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Bi 12:

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Ln c vai tr quan trng trong isng ca cy trng. Ln c trongthnh phn ca ht nhn t bo, rtcn cho vic hnh thnh cc b phnmi ca cy.Ln tham gia vo thnh phn ccenzim, cc prtin, tham gia vo qu

trnh tng hp cc axit amin.Ln kch thch s pht trin ca r cy,

lm cho r n su vo t v lan rngra chung quanh, to thm iu kincho cy chng chu c hn v t ng.

Ln kch thch qu trnh nhnh, ny

chi, thc y cy ra hoa kt qu smv nhiu.Ln lm tng c tnh chng chu cacy i vi cc yu t khng thun li:chng rt, chng hn, chu chua

ca t, chng mt s loi su bnhhi v.v

Phn ln cung cpcho cy didng

ion

photphat

dinh dngcaphn ln cnhgi theo tlphntrmkhilngP2O5 tngngvilng P c trongthnh phnca n

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Supephotphat nCha 14-20% P2O5.

Qu trnh sn xut xy ra 1 giaion bng cch cho btphotphoric hoc apatit tcdng vi

axit sunfuric c:Ca3(PO4)2 + 2H2SO4(c)

Ca(H2PO4)2 + 2CaSO4Gm 2 mui:Ca(H2PO4)2 v

CaSO4

Cy trng ch ng ha cmui d tan Ca(H2PO4)2;cnCaSO4 khng tan trong nc,l phn khng c ch, lm rnt.

Suprphotphat kp

- Cha 40-50% P2O5

- Qu trnh sn xut xy ra 2giai on: iu ch axit

photphoric, v cho axitphotphoric tc dng viphotphoric hoc apatit:

Ca3(PO4)2 + 3H2SO4(c)3H3PO4+ 3CaSO4

Ca3(PO4)2 + 4H3PO4

3Ca(H2PO4)2-Gm 1 mui: Ca(H2PO4)2

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Thnh phn chnh ca phn ln nung chy l hn hpphotphat v silicat ca canxi v magi(cha 12-14% P2O5). Cc mui ny khng tan trong nuc, nnch thch hp cho loi t chua.

Canxi SilicatCanxi Photphat Magie Silicat MagiePhotphat

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snxu t phn ln nung chy, ngi ta nung hnhpqung apatit (hay photphoric) vi x vn (thnh phn chnhl magi silicat) v than cc nhit 10000C trong lng.sdnphm nng chyt l i ra c lm ngui nhanhbngnckhichtbv thnh cc htvn, sau sykh v nghin thnh bt.

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nc ta hin nay, phn ln nung chy c snxut Vn in (H Ni) v mt s a phng khc.

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Nhng nh nh t 3 cng thchin

Nguyn Quang Lc Trn Th Hiu Tho V Minh Thy L Thnh Nam

Chu Quang Khnh

Hong Tun Nam Phm Minh Qun Cao Phng Vn

Trn Th Bo Ngc Nguyn Lan Vy

Trnh Minh Trng

Cm n cc bn ch

theo di v lng nghebi thuyt trnh ca t

mnh