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QUY TRINH LY MU RAU, QU TAI RU NG SAN XU T

Ti?u chu?n vi?n d?n . Phuong ph?p l?y m?u du?c FAO khuy?n c?o d?ng trong ki?m tra du lu?ng thu?c b?o v? th?c v?t c?a rau qu? tr?n d?ng ru?ng.Recommended sampling methods for supervised field trials, P119-130, Submission and evaluation of pesticide residues data for the estimation of maximum residue

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QUY TRINH LY MU RAU, QU TAI RU NG SAN XU T

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    1. QUY TRI`NH L?Y M?U RAU, QU? TA?I RU?NG SA?N XU´T CIDA

    2. Tiu chu?n vi?n d?n Phuong php l?y m?u du?c FAO khuy?n co dng trong ki?m tra du lu?ng thu?c b?o v? th?c v?t c?a rau qu? trn d?ng ru?ng. Recommended sampling methods for supervised field trials, P119-130, Submission and evaluation of pesticide residues data for the estimation of maximum residue levels in food and feed, ISN 0259-2517, FAO 2002 Quy trnh ny quy d?nh phuong php l?y m?u ki?m nghi?m du lu?ng thu?c b?o v? th?c v?t va` vi sinh d?i v?i rau qua? ta?i ru?ng hoa?c vuo`n sa?n xut

    3. Th? t?c l?y m?u Ngu?i l?y m?u: Vi?c l?y m?u ph?i do ngu?i l?y m?u du?c cc bn c lin quan u? quy?n v d du?c c?p ch?ng ch?. Ch?ng ch? l?y m?u rau, qu? do C?c tr?ng tr?t c?p. Ngu?i l?y m?u lm vi?c d?c l?p, khng ch?p nh?n s? can thi?p t? bn ngoi. Ngu?i l?y m?u c th? du?c ngu?i khc gip d?, nhung v?n ph?i ch?u trch nhi?m chnh. Bin b?n l?y m?u: Khi l?y m?u, giao, nh?n m?u ph?i c bin b?n c ch? k c?a bn l?y m?u v ch? hng. Cc m?u g?i phng th? nghi?m ph?i km theo bin b?n l?y m?u (xem Ph? l?c) v?i d?y d? ch? k c?a ngui l?y m?u v d?i di?n co s? du?c l?y m?u. Cc thng tin trong bin b?n ph?i du?c ghi d?y d? tru?c khi phn tch m?u d? dua ra quy?t d?nh v? s? ph h?p c?a m?u.

    4. Phuong php l?y m?u Thng thuo`ng 12 m?u don du?c l?y tra?i d`u trn ru?ng m?t cach h? thng theo hnh ch? W, X hoa?c chu~ S hoa?c ki?u Ziczac. Ngoa`i ra m~u co th? duo?c ly hoa`n toa`n ng~u nhin. Khng ly ta?i cac goc va` vi? tri d`u ru?ng. Tho`i di?m ly m~u: ta?i tho`i di?m thu hoa?ch thng thuo`ng. D?ng c? l?y m?u, luu m?u, b?o qu?n m?u ph?i d?m b?o khng c b?t k? tc d?ng no ?nh hu?ng t?i du lu?ng thu?c va` vi sinh v?t ? m~u rau qua? c?n ki?m nghi?m. L?y m?u ki?m tra ph?i d?m b?o khng c b?t k? tc d?ng no ?nh hu?ng d?n du lu?ng thu?c BVTV va` vi sinh v?t trong m~u rau qua? c?n ki?m nghi?m. Khng duo?c ru?a cu~ng nhu du`ng du?ng cu? d? la`m sa?ch rau qua? (ba`n cha?i). Ring di voi rau an cu? nhu ca` rt, khoai ty, khoai lang co th? du`ng du?ng cu? d? la`m sa?ch dt nhung khng duo?c la`m xy xat nng sa?n ph?m. Khng duo?c cat go?t nng sa?n tru` vi?c loa?i bo? cac la gia` ua bn ngoa`i nhu nng dn v~n thu?c hi?n. Bt cu vi?c su? du?ng dao keo na`o va`o nng sa?n cu~ng pha?i duo?c ghi la?i.

    5. Thit bi?, d?ng c? Tui ti?t tru`ng d? du?ng m~u phn tich vi sinh Tui nhu?a m`m thng thuo`ng (moi) d? du?ng m~u phn tich hoa ho?c Gang tay du`ng m?t l`n Dao, keo, du?ng cu? cat ca`nh ti?t tru`ng Du?ng cu? da`o boi (cuc, xe?ng...) H?p giu~ la?nh 70 x 70 x 70cm. kh ho?c gel gi? l?nh: 1kg/1kg s?n ph?m. T?i thi?u 10kg/h?p, ph?i d? dng tru?c khi di l?y m?u.

    6. Cch l?y m?u M?u don: L m?u l?y t? cc di?m khc nhau trong ru?ng c?n ki?m tra. M?i m?u don du?c l?y t? m?t vi? tri trn ru?ng. M?u ban d?u: L m?u g?p c?a t?t c? cc m?u don. M?u trung bnh: L m?t ph?n ho?c t?t c? cc m?u ban d?u du?c tr?n d?u. M?u trung bnh ki?m tra du?c chia lm ba don vi?, m?t ph?n dng d? ki?m nghi?m, m?t ph?n d? co quan ki?m nghi?m luu m?u, m?t ph?n d? t? ch?c, c nhn c m?u ki?m tra luu m?u.

    7. L?y m?u rau cc lo?i i voi rau an la noi chung: thu ca? cy. Nu m~u ban d`u chua du? 1kg thi` co th? tang s m~u don. i voi rau an qua?: Ly 12 qua? tu` 12 cy khac nhau. Ly m~u ta?i cac vi? tri bi? la che khut va` ca? cac vi? tri khng bi? la che khut khi phun thuc. Nu qua? nho? thi` co th? ly 2-10 qua?/cy d? t?ng kh?i lu?ng m?u kho?ng 1kg. i voi cac loa?i d?u d~: Khi luo?ng m~u ti thi?u c`n ly la` 1,0 kg. Ly m~u ta?i cac vi? tri bi? la che khut va` ca? cac vi? tri khng bi? la che khut khi phun thuc. Cac loa?i rau an la nho? hoa?c rau gia vi?: khi luo?ng m~u ti thi?u c`n ly la` 0,5kg. i voi rau tr`ng trong ch?u, khay: ly m~u tu` 12 ch?u, khay khac nhau.

    8. L?y m?u cy an qua? Cac m~u don thuo`ng duo?c ly tu` 4 cy khac nhau phn b theo duo`ng cheo goc. Tuy nhin v~n co th? ly ng~u nhin tu` 4 cy bt ky` na`o. Tranh cac cy bi? b?nh hoa?c bt thuo`ng so voi cac cy khac. i voi cac qua? co~ lon nhu xoa`i, buo?i: 12 qua? co vi? tri khac nhau (huong, t`ng) tu` 4 cy trong vuo`n. Nu khi luo?ng m~u g?p chua du? 2 kg thi` nn ly thm qua? tu` cac cy khac. Dua cu~ng ly 12 qua?. i voi qua? nho? nhu xo ri, tao ta, chanh ta: ly du? 1kg o? cac vi? tri khac nhau tu` 4 cy.

    9. V? tr l?y m?u Ta?i ru?ng Ly m~u co h? thng Hi`nh chu~ W 12 di?m

    10. Trn cy Ly m~u ng~u nhin L?y c? cy L?y t? m?t s? v? tr trn cy

    11. L?y 02 m?u cng lc

    12. B?o qu?n M?u ki?m nghi?m vi sinh du?c b?o qu?n trong th?i gian khng qua 48 gio` o? nhi?t d? 1-5oC. M?u ki?m tra du lu?ng thu?c BVTV co th? du?c b?o qu?n trong th?i gian 3 thng trong di`u ki?n dng la?nh. Khng du?c r dng tru?c khi ti?n hnh phn tch.

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