Raws li urea BAI yog cov organic nitrogen chiv, nws tsis tuaj yeem nqus thiab siv ncaj qha los ntawm cov qoob loo tom qab muab tso rau hauv av DU av. Nws tuaj yeem tsuas yog nqus tau thiab siv cov qoob loo tom qab tau decomposed rau hauv ammonium bicarbonate nyob rau hauv kev ua ntawm DAO ntawm av cov kab mob me me. Kev hloov pauv ntawm urea hauv cov av muaj feem xyuam rau qhov ntsuas kub, noo noo thiab av.

Feem ntau, thaum lub caij nplooj ntoo hlav thiab lub caij nplooj zeeg, txoj kev lwj ua kom nce mus txog qhov siab kawg nyob ib ncig ntawm 1 lub lim tiam, thiab lub caij ntuj sov, nws kav ntev li 3 hnub. Yog li no, thaum urea siv los ua topdressing, nws yuav tsum txiav txim siab thov urea ob peb hnub ua ntej.

Urea belongs rau cov nruab nrab cov nruab nrab, siv rau txhua yam ntawm cov qoob loo thiab av, tuaj yeem siv los ua cov hauv paus chiv thiab cov tso siab, tab sis tsis yog rau kev cog chiv thiab nplej teb nrog chiv. Vim tias urea muaj cov nitrogen siab thiab qhov me me ntawm biuret, nws yuav cuam tshuam rau cov noob cog qoob thiab cov noob cog kev loj hlob.

Yog tias urea yuav tsum siv cov noob chiv, nws yog ib qho tsim nyog yuav tsum tswj hwm kom zoo ntawm cov chiv thiab tsis txhob tiv tauj nrog cov noob. Rau lub hauv paus chiv ntawm 225 ~ 300 kg ib hectare thiab rau kev tso siab saum toj ntawm 90 ~ 200 kg ib hectare, av yuav tsum tau thov sib sib zog nqus txhawm rau tiv thaiv cov pa nitrogen. Urea yog qhov zoo tshaj plaws rau cov nplooj chiv ua daim ntawv thov, tsis muaj cov khoom siv sab hauv, yooj yim rau nqus los ntawm cov nplooj qoob loo, cov nyhuv chiv yog ceev, txiv hmab txiv ntoo ntoo txau cov tshuaj lom yog 0.5% ~ 1.0%, thaum sawv ntxov lossis yav tsaus ntuj cov txau rau cov nplooj qoob , hauv lub sijhawm loj hlob lossis nruab nrab thiab qib theem, txhua 7 ~ 10 hnub ib zaug, tshuaj tsuag 2 ~ 3 zaug. Urea tuaj yeem ua kom yaj nrog potassium dihydrogen phosphate, ammonium phosphate thiab tshuaj tua kab, fungicides, txau ua ke, tuaj yeem ua lub luag haujlwm ntawm kev tso tshuaj, tshuaj tua kab, tiv thaiv kab mob.