PHÒNG GD & ĐT QUẬN HOÀN KIẾM THCS NGÔ SĨ LIÊN *** Tổ tự nhiên 1

PHNG GD & T QUN HON KIM THCS NG S LIN***T t nhin 1Mn: Cng ngh - Lp 7Tit 21: Thu hoch, bo qun v ch bin nng snGio vin: Ng Thanh Nguyt

Tit 21THU HOCH, BO QUN V CH BIN NNG SN

? Thu hoch nng sn cn t nhng yu cu no.Cn m bo s lng v cht lng

Nn thu hoch la giai on no c nng sut, cht lng tt nht? La giai ona. Ht va v chcb. Ht chn vng uc. Ht chn bng r

? Mun m bo cht lng v s lng cn phi tin hnh nh th no.Tin hnh ng chn,nhanh gn v cn thn

? Nu chng ta thu hoch sm hoc mun th sn phm thu hoch s nh th noNu thu hoch sm th sn phm khng t cht lng, cn thu hoch mun th nng sn s b rng, hoc b thi.Nu khng cn thn s lm gim s lng v cht lng sn phm. ng chn Nhanh gn Cn thn m bo cht lng v s lng nng sn.

Trong cc loi cy trng sau, sn phm thu c l g? Cch thu hoch loi sn phm ?LaMp ng (kh qua)Khoai langCi ngt

Trong cc loi cy trong sau, sn phm thu c l g? Cch thu hoch loi sn phm ?HtQuCLCtHioNhLaMp ng (kh qua)Khoai langCi ngt

Loi cySn phmCch thu hoch

Hy quan st cc hnh a, b, c, d di y v nu tn cc phng php thu hoch vo di cc hnh.a)c)d)b)..BT U

Hy quan st cc hnh a, b, c, d di y v nu tn cc phng php thu hoch vo di cc hnh.a)c)d)b)..CtHiNho

MY CT LAMY CT HOAMY GT P LIN HP

C 4 phng php thu hoch: Ct: la, hoa, bp ci Hi: Cam, qut o: Khoai lang, sn (khoai m) Nh: Su ho, lc (u phng), ci xanh

? Mc ch ca bo qun nng sn l g Hn ch s hao ht v s lng v gim st v cht lng ca nng sn - Cc loi ht:- Rau, qu:- Kho bo qun:Phi hay sy khSch khng gip ntthng thong v c kh trng.

? C my phng php bo qun. ? l nhng phng php no.- Bo qun thng thong:La, ng- Bo qun kn:Rau xanh, cc loi ht- Bo qun lnh:Cc loi rau, qu

Mc ch ca vic ch bin nng sn l g?Lm tng gi tr sn phm v ko di thi gian bo qun.

Quan st cc hnh sau v cho bit chng c ch bin t nhng phng php noBT U

Quan st cc hnh sau v cho bit chng c ch bin t nhng phng php noSy khMui chuaCh bin thnh bt mn hay tinh btng hp

? C my phng php ch binC 4 phng php: Sy kh Ch bin thnh bt mn hay tinh bt Mui chua ng hp

Em hy cho bit l sy th cng nh hnh 32(sgk) c th sy nhng loi nng sn g?Khoai lang, khoai ty, sn, ng

T sy tng soiMy ng gi cc sn phm ( u phng, bnh phng tm, c ph)

Cu 1. m bo v s lng v cht lng ca nng sn chng ta cn phi tun theo nhng yu cu g trong qu trnh thu hoch?CNG C - ng chn - Nhanh gn - Cn thnp nCu 2. Trnh by cc iu kin bo qun tt nng sn?p nCc loi ht: phi hay sy Rau, qu: sch khng gip, nt Kho bo qun: thng thong v c kh trng.

TRC NGHIMa- ng hp,sy kh, mui chua, tinh btb- Ch cn sy kh v ng hp l bo qun ttc- ni thong mt l d-Ch bin thnh tinh bt v mui chua1 C nhng phng php ch bin no?

TRC NGHIM

a- Ct, ta, dmb- Hi, ct, nh, oc- Nh, ta, dm, ctd- Ct, nh, o,ta dm2. C nhng phng php thu hoch no ?

CNG VIC V NHHc bi v tr li cc cu hi SgkXem trc bi 21. Lun canh, xen canh, tng v.