Txoj kev hloov phosphate fertilizer

Kev hloov pauv ntawm superphosphate hauv av: Tom qab superphosphate siv rau hauv av, cov tshuaj tiv thaiv tseem ceeb yog kev tawg ntawm cov khoom sib txawv. Uas yog, tom qab fertilization, dej sib sau ua ke mus rau lub fertilization point kom yaj thiab hydrolyze monocalcium phosphate los tsim ib tug saturated tov ntawm monocalcium phosphate, phosphoric acid thiab dicalcium phosphate nrog dej, thiab cov tshuaj tiv thaiv yog raws li nram no:
Lub sijhawm no, qhov concentration ntawm phosphorus nyob rau hauv cov av daws nyob ib ncig ntawm qhov chaw fertilization yuav siab li 10mg/kg-20mg/kg, kom cov phosphoric acid txuas ntxiv mus rau sab nraud. Thaum lub sij hawm fertilization, pH ntawm saturated tov nyob rau hauv micro-domain av ntau yuav ncav cuag 1-1.5. Nyob rau hauv cov txheej txheem ntawm sab nrauv diffusion, nws muaj peev xwm yaj hlau, txhuas, calcium, magnesium, thiab lwm yam nyob rau hauv cov av, thiab cuam tshuam nrog phosphate ions los tsim phosphates nrog solubility sib txawv. Nyob rau hauv calcareous av, phosphorus thiab calcium reacts tsim dicalcium phosphate thiab octacalcium phosphate, thiab thaum kawg feem ntau ntawm lawv tsim ruaj khov hydroxyapatite. Hauv cov av acidic, monocalcium phosphate feem ntau reacts nrog hlau thiab txhuas los ua hlau phosphate thiab txhuas los nag, thiab tom qab ntawd ntxiv hydrolyzes rau hauv cov hlau txhuas phosphate. Nyob rau hauv cov av tsis muaj zog acidic, monocalcium phosphate yog yooj yim adsorbed thiab tsau los ntawm av nplaum minerals. Hauv cov av nruab nrab, calcium superphosphate tsuas yog hloov mus rau hauv CaHPO4·2H2O thiab yaj Ca(H2PO4)2, uas yog lub xeev zoo tshaj plaws rau phosphorus muaj peev xwm ntawm cov qoob loo. CaHPO4·2H2O tsis muaj zog acid-soluble thiab tseem nyob ntawm qhov chaw fertilization, yog li kev txav ntawm superphosphate hauv cov av me me, nrog rau kab rov tav ntawm 0.5cm thiab qhov tob tsis tshaj 5cm, thiab nws qhov kev siv txhua xyoo kuj yog. tsawg heev, feem ntau yog 10 feem pua ​​-25 feem pua ​​.
Kev hloov pauv ntawm calcium magnesium phosphate fertilizer hauv av: Calcium magnesium phosphate fertilizer tuaj yeem yaj nyob rau hauv qhov kev txiav txim ntawm acid secreted los ntawm cov qoob loo cov hauv paus hniav thiab cov kab mob rau kev nqus thiab siv los ntawm cov qoob loo.
Kev hloov pauv ntawm phosphate pob zeb hmoov hauv av: Tom qab phosphate pob zeb hmoov yog siv rau hauv av, nws yuav maj mam decompose nyob rau hauv qhov kev txiav txim ntawm cov tshuaj, biochemical thiab biological yam tseem ceeb, hloov lub qub lub xeev thiab transforming rau hauv tshiab phosphorus tebchaw.
Lub ntsiab tseem ceeb cuam tshuam rau qhov kev hloov pauv no yog av pH, Ca2 ntxiv rau cov concentration thiab H2PO4- concentration. Obviously, acidic tej yam kev mob yog conducive rau no hloov dua siab tshiab ntawm phosphate pob zeb hmoov, yog li ntawd phosphate pob zeb hmoov yog siv rau acidic av. Fertilizer efficiency yog siab dua.