc tang len, trong dd CT4 cho chat lugng qua tdt nhat d muc dO tin cay 9596; qua nggt hon va giau vitamin C, khoang chat hon.
Cdng thiic CTl (DC)
CT2 CT3 CT4 CT5 LSD„„5
CV%
B ^ g 6 . A n h Chat kho
(%)
10,54' 11,28' 11,72"
11,95"
12,21"
0,62 2,97
huong ciia nano oxit Axit tong sd
(%)
0,92' 0,87"
0,75' 0,69''
0,60' 0,09 6,56
kem d^n ch^t luong qua cam S^nh Vitamin C
(mg/100 g) 31,22' 31,85' 32,51' 33,97"
34,12"
0,25 0,42
Duong tong sd
(%)
10,65' 11,43' 11,86' 12,78"
12,23' 0,36 1,70
Brix
(%)
10,82"
11,20'' 11,36"' 11,74"
11,54' 0,38 1,86 Ghi chu: Cac 0a tii cd chu sddi kem khic nhau blSu thi sukhic nhau coy nghia dmiic xac suit 95%.
4.KETLUANVAKiBUniGHI 4.1.K^tIu9n
Phun nano oxit kem co tac ddng tich cue den sinh trudng va phat tiien cua cay cam Sanh, qua do lam tang nang suat cao, chat lupng va kha nang chdng chiu mpt sd loai sau benh hai quan trpng tren cay cd mui.
Trong di^u kien sinh thai vimg Ham Yen, Tuyen Quang, tren cay cam Sanh 8 tudi, phun nano oxit kem ndng do 200 ppm ZnO/vu dugc coi la phii hop nhat, cay cho nang suat cao nhat (99,7 kg/cay/vu) va chat lugng qua tdt nhdt.
4.2. Ki^n nghi
Tiep tuc thu nghiem phan bon nano oxit kem che tao dugc d cac vu tiep theo, tren cac cay trong khac de co the ling dung dai tra trong san xudt nong nghiep 0 Tuyen Quang ndi rieng va Viet Nam ndi chung.
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Cac tac gii xin chin thanh cam on Bd Giio due va Dao tao da hd ti-g- kinh phi cho nghien cuu niy thdng qua de tai cap Bd Ma sd B201S-TNA-60.
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EFFECTS OF NANO ZINC OXIDE FOLIAR FERTILIZER TO GROWTH, DEVELOPMENT, YIELD AND QUALITY OF KING ORANGE GROWN IN HAM YEN, TUYEN QUANG
Dang Thi Hong Phuong'' ^Tran Quoc Toan', Ha Xuan Linh'
^ Thai Nguyen University of Agriculture and Foresty- TNU
^Vietnam -Russian Tropical Center
•'Thai Nguyen University of Education • TNU
^International School, Thai Nguyen University Summary
As an important microelement in the life of cropping plan, zinc has been largely used in various crop over the world in which the spray of zinc nano oxide through leaves was paid great attention because of its simple and effective application. This study auned to detennuie the effechvenss of nano zinc oxide ferUhzer to growth, development, yield and quality of "Sanh orange" cuUivar was implemented in Ham Yen district, Tuyen Quang province in 2019. Results conducted from the study shown diat nano ZnO sprayed at different concentrations gave good unpact to die growth, yield and fruit quality of 8 years old tree of "Sanh orange"
cultivar in which Uie best one was obtained at spraying of 200 ppm ZnO/crop, presented by healthy growth, high yield (132.9% compared to the conUol-no application) and slightly improved quatily.
Keywords: Fertilizer nano, ZnO, king orange, Tuyen Quang, growth, yieid, quahty.
NguM ph4n bi$n: GS.TS. Vu Manh Hai Ngiy n h ^ bii: 27/3/2020 Ngiy thang qua phan bi$n: 28/4/2020 Ngiy duy^t dang: 5/5/2020