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 khoom siv los ua kom ncaj qha rau urea hauv qab qhov kub thiab kub siab. Ntxiv rau qhov raug siv los ua cov tshuaj lom neeg ua kom zoo, urea kuj tseem siv tau rau hauv cov khoom siv tshuaj loj, tshuaj, khoom noj, cov kuab tshuaj zas, noo noo ntxaum, thiab viscose fiber nthuav, Resin tiav rau tus neeg sawv cev, diesel cav tso pa roj kho thiab lwm cov ntaub ntawv ntau lawm.

Ceev faj nyob rau hauv kev siv 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 cov av xaum los yog alkaline, urea yog hydrolyzed los tsim ammonium nitrogen, thiab daim ntawv thov saum npoo yuav ua rau ammonia volatilization, yog li cov npog av uas tob yuav tsum muaj thov.

2. Tom qab urea tsuag rau saum npoo av cog qoob, 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 qhov kub thiab qhov sov siab, qhov ammonia volatilization ntawm urea tuaj yeem hlawv cov nroj tsuag thiab ua kom nrawm rau nitrification tus nqi. Yog li, nws yog qhov tseem ceeb heev kom thov urea tob thiab siv dej los nqa tshuaj chiv.

3. Vim tias urea tuaj yeem khaws ntau ntawm ammonium ions ntau hauv cov av, nws yuav ua rau muaj pH ntau ntxiv los ntawm 2-3 units. Tsis tas li ntawd, urea nws tus kheej muaj qee qhov nyiaj ntawm biuret. Thaum nws qhov kev kub siab yog 500ppm, nws yuav cuam tshuam cov qoob loo. Cov hauv paus hniav thiab cov hlav muaj cov tshuaj tiv thaiv kab mob, yog li urea tsis yooj yim raug siv los ua noob chiv, yub chiv thiab chiv chiv. Cov ntsiab lus urea nyob rau 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 tov nrog alkaline chiv. Tom qab urea 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 nitrogen hauv ammonium nitrogen yuav ua rau ammonia thiab volatilize. Yog li no, urea tsis tuaj yeem ua ke nrog cog ntoo tshauv, calcium calcium phosphate fertilizer, carbon Sib xyaw lossis sib xyaw ua ke siv cov alkaline chiv xws li ammonium.

Dab tsi yog qhov cuam tshuam ntawm urea ntawm kev cog kev cog ntoo thiab kev siv nws li cas?

1. Lub luag haujlwm ntawm urea yog kho cov paj. 5-6 lub lis piam tom qab tawg paj, tshuaj tsuag 0.5% urea dej daws ntawm cov nplooj ntoos rau 2 zaug, uas tuaj yeem nce cov ntsiab lus nitrogen ntawm cov nplooj, nrawm nrawm kev loj hlob ntawm cov hlav tshiab, inhibit qhov sib txawv ntawm cov paj tawg, thiab ua rau lub xyoo paj kom phim 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 nyog rau siv raws li cov khoom siv chiv thiab hnav khaub ncaws sab saum toj. Feem ntau, nws tsis yog siv los ua noob chiv.

3. Thov siv ua ntej. Tom qab urea siv rau hauv 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. Thov siv urea tom qab los nag ntau li ntau tau kom muaj dej noo zoo nqus kev ua tau zoo. 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 khaws cia tsis raug, nws yuav yooj yim nqus noo noo thiab agglomerate, uas yuav cuam tshuam cov khoom qub zoo ntawm urea thiab coj qee yam kev lag luam poob rau cov neeg ua liaj ua teb. Qhov no xav kom cov neeg ua liaj ua teb yuav khaws urea kom raug. Nco ntsoov khaws cia lub hnab ntim urea kom zoo ua ntej siv, tswj nws nrog kev saib xyuas thaum lub sijhawm kev thauj mus los, zam kev nag, thiab khaws cia rau 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 tias cov zis uas tau qhib rau hauv lub hnab tsis tau siv, yuav tsum qhib lub hnab ntim khoom yuav tsum muab khi rau hauv lub sijhawm kom thiaj li siv tau rau lwm xyoo.