1. PDF-XChange 1 2.3. Tnh cht vt l c bn ca khi ht 1 I. Thnh phn & c tnh chung ca khi nng sn II. Kh nng tan ri & tng phn cp III. 0t & trng rng ca khi nng Vn IV. Tnh dn nhit & lng nhit dung V. Tnh hp ph, nh kh v ht m VI. Dung trng v t trng 2.3. Tnh cht vt l c bn ca khi ht Thnh phn ca khi nng sn trong BQ - Loi nng sn m ta mun thu hoch/BQ. - Loi nng sn khc ging loi vi loi NS chnh - Cc cu t Vng khc. - Cc tp cht hu c. - Khng kh tn ti cc khe h gia cc cu t trong khi nng sn. - +i nc, 2 PDF-XChange Click to buy NOW! www.docu-track.com Click to buy NOW! www.docu-track.com

2. PDF-XChange 2 2.3. Tnh cht vt l c bn ca khi ht Tnh tan ri ca khi nng sn: Khi niP tan ri ca NS: Nhiu c th Wp hp li thnh mt khi Kt. V tr ca chng trong qu trnh BQ Ku nh khng thay i nhng c kh Qng biQ ng Pt mF nhW nh. Kh Qng ny gi l tnh tan ri hay tnh OX ng. 3 2.3. Tnh cht vt l c bn ca khi ht Cc yu t ph thuc: - Hnh dng, kch thc, ng u, trng thi bn ngoi ca nng sn. - 7p cht ca khi nng sn (%). - Thu phn ca nng sn. - Thao tc k thut trong vn chuyn ht. - Thi gian bo qun. - cao ht cht xp trong kho. 4 PDF-XChange Click to buy NOW! www.docu-track.com Click to buy NOW! www.docu-track.com

3. PDF-XChange 3 2.3. Tnh cht vt l c bn ca khi ht i lng & PP xc nh tan ri ca khi nng sn: - Gc nghing t nhin (gc tnh ti) - Gc trt: ph thuc vo mt phng, con ngi, phng php ly mu, 5 2.3. Tnh cht vt l c bn ca khi ht ngha cD tan ri: - 6 E kim tra phm cht ca nng sn, c bit l nng sn kh. - ' dng cha nng sQ Gng ri trong cc dng c ng khc. - +n ch c nhng h Ki trong qu trnh bo qun. - Tnh sc bn tng kho. 6 PDF-XChange Click to buy NOW! www.docu-track.com Click to buy NOW! www.docu-track.com

4. PDF-XChange 4 2.3. Tnh cht vt l c bn ca khi ht TT Tn ht Gc nghing TN (o) Sai khc (o) 1 Thc 34-45 10 2 Ng 30-40 10 3 La m 23-38 15 u tng 24-32 8 5 Vng (m) 27-34 7 7 2.3. Tnh cht vt l c bn ca khi ht II.2. Tnh tng phn cp Khi nim: Khi nng sn (khi ht) khi di ng th ton th cc c th chu tc ng tng hp FD Lu kin ngoi cnh, c tnh vt l Fa bn thn Wo nn s phn phi mi, lc ny cc ht c tnh cht tng t nhau s c xu hng tp trung li mt ch. Hin Wng ny gi l t ng phn cp ca ht. 8 PDF-XChange Click to buy NOW! www.docu-track.com Click to buy NOW! www.docu-track.com

5. PDF-XChange 5 2.3. Tnh cht vt l c bn ca khi ht Khi ht Ui t trn cao xung hnh thnh mt khi hnh chp, Kt chc v tp cht nng u tp trung gia khi, Kt lp, ht v v Wp cht nh Wp trung xung quanh khi ht. Khi ht W kho chy ra Fng pht sinh t ng phn cp nh Yy. Ht chc v c KLR chy ra trc, ri PL n cc ht phm cht km v tp cht nh chy ra sau. 9 2.3. Tnh cht vt l c bn ca khi ht Tnh t ng phn cp ph thuc: - Cht lng nng sn - 7 O Wp cht & loi tp cht ln vo. - Qu trnh vn chuyn v k thut nhp kho, xut kho. 10 PDF-XChange Click to buy NOW! www.docu-track.com Click to buy NOW! www.docu-track.com

6. PDF-XChange 6 2.3. Tnh cht vt l c bn ca khi ht ngha: nh hng xX n cng tc gi gn cht lng Fa khi nng sn kh, dng ht. Tnh ng u ca ht gim thp, nh hng Q chnh xc khi ly mu kim nghim. Gy hi cho khi nng sn cn bo qun. V d: +t lp, v, tp cht nh Wp trung li mt ch, chng d ht m v h hp mnh, s sinh nhit tR Lu kin cho vi sinh vt hoW ng. 6 Gng phn loi nng sn kh dng ht c cht lng tt, xu v lm sch ht. 11 2.3. Tnh cht vt l c bn ca khi ht Bin php hn ch tnh t phn loi: - Nhp kho nng sn c cht lng ng u, sch s v t b On tp cht. - Nhp v xut nng sn kh dng ht vo kho phi nhp nhng, thng dng cc chp nn t ng quay. - Thng xuyn co, R lm gim bt hin tng t phn loi. 12 PDF-XChange Click to buy NOW! www.docu-track.com Click to buy NOW! www.docu-track.com

7. PDF-XChange 7 2.3. Tnh cht vt l c bn ca khi ht 0W trng rng ca khi nng sn Khi nim: - Ta c mt khi ht, gi khong khng gian m khi ht chim trn thc t l V trong : th tch ht chim l V1, khong cch gia cc ht v cc khong khng gia ht l V2. 13 Khi : 2.3. Tnh cht vt l c bn ca khi ht 14 +) 0W Kt T = (V1 / V) * 100% Hay T = ((V V2)/ V) *100% +) trng Ung R = 100 T hay R = ((V V1)/V) * 100% - trng Ung tng th mW gim. PDF-XChange Click to buy NOW! www.docu-track.com Click to buy NOW! www.docu-track.com

8. PDF-XChange 8 2.3. Tnh cht vt l c bn ca khi ht Nhng yu t ph thuc: - Hnh dng ca nng sn & tnh cht b Pt ca nng sn. - Kch thc ca nng sn ng u) - Phng thc nhp kho, vn chuyn. - cao ca khi nng sn, hnh thc kho, lng Kt bo qun trong kho. - Hm lng nc. - Dung trng t nhin. - 7 O Wp cht & loi tp cht ln vo khi NS. 15 2.3. Tnh cht vt l c bn ca khi ht STT Tn nng sn trng rng (%) 1 Thc (la) 50-56 2 Ng 35-55 3 %t 35-40 4 Khoai, sn kh 60-75 16 PDF-XChange Click to buy NOW! www.docu-track.com Click to buy NOW! www.docu-track.com

9. PDF-XChange 9 2.3. Tnh cht vt l c bn ca khi ht ngha trong cng tc bo qun NS: - Khng kh, hL m, nhit d dng i Ou. - Thng gi cng bc gii phng nhit, m v khng kh c. - Xng hi thuc tr Gch hi & XL c Ki thuF c sau khi x l. 17 2.3. Tnh cht vt l c bn ca khi ht Tnh dn nhit ca khi ht - HSDN l lng nhit truyn qua 1m2 Fa khi ht dy 1m trong 1 gi lm cho nhit gia lp trn v lp di chnh nhau 10C. n v (kcal/m.gi.0C). - Dh = 0,1 - 0,2 (kcal/m.gi.0C). - t = 200C: Dkk = 0,0217 (kcal/m.gi.0C). 18 Dn = 0,510 (kcal/m.gi.0C). PDF-XChange Click to buy NOW! www.docu-track.com Click to buy NOW! www.docu-track.com

10. PDF-XChange 10 2.3. Tnh cht vt l c bn ca khi ht