Urea, tseem hu ua carbamide, yog tsim ntawm carbon, nitrogen, oxygen, hydrogen organic compound yog cov siv lead ua dawb, yog tam sim no cov ntsiab lus siab tshaj plaws ntawm nitrogen chiv. Urea muaj cov pa roj carbon ntau nyob rau hauv, kev thov tshuaj yuav tsum tsis txhob loj dhau, yog li kom zam kev pov tseg tsis tsim nyog thiab "chiv ua puas". Cov neeg ua liaj ua teb nyob hauv ntau qhov chaw ua cov txiv hmab txiv ntoo siv ntau lub urea, ua rau cov ntoo tuag, qhov kev rau txim loj heev. Hnub no peb yuav qhia qhov kev siv kom zoo ntawm urea.

Siv urea kaum kev 

Sib xyaw nrog ammonium bicarbonate

Tom qab urea tau muab tso rau hauv av, nws yuav tsum tau hloov mus rau hauv ammonia ua ntej nws tuaj yeem nqus tau los ntawm cov qoob loo, thiab nws cov kev hloov pauv tau qeeb qeeb hauv qab cov alkaline dua li nyob rau hauv cov kua qaub. Tom qab ammonium bicarbonate tau thov rau hauv av, qhov tshuaj tiv thaiv yog alkaline, thiab tus nqi pH yog 8.2 ~ 8.4. Kev ua liaj ua teb ua kom muaj ammonium bicarboate thiab urea, yuav ua rau hloov ntawm urea mus rau hauv ammonia nrawm qeeb qeeb, yooj yim ua rau urea poob thiab volatilization poob. Yog li no, urea thiab ammonium bicarbonate yuav tsum tsis txhob siv rau kev sib xyaw lossis ib txhij. 

Zam kev tshaj tawm saum npoo

Urea kis tau rau hauv av thiab tsuas yog siv tau tom qab 4-5 hnub ntawm kev hloov pauv ntawm chav sov. Feem ntau cov nitrogen tau yooj yim volatilized hauv cov txheej txheem ammonification, thiab tus nqi siv tiag tsuas yog li 30% xwb. Yog tias kis tau hauv alkaline av thiab av nrog cov ntsiab lus siab organic, nitrogen poob yuav sai dua thiab ntau dua. Thiab urea ntiav thov, yooj yim yuav tsum tau haus los ntawm cov nroj. Urea yog thov tob thiab yaj hauv av kom lub chiv yog nyob rau txheej av noo, uas tau txais txiaj ntsig zoo rau cov txiaj ntsig ntawm chiv. Qhov kev hais sab saud yuav tsum tau ua rau ntawm txoj kev tawm ntawm cov yub nrog lub qhov lossis trenches, thiab qhov tob yuav tsum yog li 10-15cm. Txoj kev no, urea yog muaj nyob rau hauv qhov ntom ntawm txheej txheej hauv paus, uas ua rau muaj kev nqus thiab siv qoob loo. Cov kev sim tau pom tias kev siv tus nqi ntawm urea tuaj yeem raug nce li 10% ~ 30%.

Peb tsis cog chiv

Urea hauv cov txheej txheem ntau lawm, feem ntau tsim cov khoom lag luam me me, thaum cov ntsiab lus ntawm biuret ntau dua 2% yuav muaj tshuaj lom rau cov noob thiab cov noob, cov urea mus rau hauv cov noob thiab cov noob, yuav ua rau cov protein ua kom tsis zoo, muaj feem cuam tshuam rau kev yaug thiab yub kev loj hlob ntawm noob, yog li nws tsis haum rau cog chiv. Yog tias nws yuav tsum raug siv los ua noob chiv, zam kev sib cuag ntawm cov noob thiab chiv thiab tswj kev siv tshuaj.

Plaub zam tam sim ntawd tom qab dej

Urea belongs rau amide nitrogen fertilizer, uas yuav tsum tau hloov mus rau hauv ammonia nitrogen yuav tsum tau nqus thiab siv los ntawm cov hauv paus system ntawm cov qoob loo. Vim muaj cov av zoo sib txawv, dej thiab qhov kub thiab txias, cov txheej txheem hloov siab siv sijhawm ntev lossis sijhawm luv. Feem ntau, nws tuaj yeem ua tiav tom qab 2 ~ 10 hnub. Feem ntau, kev saib xyuas dej yuav tsum tau ua 2 ~ 3 hnub tom qab thov rau lub caij ntuj sov thiab caij nplooj zeeg, thiab 7 ~ 8 hnub tom qab thov rau lub caij ntuj no thiab caij nplooj ntoo hlav.