Dab tsi yuav tsum xyuam xim rau thaum thov urea
1. Sim tsis txhob siv nws ib leeg. Txoj kev thov zoo tshaj plaws yog thawj zaug siv cov organic chiv, thiab tom qab ntawd siv urea, superphosphate, potassium chloride thiab lwm yam chiv hauv cov qauv tsim nyog.
2. Urea tsis tuaj yeem tov nrog ammonium bicarbonate. Kev sib xyaw ua ke ntawm ammonium bicarbonate thiab urea yuav ua rau qeeb ntawm kev hloov pauv ntawm urea rau hauv ammonia, uas yooj yim ua rau urea poob thiab volatilization poob.
3. Urea tsis tuaj yeem muab dej tam sim tom qab siv urea. Urea yog ib qho amide nitrogen chiv uas yuav tsum tau hloov mus rau hauv ammonia nitrogen tom qab thov kom thiaj li nqus tau thiab siv los ntawm cov qoob loo. Yog tias siv tam sim tom qab dej lossis ua ntej los nag hnyav, urea yuav ploj.
Yuav ua li cas siv Urea yam tsis muaj khib nyiab
1. Txiav txim siab tus nqi ntawm topdressing raws li av fertility. Kev xyaum qhia tau hais tias nce tus nqi ntawm cov chiv siv rau nruab nrab mus rau qis yield teb tuaj yeem nce yield. Rau high-yield teb, nws yog txaus los tuav ib tug general theem ntawm fertilization.
2. Kev hnav khaub ncaws saum toj kawg nkaus thaum lub caij noj zaub mov zoo tshaj plaws ntawm cov qoob loo. Tus yuam sij rau kev txhim kho qhov kev siv ntawm topdressing chiv yog los tuav lub sij hawm tseem ceeb thiab ntau dua efficiency lub sij hawm ntawm cov as-ham los ntawm ntau cov qoob loo, thiab sim topdressing thaum lub sij hawm lub ncov ntawm cov qoob loo nyob rau hauv thiaj li yuav txhim kho cov kev siv ntawm chiv.
3. Urea yuav tsum tau siv tob rau hauv av. Thaum siv urea rau cov qoob loo qhuav, nws raug nquahu kom khawb pits lossis khawb trenches nrog qhov tob ntawm tsawg dua 10 centimeters kom cov urea hauv cov av noo, uas yog qhov zoo rau kev hloov pauv ntawm urea thiab adsorption ntawm ammonia chiv los ntawm cov av. , txo volatilization poob.
4. Urea yuav tsum tau siv ua ntej. Vim hais tias urea yog ib qho tsis tshua muaj molecular organic compound, yuav tsum muaj cov txheej txheem ammonification tom qab nws siv rau hauv av, hloov mus rau hauv ib qho tsis muaj zog ammonium carbonate ua ntej nws tuaj yeem nqus tau los ntawm cov hauv paus qoob loo. Yog li ntawd, thaum topdressing qoob loo nrog urea, nws yuav tsum tau siv li ntawm 7 hnub ua ntej tshaj lwm cov chiv nitrogen.
5. Urea tsis tuaj yeem tov nrog alkaline chiv. Urea belongs rau qhov nruab nrab cov chiv, thiab yuav tsum tsis txhob tov nrog alkaline chiv thaum topdressing los tiv thaiv kom tsis txhob chiv efficiency. Yog tias nws tsis tuaj yeem tov nrog alkaline chiv, cov hnub fertilization yuav tsum tau staggered, feem ntau txhua txhua 3-5 hnub.
6. Urea yuav tsum tau siv los ua hauv paus hnav khaub ncaws. Urea tsis tshua muaj kev puas tsuaj rau cov nplooj nplooj, yooj yim soluble nyob rau hauv dej, muaj zog diffusion, yog yooj yim absorbed los ntawm nplooj, thiab tsis yooj yim rau ua rau phab ntsa sib cais tom qab nkag mus rau nplooj, ua rau nws tsim nyog rau topdressing sab nraum cov hauv paus hniav. Tab sis zoo urea nrog cov ntsiab lus biuret tsis pub tshaj 2% yuav tsum tau xaiv los tiv thaiv kev puas tsuaj rau nplooj.
