SU BIEM DQIVG

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KHOA HOC CONG N G H i

IMGHIEIXI CLTU S U B I E M DQIVG CIJA IMAIMG S U A T V A PHAIVI C H A T GIOIMG K H O A I LAIMG

T A I HUYEIM BilMH TAIM, TflMH VilMH LOIMG

Nguyen T ^ Lang^, Ld TTii Tnic PhuongS Nguydn Trpng Phudc' T X ^ M T A T

Khoai lang (Ipomoeaebatatas (L.) Lam. la loai cay thuc pham quan trong cho con ngudi, thuOc ho Convolvulaceae. Gidng khoai lang tim Nhatva gidng Hung Loc duoc xem nhu la mot loai cay trong chinh ciia huyen Binh Tan, tinh Vinh Long. Thi nghiem tai 5 xa (Thanh Trung 1, Tan Thanh, Thanh D6ng, Thanh Trung 2, Tan Binh) ghi nhiin giong khoai Hung Loc c6 nang suat vuot troi dat 35,42 tan/ha, k^

den la gidng khoai tim Nhat da phuc trang dat 24,34 tan/ha. Khoai lang la mot ngudn cung cap vitamin A rat quan trong, ben canh do ham luong vitamin C trong khoai lang cung rat dang chii y. Khoai lang cdn chiia cac loai vitamin E, BI, B2 va axit folic, rat giau khoang chat bd sung chiic nang cua co th^ nhu kem va canxi. Trong cac gidng thi nghiem, giong Hung Loc cd ham luong |J-carotene (47,78 ug/g), vitamin C (27,68%) cao nhat. Trong khi do ti le sit ciia gidng tim Nhat rat cao 0,617 mg/lOOg, cao hon gidng ddi chiing.

Tii khoa: ^-caroteije, khoai lang, vitamm C, vitamin A.

I.GNnTIBJ

Khoai lang (Ipomoeae batatas (L) Lam.; c6 nhidm sdc the (2n = 6 x = 90) Id mdt lodi thuc vdt lau nam dupe trdng nhu mdt edy trdng hang nam. Tliude hp bim bim Convolvulaceae (Martin, 1970; HuaNam, 1992; Reddy etal., 2007; Troung etal., 2011). An ninh luong thuc da trd thdnh mot trong nhiing thach thiic lon ddi vdi su phat trien ciia cdc nude, dac biet Id eho cac nude kem phat trien nhat (FAO, ndm 2011). Trdn the gioi sau lua mi, gao, ngd, khoai tay, lua mach va sdn thi khoai lang la edy trdng quan trpng tiep theo vi cd ndng suat eao, kha nang thich iing rdng (Yan vd ctv., 2014). O tinh Vinh Long, khoai lang dupe hong trdn 14.000 ha tap trung tai huyen Binh Tdn, phu hpp vdi phuang thiic canh tac hdng mau cua huydn, cd kha nang thich iing rdng, nang sudt eao, chu ky phat trien ngdn va cd gid tri dinh duong eao.

Theo nghidn cuu cua Owori va ctv., (2007);

Ahmed et al., (2010), khoai lang chiia nhieu carbohydrates (96%), ddng mot vai hd quan hong trong vide bii ddp su thieu hut nang lupng. Ngoai viec cung cap carbohydrate, khoai lang edn eung cap nguon vitamin A cao hong cu fldn den 4000 U.I./IOO g cu tuoi, tuy thudc vao su da dang ciia cdc gidng khoai). Thdnh phan vitamm C (30 mg/100 g) trong cu cung rat dang chii y (Bell etal., 2000). Khoai lang ciing chiia cac Ioai vitamin E, BI, B2 va axit folic.

Khoai lang rat gidu khodng chat rat can thi^t Ai hoat ddng cua co tiie nhu kdm va canxi (32%). Tuy nhidn, vdi cdc gidng khoai lang dang dupe hdng phd bien tai Vinh Long, thdng tin vd thdnh phan pham chat cu cdn rat ban che. Van de cap bach dat ra Id lam sao chpn gidng khoai lang mdi cd nang suat cao, pham chdt tdt de bd sung vdo bd gidng hidn cd ciia huyen Binh Tdn va md rdng md hinh san xuat hom gidng tai chd phuc vu cho nhu cdu san xuat b dia phuong.

Chinh vi vay de tdi "Xiy dung mang ludi nhan gidng khoai lang d tinh Vinh Lonf da duoc trien khai nhdm chpn Ipc cac gidng khoai lang dat ndng suat cao, pham chat tdt, khdng sdu bdnh, thich nghi voi dieu kidn dia phuong eung cap cho vung chuydn canh, phuc vu gidng khoai lang tai chd cho tinh Vinh Long.

Bai viet nay gidi thieu kdt qua "Nghien cuu su bien ddng cua nang suat va pham chat mot sd gidng khoai lang tai huyen Binh Tan, tmh Vinhlxm^'.

Z. VAT UEU VA PHUDNG PHAP NGHBII Ciiu 2.1. Vdt lidu

Thi nghidm thuc hien vdi hai gidng: khoai lang tim Nhat (ma sd: 001) va gidng khoai Hung Ldc. Su dung gidng khoai lang tim thu trong dan tai huydn Bmh Tdn, tinh Vinh Long lam ddi chiing.

22. Phucmg p h ^ nghidn ciiu 2.2.1. Bd tri thi nghiem

' Vien Nghien ciiu Nong nghiep Cong nghe cao DBSCL

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KHOA HOC C O N G NGHl

Khoai lang trdng thu nghiem dupe bd tri theo khdi ngdu nhidn hoan todn (RCBD) voi 3 ba lan lap lai trong nam 2017-2018. Khoai lang duoc trong theo nhiing Id (200 cay/ld) vdi khoang each hang cdch hang: 10 x 15 cm. Lupng phan bdn cho thi nghidm nhu sau: 117 kg N, 74 kg P^Os va 46 kg K2O eho 1 ha.

Tudi nude cho khoai 3 ngay/lan bdng may bom.

Phan bdn: Bdn Idt todn bp phan huu ca (HC) va phdn lan sau khi lam ddt va trude khi len ludng. Bdn thiic (i) lan 1 d- 5 ngay sau ti-dng (NST) bdn 20% lupng N, (il) lan 2 a 15 -18 NST bdn 40% lupng N vd 30% lupng K2O, (ui) Idn 3 o 38 - 42 NST bdn 20% lumig N va 35%

lupng K2O vd (iv) lan 4 d 58 - 62 NST bdn 20% luong Nva 35% luong K2O.

2.2.2. Danh gia nang suat va pham chat cae gidng khoai lang

* Danh gia ning suit

- Nang suat la tong san lupng cua cii duoc tao thanh ndng sudt cu (bao gdm cd cae cii to va cac cu rat nhd) duoc danh gid theo Jill E. Wilson et al (1989).

*Dinhgiapham chatdinh dudng - Xac dinh cdc ehi tieu: hdm lupng tinh bot, chat khd, protein, carbohydrate, vitamme A, B, mangan.

Xdc dinh ham lupng dudng va tinh bpt ciia cii:

Mlu cu duoe nghidn va ddng lanh trong nito Idng, dong khd va can khdi lupng cua chung. Cac mdu khd dupe ddt hong ethanol 80% (v/v) va tien hanh phan tich ham Iuong duong hda tan vdi thudc thu anthrone. 200 mg mdu khd dupe thdm vao 7 ml ethanol 80% va dupe u hong 10 phiit d nhidt dp SO^C.

Sau do, hdn hpp dupe ly tam 1000 vdng trong 5 phut va chuyen dung dieh ben trdn sang tube mdi. U lai vdi 7 ml ethanol 80%. Ket tiia sau do dupe nia lai bdng 5 ml ethanol ndng 80% va tat ca cdc chat trich xuat vd k^t tiia trdn duoe sii dung d^ phan tich dudng va hnh hot hda tan theo thii tu theo Yoshida et al (1997).

Dudng hda tan dup'c phdn tich bdng each thdm 0,5 ml dich chiet va 5 ml thude thu anthrone. Cac hdn hop phan iing duoe dun sdi nhanh chong trong 10 phiit va dupe cdn bdng d nhiet dp phdng sau khi lam lanh hen da hong 5 phut, hep theo hon vd dpc hdn hpp b bude sdng 620 nm. Ket tiia dupe lam khd vd su dung eho phdn tieh tmh bpt theo phuang phap eua Setter era/., (1989).

- 20 mg tiia khdng tan trong ethanol dupe ddt vdo pyrex va dun sdi hong 3 gid sau dd thdm 2 ml dung dich acetate. Them 2 ml acetate vdi 1 ml amyloglucosidase vdo pyrex va u hong 24 gid d nhidt dp 37°C. Mdu duoe ly tam va dung dich ben hen (san pham thuy phdn) dupe ehuyen vao tube 25 ml, sau dd ket tua dupe nia 2 lan vdi 3 ml nude cat. Dich chiet dupe ket hpp lai vdi nhau vd ldn the tich den 25 ml. Cae mdu dupe phan tich bdng thiet hi do mdu thdng qua quang phd hap thu o buoc sdng 450 nm trong 0,6 ml dung dieh thuy phan va 3 ml glucoseoxidase/peroxidase sau dd ti^p tuc u trong tdi khoang 30 phut.

* Dinh gia phim chat cu khoai lang - Do ngpt cu dupe xdc dinh sau khi nau chin bang phuong phdp cam quan theo thang diem L9, trong dd: 1 = khdng ngpt, 3 = hoi ngpt, 5 = ngpt viia, 7

= ngpt va 9 = rat ngot, vdi nhung con sd d giQa dai didn eho x^p hang trung binh.

- Ket cau ben trong ciia cu mdu nau chin dupe ddnh gid thdng qua thang diem 1-9, hong do: 1 = rat am udt, 3 = am, 5 - viia khd, 7 = khd va 9 = rat khd, vdi nhung con sd d giua dai didn cho x^p hang trung binh.

- Huong vi chung ciia mdu nau chin dupe danh gid bdng thang di^m 1-9, trong do: 1 = xudt sdc, 3 = tdt, 5 = khd, 7 = kem va 9 = rat kem, vdi nhimg eon sd d giira dai dien cho xep hang trung binh.

- Miic hap ddn bdn ngoai eiia mau khoai lang nau chin dupe ddnh gid bdng thang di^m 1-9, trong dd: 1

= rat hap ddn, 3 = hap ddn, 5 = hoi hap ddn, 7 = khdng hap dan, 9 = rat xau, vdi nhung con sd b giO;a dai dien cho xep hang trung binh.

- Phdn tich thanh phan dudng va (S-carotene:

thirc hidn trdn cii dd bao quan tir 4 den 10 tudn sau khi phoi, hong do hdm luong dudng thay ddi den miie thap nhat (Picha, 1987). Ham Iuong dudng dupe phan tich nhu md td cua Picha (1987). Cu ehua gpt vd dupe cdt ldm ddi theo chieu dpc va cdt thdnh mieng nhd ddng nhat trdn todn bd be mat den dp sdu 3 mm. Mdi md cdt cua bdn eu lap lai dupe ket hpp vd 10 g ddng hda voi 80% ethanol trong 1 phut d toe dp cao bdng each sii dung may dong hda aBrinkman (Brinkman Instruments, Westbury, NY). Hdn hop thu dupe ngay lap tiic duoc dun sdi trong 15 phut, lam lanh vd lpe qua giay Whatman # 4. Du lupng va binh ehiia ban ddu dd dupe rua saeh bdng ethanol

NONG NGHIEP VA PHAT TRIEN NONG THON - KY 1 - THANG 6/2019 ⁴⁹

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KHOA HOC C O N G N G H E

va dich Ipc dupe tiiuc hien mdt khdi lupng cudi Cae gidng khoai duoc hdng khao nghiem tai 5 cung cua 100 ml. Dieh Ipc dudng dupe xac dinh bdng diem eua huydn Binh Tdn trong vu hd thu 2018, k^t sac ky Idng cao hieu suat (HPLC) nhu mo ta ciia

Picha (1987).

- Gia tii mau Hunter (Hunter, 1958) dupe danh gia thdng qua do ludng tren thit cua cu dai didn da dupe phoi bi mdi Id bdng each su dung mdt quang phd Mmolta em 3500d (Minolta Co, Osaka, Nhat Ban). He thdng mdu sdc nay dupe danh gid dua hen chi sd L va cac phep do a va b, hong do ti Id va cuong dp la L = sang, a - xanh Id eay - do, b = xanh - vang.

Phuang phdp do ludng mau sdc ndy dupe thuc hidn bdng each su dung mdt sd tupng ti Id hiiu hieu va vd hieu. Ddi vdi cac gia hi mdu sdc, mot gia tri hiiu hidu dupe coi Id mdu do, mpt gid tri vd hidu nhu mau xanh la cay. B gia tri mau sac, mpt gia tri hiiu hieu dupe coi la mdu vdng, mot gia tn vd hidu nhu mau xanh.

Lightness (L) dupe do hen thang diem tir 0-1000 = mau den va 100 = mau hing. Do mau thit cii dupe thuc hidn tai mat cdt ngang cua eau tao bdn hong cu.

- Phdn tich ham luong vi Iuong trong cu khoai lang theo phuong phdp sinh hda eua Yoshida (1997).

Phan tich thdngke: theo chuong trinh STEPDISC (SAS, 2003).

Thiri gian va dia diem nghien cuu: Nghien cuu dupe thuc hien tir 10/ 2017 den 11/2018 tai 5 dia diem thudc huyen Binh Tan, tinh Vinh Long va Vien Nghien cihi Ndng nghidp Cdng nghd cao DBSCL,

3. KET QUA VA TTtAO L U A N

3.1. Cdc y^u td cdu thdnh nang suat va ndng sudt cdc gidng khoai lang thi nghidm trong vu he thu 2018

qua cho thay: su bi^n ddng rat lon v^ nang suat, mac dil thdi gian sinh trudng la khdng khde nhau nhidu (110-130 ngay).

Chi tidu sd eii tren ddy la mdt trong nhung thanh phdn rat quan trong de cd the gia tang nang suat. K^t qua khao nghiem bang 1 cho thay sd cu/day bi^n dong tir 0,9. Nang suat ddi vdi khoai tim Nhat ghi nhdn cd bien dpng 7,8 kg, trong khi gidng khoai Hung Ldc bien dpng cac diem chenh lech 8,3 kg.

Ket qua d bang 1 cho thay, trong vu he thu 2018 tai cac diem thi nghiem gidng khoai lang Hung Ldc cd sd cu Idn/day nhidu nhat, (trung binh la 3,32 cu/day), tiep den la gidng khoai tim Nhat (2,34 cu/day) va thdp nhdt la gidng tim ddi ehiing (1,5 cu/day).

Vd ndng suat thuc thu gidng khoai lang Hung Loc eiing dat Cao lihat (trung binh 35,42 tan/ha), tiep ddn la gidng khoai tim Nhat (24,34 tan/ha) va thap nhat la gidng khoai tim ddi chung (20,32 tan/ha).

Nang sudt cu ihuong pham Id ehi tidu quan trong nhdt quydt dmh thu nhdp ciia ngudi hong khoai. Trong s6 cac diem khao nghiem khoai lang, diem Thdnh Trung 1 cho nang suat cu thuong pham cao nhat. Gidng khoai Hung Loc cung cho kdt qua vuot trdi vd nang sudt eii dat tieu chuan thuong pham (26,1 tdn/ha) va ty Id cii dat chuan thuong pham cung cao nhat (73,68%).

Didu nay chung td rdng viing dat va dp phi cua dat cung anh hudng nang suat khac bidt hen cac diem thi nghiem.

Bang 1. Y^u td can thdnh ndng suat vd ndng suat eua ba gidng khoai lang tai cdc diim khao nghiem trong vu he thu 2018

TT

1

2

T&n giong

Khoai tim Nhat

Hung Loc

Dia diem

Thanh Trung 1 Tan Thanh Thanh Dong Thanh Trung 2 Tan Binh Trungbinh Thanh Trung 1 Tan Thanh Thanh Dong Thanh Trung 2 Tan Binh

S6 cu to/day 2,2a 2,1b 2,1b 2,2a 2,5a 2,34 3,9b 3,1a 2,4a 3,7b 3,5ab

Nang suat cu

(t/ha) 24,5b 28,4c 23,5b 20,6a 24,7b 24,34 42,0a 31,3b 35,2c 34,9c 33,7c

NScu thuong pham (t/ha)

18,4d 16,2c 15,7b 13,8a 15,3b 15,88 32,8a 26,6b 28,ld 25,0c 18,0c

Ty le cu thuong pham (%)

75,ld 57,04a 66,80b 66,99b 71,94b 67,57 78,08a 84,98b 79,82e 72,04c 53,41d

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KHOA HOC COHG HGHE

3 Khoai tim (d/c)

Tnmg bmh Thanh Trung 1 Tan Thanh Thanh Dong Thanh Trung 2

Tin Binh Trungbinh

3,32 l,5ab 1,3a 1,1a 1,6b 2,0c 1,50

35,42 20,5a 19,2b 21,1c 19,5d 21,3d 20,32

26,1 18,4a 11,6c 12,2c 13,1b ll,6d 13,38

73,68 89,76c 60,4b 57,81a 54.46a 54,47a 65,84 3.2. Thdnh phdn ph&i chat ciia ede gidng khoai

lang tai ede di^m thi nghidm vu hd thu 2018 tai Viiih Long

Ket qua phdn tich b bang 2 cho thay, ham lupng amylose, dudng (fructose, glucose; sucrose) khac nhau khdng c6 y nghia giUa ba gidng. Ham Iuong fructose dao dpng 2,18 - 8,54 mg/g va glucose dao ddng 3,50 - 11,34 mg/g). Gidng khoai lang tim Nhdt cd hdm lupng dudng fructose (8,54 mg/g) va glucose (11,34 mg/g) cao nhdt va cao hon gidng ddi chiing trong khi ham luang dudng sucrose (20,28 mg/g) lai thdp hon gidng khoai tim ddi chung (26,26 mg/g).

Hai chl tieu protein va hnh bpt co bidn dong cd y nghia trdn cdc gidng. Gidng cd ham luong protein cao la khoai tim Nhat (10,68%) cao han gidng doi

Nhat lai thdp han gidng ddi chung. Trong 3 gidng khoai thi nghiem, gidng Hung Ldc co ham Iuong tinh bot cao nhat (75,58%), tiep den la gidng khoai tim ddi chung (74,48%).

Cac gidng khoai thi nghidm trdng d cac dia diem khac nhau nhung co ham lupng p-carotene khde bidt khdng CO y nghia. Gidng cd ham luong p-carotene cao nhat la gidng Hung Lpe (44,78%), bep ddn Id khoai tim Nhat (44,20%) va thap nhat la khoai tim ddi chiing (42,54%).

Cac chi tidu pham chat phan tich cho thay gidng vd dia diem cung khac bidt dieu nay chimg td vimg dat da anh hudng rdt nhidu vd thanh phdn dinh duong the hidn qua su khac bidt vd chat luong cua khoai lang.

ehiing. Trong khi ham Iuong tmh bdt cua khoai tim

Bang 2. Thanh phdn pham chdt cua cac gidng khoai lang tai cdc diem thi nghiem vu he thu 2018 tai Vuih Long

TT

1

2

3 Ten gidng Khoai tim

Nhat

Hung Loc

Khoai tim (d/c)

Dia diem

Tan Hung Tan Thanh Thanh Dong Thanh Loi Thanh Trung

Trungbinh Tan Hung Tan Thanh Thanh Dong Thanh Loi Thanh Trung

Trungbinh Tan Hung Tan Thanh Thanh Dong Thanh LOT Thanh Trung Trungbinh

Amylose

(%)

20,4a 20,6a 20,5a 20,6a 20,4a 20,50 21,8a 21,8a 21,7a 22,0a 22,1a 21,92 21,8a 21,6a 21,6a 21,4b 21,8a 21,64

Protein (mg/ml)

10,8a 10,6a 10,9a 10,5b 10,6a 10,68 6,5a 6,7a 6,5a 6,7a 6,8a 6,64 6,9a 6,7a 6,8a 6,9a 6,9a 6,84

Fructose (mg/g)

8,6a 8,4a 8,5a 8,7a 8,5a 8,54 5,6a 5,7a 5,8a 5,6a 5,6a 5,66 2,3a 2,1a 2,1a 2,3a 2,1a 2,18

Glucose (mg/g) 11,3a 11,5a 11,2a 11,4a 11,3a 11,34 6,9a 6,7a 6,8a 6,9a 6,9a 6,84 3,4a 3,5a 3,6a 3,5a 3,5a 3,50

Sucrose (mg/g) 20,3a 20,1a 20,3a 20,4a 20,3a 20,28 20,1a 20,1a 20,3a 20,1a 20,3a 20,18 26,4a 25,6a 26,5a 26,4a 26,4a 26,26

Tinh bot

(«)

70,1b 70,6a 70,2h 70,6a 70,6a 70,42 75,6a 75,8a 75,6a 75,8a 75,1b 75,58 72,2c 73,6b 73,5b 76,6a 76,5a 74,48

P- carotene

(ug/g) 44,1a 44,2a 44,3a 44,1a 44,3a U,20 47,6a 47,8a 47,9a 47,8a 47,8a 47,78 42,6a 42,3a 42,5a 42,6a 42,7a 42,54

NONG NGHIEP VA PHAT TRIEN NONG THON - KY 1 - THANG 6/2019

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KHOAHOC CdNG NGHE

3.3. Thdnh phan vitamin vd khoang chdt cua cac gidng khoai lang tai cdc di^m thi nghidm vu hd &u 2018

Qua ket qua phdn tich pham chat ghi d bang 3 eho thay thdnh phdn cac chat nhu: vitanune BI, sdt, mangan hau nhu khdng bien ddng nhieu giiia cdc diem ti-en ca 3 gidng tim Nhat, Hung Lpe va gidng ddi chung. Tuy nhidn, thanh phan vitamm C va vitamm A lai ed sir bien dpng cao giua cdc di^m va

3ang 3. Tliinh phan vitamin vd khoang chdt eiia ba gi6ng khoai lang tai cac difai thi nghidm. vu hd tfau 2018 cdc gidng. Nhin chung, eac gidng khoai lang ddu cd ham luong dinh duong eao nhin cae vitamin, cdc khoang chat (sdt, mangan). Gidng khoai Himg Ldc cd ham lupng vitamm C eao nhdt (27,68 mg/100 g).

Trong khi ham lupng sdt cua gidng tim Nhat rat cao (0,617 mg/100 g) cao han giong ddi ehiing didu nay phil hpp vdi Lang va ctv 2014 khi danh gia chat lupng eiia gidng khoai lang tim Nhat trong vu ddng xudn tai Vinh Long.

TT 1

2

3 Tdn gidng Tim Nhdt

Hung Ipc

Khoai tim (d/c)

Dia diem Thanh Trung 1 Tan Thanh Thanh Dong Thanh Trung 2 Tan Binh Trungbinh Thanh Tnmg 1 Tan Thanh Thanh Dong Thanh Trung 2 Tan Binh

Trungbinh Thanh Trung 1 Tan Thanh Thanh Dong Thanh Trung 2 Tan Binh

Trungbinh

Vitamin BI (mg/100 g) 0,282a 0,281a 0,283a 0,281a 0,283a 0,282 0,456a 0,457a 0,459a 0,456a 0,457a 0,457 0,256a 0,231a 0,211a 0,231a 0,211a 0,228

Sat (mg/100 g)

Mangan (mg/100 g)

Vitamm C (mg/100 g)

19,9a 15,6b 11,9c 15,2b 15,2b 15,56 29,9a 28,9b 26,8c 26,5c 26,3c 27,68 12,9b 14,2a 12,1b 12,7b 12,9b 12,97

Vitamin A lU 9781,12a 9752,42a 9634,41b 9265,33d 9532,18c 9593,09 11715,2c 11725,8c 11912,5a 11856,3b 11745,1b 11790,98 8956,ld 9421,4a 9324,3b 9456,5a 9147,1c 9261,08 Thao ludn: hai gidng khoai lang tim Nhdt vd

Hung Lpe ddu thich hop de hdng d cac diem thudc cae xa: Thdnh Ddng, Tan Binh vd Thdnh Trung, huydn Binh Tdn, tinh Vinh Long cho nang suat va chdt lupng rat tdt Gidng khoai lang Hung Ldc va tim Nhdt cd su bidn dpng ve tinh hot, vitamin A, vitamin C eiing nhu hidu qua nang suat cao. Ket qua phan tieh eac chi tidu vd pham chat cho thdy vdi cimg mdt giong nhung trdng d cac dia diem khae nhau thi ed pham chat cung khac nhau. Didu nay chiing to dat trong khoai lang tai huydn Bmh Tan (dat phu sa xen phen nhe) cd tiianh phdn ca gidi nang ndn dung tich hap thu tren flat phdn va ddt phu sa cao hon rat nhidu eac chat dmh duong tong sd vd dd tidu hong dat cimg cao hcra. Dac bidt ham Iuong chat hiru ea trong

dat (phu xa xen phen nhe) d ede vung trdng khoai lang cao han hdn so vdi dat xdm (C tir 2,49-3,18%) la ly do khien hieu luc phdn kali thap. Trong khi hong khoai lang lai rat cdn kah. Ham lupng dam trong ddt o Tdn Thanh thap hon d Thdnh Trung va Thdnh Dong (0,25%, 0,29% theo tiiir tu) Lang va ctv 2014.

4. KET LUAN

Tai huydn Binh Tan, gidng khoai Hung Lpe cd nang suat vupt frpi (35,42 tan/ha), tiep den la gidng khoai tim da phue trang (24,34 tdn/ha). Gidng khoai lang tim Nhdt cd ham lupng dudng fructose (8,54 mg/g) vd glucose (11,34 mg/g) cao nhdt. Gidng Hung Ldc cd ham lucmg p-carotene cao nhat (47,78 ug/g). Ve hdm lupng vitamin va cac chdt khoang, gidng khoai Hung Loc co ham Iuong vitamin C cao NONG NGHIEP VA PHAT TRIEN NONG THON - KY 1 - THANG 6 2019

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KHOA HOC C 6 N G N G H E

nhat 27,68%, trong khi gidng tim Nhdt cd ham lupng sdt rat eao (0,617 mg/lOOg) hon ban gidng ddi chiing.

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Tae gia chan thinh cim on Uy ban Nhan dan tinh Vinh Long, SdKhoa hoe va Cdng nghe tinh Vinh Long da cap lanh phi eung nhu thao luan sd hdu.

Cam on Sd Ndng nghiep va PTNT tinh Vinh Long, UBND huydn Binh Tan, Phdng Ndng nghiep huydn Binh Tan, Vidn Nghidn euu Ndng nghiep Cdng nghd cao DBSCL da cip lanh phi tao dieu kien dd thuc bidn de tai nay. Cim on cic hd gia dinh ndng dan huydn Binh Tin da tham gia thuc hidn thi nghidm.

TAI UEU THAM KHAO

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KHOA HOC CONG NGHE

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STUDY OF THE YIELD AND QUALITY OF SWEET POTATO IN VINH LONG PROVINCE Nguyen TTu Lang', Le Thi True PhuongS Nguyen Trong Phuoc'

^High Agricultural Technology Research Institute for Mekong deltaNietnam (HATRI) Summary

Sweet potato (Ipomoeaebatatas (L.) Lam.\ are important food for humans, in the convolvulaceae family.

Sweet potatoes provide strategies to miprove nutrition and income for the rural population in provine at Vinh Long affected by micronutrient deficiencies. Purple sweet potato vaneties and Hung Loc varietie was in m Vinh Long province as a major crop of the district, Binh Tan (Vinh Long), the productivity record 5 record Hung loc vaneties Township have supenor productivity in the communes of the arrondissement of 35.42 tons/ha. It is ]ust like the purple sweet potato was rehabilitating the yield 24.34 tons/ha. Additionally significant sources of carbohydrates nutntion (96%), plays an important role m the shortage of energy.

Sweet potatoes are a good source of vitamin A than the roots and tubers. Vitamin C is also noteworthy.

Sweet potato contains vitamuis E, BI, E2 and fohc acid. Very rich in minerals supplement the functions of the body such as zinc and calcium. Just like with p-carotene is Hung Loc. Just like mashed potatoes Hung Loc vitamine C content of 27.68% highest. While the ratio of uon look like Purple very high Japanese mg higher than similar 0.617 mg/100 g compared with checked.

Keyvrords: p-carotene, sweetpotato, vitamine C, vitamine A

Ngirdi phdn bi^n: PGS.TS. Nguyin Thi Ngpc Hud Ngdy nhdn bdi: 10/4/2019

Ngdy thdng qua phan bidn: 10/5/2019 Ngay duydt dang; 17/5/2019