Urea yog cov qoob loo cog qoob loo uas feem ntau xav tau thov. Nws lub luag haujlwm tseem ceeb yog kom tsis txhob tso cov khoom phem hauv cov av, thiab daim ntawv thov ntev ntev tsis muaj kev cuam tshuam zoo. Hauv kev lag luam, kua dej ammonia thiab carbon dioxide yog siv los ua cov ntaub ntawv raw kom coj los ua ke ncaj qhaurea nyob rau qhov kub thiab txias thiab ntshav siab. Ntxiv rau qhov tau muab coj los ua kev siv tshuaj lom neeg hauv cov chiv,urea kuj tseem siv tau rau hauv ntau ntau rau lwm yam khoom siv tshuaj, tshuaj, khoom noj khoom haus, cov kuab tshuaj zas xim, dej noo noo noo, thiab viscose fiber ntau nthuav dav, Resin tiav tus neeg sawv cev, diesel cav tso cov pa roj kho thiab lwm yam khoom siv ntau lawm.

Ceev faj nyob rau hauv kev siv ntawm urea:

1. Urea yog tsim nyog rau lub hauv paus chiv thiab hnav khaub ncaws sab saum toj, thiab qee zaum ua noob chiv. Nws yog qhov tsim nyog rau txhua yam qoob loo thiab txhua daim av. Nws tuaj yeem raug siv los ua cov hauv paus chiv thiab hnav khaub ncaws saum toj kawg nkaus. Nws tuaj yeem siv rau hauv cov liaj teb qhuav. Hauv av lossis kua xaum alkaline,urea yog hydrolyzed los tsim ammonium nitrogen, thiab daim ntawv thov saum npoo yuav ua rau ammonia volatilization, yog li sib sib zog nqus npog av yuav tsum thov.

2. Tom qab urea yog txau rau ntawm qhov chaw ntawm lub pob zeb, cov kua hluav taws xob ammonia hloov tom qab hydrolysis yog 10% -30%. Hauv cov av hauv alkaline, qhov poob ntawm nitrogen los ntawm ammonia volatilization yog 12% -60%. Hauv qab ntawm qhov kub thiab qhov kub thiab txias, qhov ammonia volatilization ntawmurea tuaj yeem hlawv cov nroj tsuag thiab ua kom muaj kev tiv thaiv nitrification. Yog li, nws yog qhov tseem ceeb heev uas yuav tsum tau thovurea tob thiab siv dej nqa los nqa chiv.

3. Vim hais tias urea tuaj yeem khaws ntau ntau ntawm ammonium ions nyob rau hauv av, nws yuav nce pH los ntawm 2-3 units. Ib qho ntxiv,urea nws tus kheej muaj qee qhov nqi ntawm biuret. Thaum nws qhov kev kub siab yog 500ppm, nws yuav cuam tshuam cov qoob loo. Cov hauv paus hniav thiab cov hauv paus muaj cov nyhuv inhibitory, yog li ntawdurea tsis yooj yim siv los ua noob chiv, yub chiv thiab chiv chiv. Tusurea cov ncauj lus hauv lwm lub sijhawm ua ntawv thov yuav tsum tsis txhob siv ntau dhau lossis siv ntau dhau. Tom qab cov yub theem cov qoob loo raug puas los ntawm biuret, cov chlorophyll synthesis barrier yog tsim, thiab cov nplooj tshwm chlorosis, daj daj thiab txawm tias thaj ua rau thaj los yog kab txaij.

4. Urea tsis tuaj yeem xyaw nrog alkaline chiv. Tom qaburea yog thov, nws yuav tsum hloov mus rau hauv ammonium nitrogen ua ntej nws tuaj yeem siv los ntawm cov qoob loo. Hauv qab cov xwm txheej alkaline, feem ntau ntawm cov pa hauv ammonium nitrogen yuav dhau los ua ammonia thiab volatilize. Yog li ntawd,urea tsis tuaj yeem ua ke nrog cog ntoo tshauv, calcium calcium phosphate fertilizer, carbon Sib xyaw lossis sib xyaw ua ke thov kev sib xyaw ntawm cov roj ntsha xws li ammonium.

Dab tsi yog qhov zoo ntawm urea ntawm cog kev loj hlob thiab yuav siv nws li cas?

1. Lub luag haujlwm ntawm urea yog yuav tau kho cov paj. 5-6 lub lis piam tom qab tawg, txau 0.5%urea dej daws ntawm nplooj nplaim 2 zaug, uas tuaj yeem ua kom muaj cov ntsiab lus ntau ntxiv ntawm nitrogen nplooj, ua kom nrawm nrawm ntawm cov hlav tshiab, thaiv qhov sib txawv ntawm cov paj tawg paj, thiab ua kom lub xyoo ntawm paj ntau yog tsim nyog.

2. Npaj cov qoob loo loj. Thaum ua ntawv thov, cov qoob loo nrog thaj chaw cog loj dua thiab qhov txiaj ntsig ntawm kev lag luam siab (xws li nplej thiab pob kws) yuav tsum tau txiav txim siab ua ntej. Rau cov qoob loo theem nrab xws li buckwheat, koj tuaj yeem siv daim ntawv thov tsawg dua raws li koj tus kheej kev khwv nyiaj. Los sis txawm tias tsis thov nws, thiab muab tag nrho kev ua si rau cov nyhuv ntawm chiv hauv ntau lawm. Siv raws li hauv paus chiv los yog hnav khaub ncaws sab saum toj.Urea yog tsim rau siv los ua hauv paus chiv thiab hnav khaub ncaws saum toj kawg nkaus. Feem ntau, nws tsis yog siv los ua noob chiv.

3. Thov siv ua ntej. Tom qaburea yog thov rau cov av, nws yog thawj zaug hydrolyzed rau hauv ammonium bicarbonate los ntawm kev ua ntawm cov kab mob av ua ntej nws tuaj yeem nqus tau los ntawm cov hauv paus hniav qoob loo. Yog li, nws yuav tsum tau thov ua ntej. Thovurea tom qab nag ntau li ntau tau muaj zoo noo noo nqus kev kawm. Thaum ua ntawv thov topdressing hauv av qhuav, sim npaj nws tom qab nag kom cov chiv tau sai thiab yaj tau los ntawm cov av.
4. Yog hais tias urea yog khaws tsis raug, nws yuav yooj yim nqus noo noo thiab agglomerate, uas yuav cuam tshuam cov khoom qub ntawm urea thiab coj qee yam nyiaj txiag poob rau cov neeg ua liaj ua teb. Qhov no yuav tsum tau cov neeg ua liaj ua teb khawsurea yog. Nco ntsoov khaws cia rauurea ntim lub hnab khov kho ua ntej siv, daws nws nrog kev saib xyuas thaum lub sijhawm kev thauj mus los, zam nag, thiab khaws nws nyob hauv qhov chaw qhuav thiab zoo tso cua nrog qhov kub hauv qab 20 degrees.

5. Yog tias nws yog qhov kev ntim khoom ntau, siv ntoo square kom pua ​​rau hauv qab txog 20 cm, thiab tawm qhov chaw ntawm ntau tshaj 50 cm ntawm nruab nrab ntawm sab qaum thiab lub ru tsev kom pab txhawb qhov cua thiab noo, thiab tawm ntawm txoj kab nruab nrab ntawm sib tsuam sib nias. Txhawm rau pab tshawb xyuas thiab qhov cua. Yog covurea uas tau qhib hauv lub hnab tsis tau siv tas li, lub hnab qhib yuav tsum tau muab khi rau hauv lub sijhawm kom yooj yim siv tom ntej.