252

BN PHN CHO CY N QU

Nguyn Bo V1

ng bng sng Cu Long (BSCL) thuc vng kh hu

nhit i gi ma, nhit trung bnh 270C vi tng nhit c

nm khong 10.0000C, cng vi cc yu t kh hu khc nh nh

nng, gi, m khng kh, bc x mt tri,... mang tnh n nh

nn rt thun li cho sn xut cy n qu nhit i nh su ring,

chm chm, mng ct, xoi, v sa, thanh long, kh, nhn, bi,

cam, qut, chanh, du, bn bon, khm,... BSCL l vng t thp,

hng nm c ma nc ni, b ng ngp vo ma ma, do vy

mun trng cy n qu phi o mng ln lip. o mng l

thot nc trong ma ma v dn nc ti vo ma kh, cn ln

lip l nng cao tng t mt v lm dy tng canh tc (Hnh 1).

Khi ln lip, tng t phn su c a ln lm lip, cng vi

iu kin kh hu nng m, ma nhiu ca vng nhit i v mt

t lip cao lm cho t trng cy n qu BSCL c nhng

biu hin sau:

Hnh 1. Lip v mng vn cy n qu BSCL: (a) Lip trng

cam, chui v (b) Lip trng khm

- Dng cht b trc di: a hnh cao ca t lip lm cho dng cht theo nc trc di xung su i ra mng vn. Do ,

t vn lu nm c pH thp, cc nguyn t kim v kim th nh

1 Nguyn Trng khoa Nng nghip, i hc Cn Th

Lip Lip Mng Mng

253

Ca, Mg, K t i lm gim bo ha base. Mt s dng cht vi

lng nh Zn, Mn nm trong ngng thiu cung cp cho cy trng.

- Cht hu c trong t gim: Nhit , m cao v khng b ngp ng l iu kin tt cho vi sinh vt phn hy nhanh cht

hu c ca t lip. Bn cnh ngun b sung cht hu c li b

hn ch do xc b thc vt c trn mt lip d b ra tri xung

mng vn. Hai yu t ny lm cn kit dn cht hu c, lm

ngho N cho t lip.

- Lp t mt b ra tri: Lp t mt lip l lp t tt ca lip vn cha nhiu cht hu c v dng cht, a s chiu rng

ca lip thng ch vo khong t 4-8 m nn khi ma dm hoc

ti nhiu, nc chy trn lm tri lp t mt xung mng vn,

lu dn lip vn cng ngy cng thp v t tr nn km mu m.

- t b nn d. Lng ma nhiu hng nm kt hp vi lng nc ti d tha trong ma nng lm t lip mau b nn

d, c thm rt km nn cn tr nc ti thm vo t, ng

thi lm r thiu khng kh v hn ch s pht trin.

- Trng cy thm canh: Sn xut cy n qu hin nay hu ht cc nh vn l sn xut hng ha, sn phm c cht lng v

nng sut cao nn lng dng cht c hu ca t lip khng

p ng cho yu cu thm canh.

Do , bn phn cho vn cy n qu BSCL nhm vo

vic khc phc nhng yu t bt li trn ca t lip v p ng

cho yu cu sn xut tri cy hng ha, c cht lng v nng sut

cao.

1. Bn vi cho cy n qu

t vn canh tc BSCL phn ln u b chua, can-xi,

ma-gi v ln hu dng thp, hm lng st v nhm t do li cao

(Khoi v Tri, 2003; V Th Gng v ctv., 2004) bi v hu ht t

BSCL u c tng phn hay tng sinh phn nm di su, nn

khi o mng ln lip, nh vn a tng ny ln lm t canh

tc. Ngoi ra, a hnh cao ca t lip lm cho dng cht theo

nc trc di xung su, nht l cc nguyn t nh Ca, Mg, K nn

lm gim bo ha base, chnh v vy t lip vn cy n qu

BSCL u b chua (Nguyn Bo V v L Thanh Phong, 2011).

254

t chua, khong st trong t b ph hy, mt dn cu trc, tr

nn ri rc, mm nho khi gp nc v kt dnh ng vng khi kh,

t tr nn b cht, km thng thong. Nu tnh trng suy thoi

ko di, t tr bc mu, sc sn xut km, nng sut v cht lng

ca cy trng gim. Bn vi l mt trong nhng bin php hu hiu

ngn chn tin trnh suy thoi ny, gim ng c st, nhm v

mngan cho cy trng, phc hi cu trc t lm t thng thong,

thm nc tt.

Bn vi trn t lip cn cung cp can-xi cho cy n qu.

Can-xi l mt dng cht trung lng nn cy trng cn nhiu can-

xi lm vng chc vch t bo. Khi thiu can-xi cy yu t d

ng, d b su bnh tn cng, tri hay b nt; khi thiu trm trng

t l non bin dng, qun queo ri cht kh. Ngoi ra, can-xi cn

gip cy trng gii c, tng kh nng chng chu vi iu kin bt

li ca nng nng, mn v phn (Nguyn Bo V v Nguyn Huy

Ti, 2010). Can-xi c cy hp th qua tin trnh ht nc, ng

thi can-xi khng chuyn v trong cy nn cy cn hp thu can-xi

trong sut qu trnh sinh trng. Ngoi tc dng ci to t v cung

cp can-xi cho cy, vi cn kh c tc hi ca mn, c ch s

pht trin ca nm bnh trong t v pht huy hiu lc ca phn

hu c, phn v c v thuc dit c.

Liu lng vi bn cho cy n qu nhiu t ty thuc vo

chua ca t v tui ca lip, t chua nhiu v lu nm bn nhiu

hn. Trung bnh hng nm nn bn 500 kg/ha vi cho t lip trng

nhn vng t ph sa gn sng (Nguyn Bo V, 2012) hoc 2 nm

bn mt ln cho t lip trng qut ng vi liu lng 1 tn/ha

trn vng t phn xa sng (Trn Hunh Nguyn Huy, 2011; Chu

Kim Thoa, 2012) cho thy cy pht trin tt hn. Vi c bn vo

u ma ma, bng cch ri u trn mt lip, xi nh cho vi trn

u vo lp t mt. Cn hiu r tc dng ca tng dng vi trc

khi s dng: (a) Bt vi (CaCO3): c lm ra bng cch nghin

mn vi; Loi ny tc dng chm, thng t 2-6 thng sau khi

bn ty theo mn ca bt ; (b) Vi nung (CaO): c to ra

bng cch nung vi trong l nung nh lm gch nhit

khong 900-1.0000C; Loi ny tc dng mnh v nhanh nht nhng

d gy bng khi gp nc; (c) Vi ti (Ca(OH)2): c to ra bng

cch ti ln vi nung mt lng nc gn bng khi lng ca n,

255

lc vi t ra thnh bt, sinh nhit (khong 1500C) v bc hi;

Dng vi ny tc dng kh nhanh.

2. Bn phn hu c cho cy n qu

Nghin cu ca V Th Gng v ctv. (2004) trn nhiu

vn trng cy cam qut c tui lip khc nhau cho thy cc lip

vn trn 20 nm tui c pH t thp, hm lng cht hu c rt

thp, N tng s ngho, N hu c d phn hy, N hu dng, cation

trao i nh Mg, Ca v bo ha base u rt thp so vi cc lip

vn 7 nm tui. Mt s nm v vi khun gim thp trong cc lip

vn 20 nm tui cng cho thy hm lng cht hu c trong t

b suy gim. S ngho kit cht hu c trong t s lm cho s sinh

trng v pht trin ca cy trng b gii hn, iu ny dn n

nng sut km.

Cht mn hu c trong t nh hng n s sinh trng v

nng sut ca cy trng thng qua cc c tnh l, ha v sinh ca

t nh: (a) Cung cp m, ln, lu hunh v cc vi lng mt

cch t t cho cy; (b) Tch tr dng cht t phn ha hc. Vai tr

ny rt quan trng, gip hn ch vic mt phn sau khi bn v nu

khng chng b bc hi hoc ra tri. Nhng cht dinh dng c

gi li sau c phng thch cho cy hp th khi cn thit; (c)

Ci thin cu trc ca t, lm t c nhiu l rng hn v th t

tr nn thng thong, gip s di chuyn ca nc trong t d dng,

gi c nhiu nc hn; (d) Lm tng mt vi sinh vt trong t,

bao gm c vi sinh vt c li. Ngoi ra, mn cn c vai tr kch

thch cho cy trng pht trin. c tnh ny l do s hin din ca

nhng cht c chc nng nh cht iu ha sinh trng thc vt c

trong mn hu c, c hot tnh tng t nh IAA, gibberillin,

cytokinin, hoc l nhng cht ngn cn s phn hy auxin.

BSCL c nhiu ngun cung cp phn hu c m b con

nng dn c th s dng d dng nh: rm r (trn 25 triu

tn/nm), b bn v b ma (trn 120 ngn tn b bn v trn 1,2

triu tn b ma/nm), phn chung,... Phn hu c c bn vo

u ma nng trnh s cnh tranh oxy gia vi sinh vt phn hy

hu c v r cy n qu. Liu lng phn hu c bn cho cy n

qu ty thuc vo loi phn, loi cy v c tnh ca t, thng

thng nn bn t 10-20 tn. Trc khi bn, dng cuc rng xi

256

nh mt lip gi phn hu c (nu t lip khng c c). Nn

bn phn hu c bn phn hy c ti thm nm Trichoderma

c ch s pht trin ca nm bnh trong t. H Vn Thit (2006)

nhn thy bn phn hu c c tc dng tch cc v mt sinh trng

ca cy trng, t l pht trin ca r rt nhanh, r nht l vn

chm chm (tnh Bn Tre) khi bn phn hu c cn b sung nm

Trichoderma. Ngoi ra, vic bn phn hu c c b sung nm

Trichoderma gip vn su ring gim t l bnh Phythopthora rt

tt, khc bit ngha so vi i chng, nng sut qu su ring gia

tng v cht lng qu c ci thin. Kt qu th nghim ca Lm

Phc Hi (2012) trn qut ng tnh Hu Giang cho thy

nghim thc c bn b bn+b ma (t l 3:1) kt hp vi nm

Trichoderma mang li hiu qu kinh t cao hn so vi i chng

khng bn. Mc d nghim thc i chng khng phi tn chi

ph mua b bn, b ma, nm Trichoderma, cng vn chuyn v

cng bn nhng c li nhun thp hn nghim thc c bn 30

tn/ha b bn+b ma l 67.180 ng/cy. Th nghim ny c

tip tc theo di qua nm th hai nh gi nh hng lu tn

ca b bn+b ma, v kt qu cho thy b bn+b ma vn cn tc

dng tt trn cy qut ng n nm th hai (o Th Hng

Giang, 2012).

3. Bn bn mng cho cy n qu

V mt dinh dng m ni th li th trong canh tc cy n

qu trn t lip BSCL l mng vn c cha mt lng bn

rt ng k. Bn y mng cha nhiu xc b hu c v ph sa c

nhiu dng cht c th s dng bn cho t lip. Xc b thc

vt l cnh l ca cy tri v c di trn lip ra tri xung mng

do ma hay ti nc. Cn ph sa t sng rch theo nc ti i

vo mng vn; Hm lng dng cht c trong ph sa kh nhiu

nh: 0,1% N; 0,1% P2O5; 3,9% K2O; 0,57% CaO; 1, 72% MgO;

63,5% SiO2, 13,53% Al2O3; 5,64% Fe2O3; 0,09% MnO. Lng ph

sa c nhiu nht l vo u ma nc ni. ph sa vo mng

vn c nhiu phi thit k vn c 2 cng bng t 2 u

vn, mt t u ngun nc ly nc vo v mt cui

ngun thot nc ra.

Bn bn y mng cho lip cy n qu c thc hin

trong ma nng, mt n 2 nm/ln ty thuc vo lng bn c

257

y mng. Sau khi rt nc cn mng vn, bn y mng

c a ln lip bng gu hay my bm bn lm thnh mt lp

mng khong 2-3 phn u trn mt lip (Hnh 2). Khng bi qu

dy hay bi trong ma ma d lm cho t thiu oxy. Ch ly phn

t bn nho y mng a ln lip m thi, khng chm n

tng t cng y mng, v thng tng t ny c cha vt liu

sinh phn, khi a lp t ny ln lip gp khng kh s oxy ha

thnh phn hot ng hi r.

Hnh 2. S dng bn y mng bn cho lip vn cy n qu: (a)

Dng gu a bn y mng ln lip v (b) Mt lip sau khi bn

bn y mng

4. Bn phn ha hc cho cy n qu

Trong iu kin trng cy thm canh, c nng sut v

cht lng cao, cy n qu cn phi c bn phn ha hc mi

p ng nhu cu dinh dng cho cy. Bn phn ha hc cho cy

n qu ty thuc vo cc yu t sau y:

- Loi cy v tui cy: Khi cy bt u c qu, lng phn bn tng dn khong 5-10%/nm n khi cy cho qu n nh.

- Ty thuc vo nng sut v trc: Trng ma bn phn nhiu hn bnh thng

- Loi t: t phn cn c cung cp nhiu hn P, Ca. Mg, nhng khng cn bn thm lu hunh; t mn cn bn nhiu hn

K, N, Ca; t nhiu ct cn bn nhiu K, Ca, Mg; t ph sa c

cn b sung tt c cc cht dinh dng; t nhiu hu c cn bn

nhiu Cu, Zn.

258

- Theo giai on sinh trng ca cy: (a) Sau khi thu hoch qu; (b) trc khi ra hoa; (c) sau khi u qu v qu pht trin.

4.1. Bn phn ha hc cho cy cn t

Cy t cn c bn phn thng xuyn ra t non lin

tc, to khung tn ln, mau thun thc, cho qu sm. Mi nm c

th bn t 4-6 ln phn. Dng cht N, P, v K c bn theo t l

3:2:1 bng cch trn 3 phn ur + 3 phn DAP + 1 phn KCl, hoc

s dng phn u Tru TE+Agrotain hay NPK u Tru 20-20-

15+TE vi liu lng t 50-200 g/cy/ln bn ty theo loi cy v

tui cy.

4.2. Bn phn ha hc cho cy trng thnh

* Bn phn ha hc giai on sau khi thu hoch qu.

Bn phn giai on ny l cy phc sc, nui cnh l

mi chun b cho v tip theo. Ngay sau khi thu hoch, cn ct ta

kch thch cy ra chi mi mp, khe, tp trung, tn cy thng

thong nhn y nh sng v gi, cy t su bnh. Do , sau mi

k thu hoch qu gip cy ra t mi chun b cho v sau, cn

phi ct ta nhng cnh ra qu, cnh khng ra hoa v trc, cnh

m yu, cnh vt trong tn, cnh b su bnh. ng thi ta cnh

kt hp vi sa tn khi cnh qu di v tn cy qu ln. Khong vi

nm nn ct sa tn mt ln, ct b ti a 25% s cnh trong tn.

Dng ko ct ta nhng cnh nh, dng ca ct nhng cnh ln.

Sau khi ct ta, xi t thnh bng xung quanh gc theo hnh

chiu ca tn, rng khong 50 cm v su khong 10 cm. Nu lip

trng hai hng cy v cy gip tn th xi mt bng di ngay

gia lip v nhng bng xng c gia 2 cy trn hng. Tin hnh

bn phn vo nhng bng xi. Ba dng cht a lng N, P v

K bn cho cy giai on ny c t l N cao nht (2:1,5:1) bng cch

trn 2 phn ur + 2 phn DAP + 1 phn KCl, hoc bn phn u

Tru AT1 vi liu lng t 2-3 kg/cy ty theo tui v loi cy.

Sau khi bn phn phi ti nc thng xuyn cy ra t non.

* Bn phn ha hc giai on trc khi ra hoa

Khong 1-2 thng trc khi cy ra hoa tin hnh bn phn

ln th 2, nhm mc ch nhng l ang pht trin mau trng

thnh, khng cho chi mi mc gy cnh tranh dinh dng v cng

259

kch thch s phn ha mm hoa. Dng cht N, P v K bn cho

cy giai on ny c t l P cao nht (c t l 1:3:2) bng cch trn

2 phn DAP + 1 phn KCl; hoc bn phn u Tru AT2 vi

liu lng t 1-2 kg/cy ty theo tui v loi cy. Sau khi bn phn

phi ti m kch thch cho cy phn ha mm hoa.

* Bn phn ha hc giai on u qu v qu pht trin

Bn phn giai on u qu l nhm hn ch rng qu non,

cn bn phn lc qu pht trin l gia tng kch thc v cht

lng qu, v y l giai on qu tch ly cht dinh dng. Dng

cht N, P v K bn cho cy giai on ny c t l K cao nht (t

l 1:1:1,5) bng cch trn 1 phn ur + 2 phn DAP + 2 phn KCl,

hoc bn phn u Tru AT3 vi liu lng t 2-3 kg/cy. Kali

l cht ca cht lng, bn nhiu kali l tng cng s chuyn

vn sn phm quang hp t l vo qu.

5. Bn phn cho mt s loi cy n qu BSCL

5.1. Bn phn cho cy c mi

* Giai on cy cn t. Liu lng phn bn cho cy c mi cn t

c trnh by trong Bng 1. Phn NPK u Tru 20-20-15+TE

c chia u ra lm 4 ln bn, bn theo hnh chiu ca tn cy.

Phn hu c bn mt ln vo u ma ma, bn theo mp ngoi

ca m cng lc vi bi m. Phn vi nung c bn mt ln

vo u ma ma, phn c ri u trn lp.

Bng 1. Liu lng phn bn cho cy c mi cn t hng nm

Tui cy u Tru 20-20-

15+TE

(g/cy/nm)

Hu c

(kg/cy/nm)

Vi

(g/cy/nm)

Nm th nht 200-300 10-20 200-300

Nm th hai 400-500 10-20 200-300

Nm th ba 600-700 10-20 200-300

Nm th t 800-1000 10-20 200-300

* Giai on cy cho qu. Liu lng phn bn cho cy c mi giai

on cy cho qu c nng sut khong 40 kg/cy/nm c trnh

by trong Bng 2. Khi nng sut qu gia tng 1 kg/cy/nm th

260

lng phn u Tru phi bn tng thm 1%. Phn hu c v phn

vi khng thay i.

Bng 2. Liu lng (kg/cy) v thi k bn phn cho cy c mi c

nng sut 40 kg/cy/nm

Thi im bn u Tru

AT1

u Tru

AT2

u Tru

AT3

m Ht

Vng u

Tru

46A+

Phn

hu c

Phn

vi

Sau khi thu hoch

v ta cnh 1,00 - - 0,25 - -

Trc khi ti

nc x l ra hoa - 1,00 - - - -

Sau khi ra hoa 1

thng - - 0,5 - - -

Sau khi ra hoa 3-4

thng - - 0,5 - - -

Sau khi ra hoa 5-6

thng - - 0,5 - - -

u ma kh - - - - 20 -

u ma ma - - - - - 0,3

5.2. Bn phn cho cy xoi

Phn bn l yu t quan trng nh hng n vic cho qu

cch nm ca xoi. Sau nm t nng sut cao (nm trng), nu

thiu phn bn v ti nc trong ma kh, xoi s ra hoa t v

rng nhiu vo nm sau (nm tht ma). Lng phn bn ty theo

tui cy, t ai v tnh trng sinh trng ca cy. Thng thng

c th bn phn nh sau:

* Thi k cy t (3 nm u). Liu lng phn bn cho cy xoi

cn t c trnh by trong Bng 3. Phn u Tru TE +

Agrotain c chia u ra lm 4 ln bn, bn theo hnh chiu ca

tn cy. Phn hu c bn mt ln vo u ma ma v bn mp

ngoi ca m cng vi thi im lc vi bi m. Phn vi nung

c bn mt ln vo u ma ma, phn c ri u ln lip.

261

Bng 3. Liu lng phn bn cho cy xoi cn t hng nm

Tui cy u Tru TE + Agrotain

(g/cy/nm)

Hu c

(kg/cy/nm)

Vi

(g/cy/nm)

Nm th nht 300-400 20-30 200-300

Nm th hai 500-600 20-30 200-300

Nm th ba 700-800 20-30 200-300

* Thi k cy cho qu. Cy 6-8 nm tui cn nhiu phn c

sn lng cao, trung bnh bn theo cng thc 1,09- 0,90-0,96 (kg N-

P-K/cy/nm) nh Bng 4 (Nguyn Bo V v Nguyn Hng Ph,

2004). Liu lng ny thay i ty theo tui cy v mu m ca

t.

Bng 4. Liu lng (kg/cy) v thi k bn phn cho cy xoi t 6-

8 nm tui

Thi im bn u Tru

AT1

u Tru

AT2

u Tru

AT3

Phn hu

c

Phn vi

Sau khi thu hoch

v ta cnh 3,00 - - - -

Trc khi x l ra

hoa 1 thng - 2,00 - - -

Sau khi u qu

na thng - - 3,0 - -

u ma kh - - - 30-40 -

u ma ma - - - - 0,3

5.3. Bn phn cho cy nhn

* Thi k cy t (3 nm u). Liu lng phn bn cho cy nhn

cn t cha cho qu c trnh by trong Bng 5. Phn NPK u

Tru 20-20-15 + TE c chia u ra lm 4 ln bn. Xi t xung

quanh m t hnh chiu ca tn cy bn phn, sau lp t v

ti nc cho phn tan, nhng khng ti d tha lm nc

chy trn mt phn. Phn hu c bn mt ln vo u ma ma,

bn mp ngoi ca m cng lc vi bi m. Phn vi nung c

bn mt ln vo u ma ma v c ri u ln lip.

262

Bng 5. Liu lng phn bn cho cy xoi cn t hng nm

Tui cy NPK u Tru 20-20-15 + TE

(g/cy/nm)

Hu c

(kg/cy/nm)

Vi

(g/cy/nm)

Nm th nht 400-600 10-15 200-300

Nm th hai 800-1.000 10-15 200-300

Nm th ba 1.200-1.400 10-15 200-300

* Thi k cy cho qu. Loi phn, liu lng v thi k bn phn

trnh by trong Bng 6 di y p dng cho cy nhn 7 nm tui.

Cy nh tui hn th bn t hn, v tt nhin cy ln hn phi bn

nhiu hn. C mi nm tui nh hn hay ln hn m lng phn

ny gim hay tng 10%. Tuy nhin, lng phn bn ti a l cy

10 nm tui, sau khng tng thm na.

Bng 6. Liu lng (kg/cy) v thi k bn phn cho nhn t 7

nm tui

Thi im bn u Tru

AT1

u Tru

AT2

u Tru 13-

13-13 + TE

u Tru

AT3

Phn

hu c

Vi

Sau khi ct ta

cnh nhn 0,5 - - - - -

Sau khi ci t

mt gi 0,5 - - - - -

Hai tun trc x

l ra hoa nhn - 0,5 - - - -

Pht hoa nhn di

5 cm - - 1,0 - - -

Hai tun sau khi

nhn u qu - - 1,0 - - -

Khi ht nhn c

mu en - - - 1,5 - -

u ma kh - - - - 15-20 -

u ma ma - - - - - 0,3

5.4. Bn phn cho cy khm (nhm Queen)

Bn phn cho khm cn tun th nguyn tc sau (L Thanh

Phong v ctv., 2002):

- Bn nhiu ln thng xuyn tha mn nhu cu ca cy: V t bn 4 ln/v, cn v gc bn 3 ln/v.

263

- Bn cn i cc cht dinh dng qu c phm cht tt v t nng sut cao: Bn ng b m, ln, kali v can-xi.

- Bn lng dng cht, nht l trn t ngho dinh dng: BSCL bn 8 g N + 6 g P2O5 + 12 g K2O + 3 g CaO/cy/v.

- p dng k thut bn thch hp: Sau khi bn phn nn ti nc va lm tan phn, khng ti nc d tha lm tri

phn.

Nn bn phn cho khm v t v v gc theo Bng 7 sau y.

Bng 7. Thi k v liu lng (kg/ha) bn phn cho khm v t v

v gc (mt 50.000 cy/ha)

Thi im bn u Tru

AT1

u Tru

AT2

u Tru

AT3 KCl

vi

nung

V t:

Lt trc khi trng 200-300 - - 25-50 200-300

2-3 thng sau khi trng 300-400 - - 50-75 -

4-6 thng sau khi trng 400-500 - - 75-100 -

Trc x l ra hoa 1-2

thng - 500-600 - 25-50 -

Sau khi x l ra hoa 2-3

thng - - 500-600 75-100 -

V gc:

Ngay sau khi thu hoch 400-500 - - 75-100 -

Sau thu hoch 2-3 thng 400-500 - - 75-100 -

Trc x l ra hoa 1-2

thng - 600-700 - 25-50 -

Sau khi x l ra hoa 2-3

thng - - 600-700 75-100 -

TI LIU THAM KHO

1. Bui Xuan Khoi and Mai Van Tri, 2003. Fertilizer Recommendations for Sustainable Production of Orchard Fruit

in the South of Vietnam. Southern Fruit Research Institute.

Vietnam.

264

2. Chu Kim Thoa, 2012. nh hng ca liu lng bn vi n nng sut v phm cht tri qut ng v th hai ti huyn

Phng Hip, tnh Hu Giang. Lun vn tt nghip thc s ngnh

Trng trt. Trng i hc Cn Th.

3. o Th Hng Giang, 2012. nh hng ca b bn v b ma kt hp vi nm Tricoderma n nng sut v phm cht ca

qut ng (Citrus reticulate Blanco) nm th hai trng ti

huyn Phng Hip, tnh Hu Giang. Lun n thc s ngnh

Trng trt. Trng i hc Cn Th.

4. H Vn Thit, 2006. S suy thoi t vn trng su ring, chm chm ti huyn Ch Lch tnh Bn Tre v gii php khc

phc. Lun n thc s ngnh Khoa hc t. Trng i hc

Cn Th.

5. Lm Phc Hi, 2011. nh hng ca b bn v b ma kt hp vi nm Tricoderma n nng sut v phm cht ca qut

ng (Citrus reticulate Blanco) trng ti huyn Phng Hip,

tnh Hu Giang. Lun n thc s ngnh Trng Trt. Trng i

hc Cn Th.

6. L Thanh Phong, Nguyn Bo V v Tng Hu Thun, 2002. nh hng ca bin php bi lip trn nng sut khm Queen

(Ananas comosus (L) Merr.). Tp Ch Khoa Hc i Hc Cn

Th-2002 (Quyn 3). Cn Th. Trang: 146-150.

7. Nguyn Bo V v L Thanh Phong, 2011. Gio trnh cy n tri. Nh xut bn i hc Cn Th. Cn Th.

8. Nguyn Bo V v Nguyn Hng Ph, 2004. Liu lng v thi k bn m, ln v kali cho xoi Chu Hng V huyn

Cng Long, tnh Tr Vinh. Tp Ch Nng nghip & Pht trin

Nng thn 12/2004:1704-1706.

9. Nguyn Bo V v Nguyn Huy Ti, 2010. Dinh dng khong cy trng. Nh xut bn Nng nghip. TP. H Ch

Minh.

10. Nguyn Bo V, 2012. Xy dng quy trnh canh tc nhn Edor v nhn Xung Cm Vng ti huyn Chu Thnh, tnh ng

Thp. Bo co tng kt ti nghin cu khoa hc. S Khoa

hc v Cng ngh tnh ng Thp.

265

11. Trn Hunh Nguyn Huy, 2011. nh hng ca phn bn can-xi n nng sut v phm cht ca cy qut ng trng

huyn Phng Hip, tnh Hu Giang, Lun vn tt nghip k s

Trng trt. Trng i hc Cn Th.

12. V Th Gng, Dng Minh, Trn Kim Tnh v Nguyn Khi Ngha, 2004. Nghin cu s suy thoi ha hc v vt liu t

vn trng cam qut BSCL. Bo co tng kt ti nghin

cu khoa hc. Trng i hc Cn Th.