I-Urea, eyaziwa nangokuthi i-carbamide, yakhiwe ngekhabhoni, i-nitrogen, i-oxygen, i-hydrogen organic compound iyi-crystal emhlophe, njengamanje ingumongo we-nitrogen ophakeme kakhulu womanyolo we-nitrogen. I-Urea iqukethe okuqukethwe okuphezulu kwe-nitrogen, isilinganiso sesicelo akufanele sibe sikhulu kakhulu, ukuze kugwenywe imfucuza engadingekile kanye "nokulimala komanyolo". Abalimi ezindaweni eziningi ezikhiqiza izithelo basebenzisa i-urea eningi, okuholela ezihlahleni ezifile, imiphumela iba mibi kakhulu. Namuhla sizokwethula ukusetshenziswa okufanele kwe-urea.

Sebenzisa i-urea taboo eyishumi 

Kuhlanganiswe ne-ammonium bicarbonate

Ngemuva kokuthi urea efakwe enhlabathini, kufanele iguqulwe ibe yi-ammonia ngaphambi kokuthi imuncwe izitshalo, futhi izinga lokuguqulwa kwayo lihamba kancane ngaphansi kwezimo ze-alkaline kunaphansi kwezimo ze-asidi. Ngemuva kokuthi i-ammonium bicarbonate isetshenziswe emhlabathini, ukuphendula kwaba yi-alkaline, futhi inani le-pH lalingu-8.2 ~ 8.4. Indawo yokulima ihlanganisa i-ammonium bicarboate ne-urea, izokwenza ukuguqulwa kwe-urea ibe yijubane le-ammonia kwehle kakhulu, kube lula ukudala ukulahleka kwe-urea nokulahleka kwe-volatilization. Ngakho-ke, i-urea ne-ammonium bicarbonate akufanele isetshenziswe ngokuhlangana noma ngasikhathi sinye. 

Gwema ukusakazwa komhlaba

I-Urea isakazeka phansi futhi ingasetshenziswa kuphela ngemuva kwezinsuku ezingama-4-5 zokuguqulwa ekamelweni lokushisa. Iningi le-nitrogen lithambeka kalula enqubekweni yokwengeza, futhi isilinganiso sokusetshenziswa sangempela simayelana nama-30% kuphela. Uma isakazeka enhlabathini ene-alkaline nenhlabathi enokuqukethwe okuphezulu kwezinto eziphilayo, ukulahleka kwe-nitrogen kuzoshesha nokuningi. Futhi urea application engajulile, okulula ukudliwa ukhula. I-Urea isetshenziswa ijule futhi incibilikise inhlabathi ukuze umanyolo ungaphakathi ungqimba lwenhlabathi olumanzi, oluzuzise umphumela womanyolo. Ukugqokwa ngaphezulu kufanele kwenziwe eceleni kwesithombo esinemigodi noma imisele, futhi ukujula kufanele kube cishe u-10-15cm. Ngale ndlela, i-urea igxile kungqimba oluminyene lohlelo lwempande, olusiza ukumuncwa nokusetshenziswa kwezitshalo. Ukuhlolwa kukhombisile ukuthi isilinganiso sokusetshenziswa kwe-urea singakhuphuka ngo-10% ~ 30%.

Ezintathu aziwutshali umanyolo

I-Urea enqubweni yokukhiqiza, ivame ukukhiqiza inani elincane le-biuret, lapho okuqukethwe kwe-biuret okungaphezu kuka-2% kuzoba yingozi ezimbewini nasezihlwanyelweni, okufana ne-urea kube yimbewu nezithombo, kuzokwenza ukukhishwa kwamaprotheni, kuthinte ukuhluma nokukhula kwezithombo imbewu, ngakho-ke ayifanele ukutshala umanyolo. Uma kufanele isetshenziswe njengomanyolo wembewu, gwema ukuxhumana phakathi kwembewu nomanyolo bese ulawula umthamo.

Abane bagweme ngokushesha ngemuva kokuniselwa

I-Urea ngeye-amide nitrogen fertilizer, edinga ukuguqulwa ibe yi-ammonia nitrogen ukuze imuncwe futhi isetshenziswe uhlelo lwezimpande zezitshalo. Ngenxa yekhwalithi ehlukile yenhlabathi, amanzi nezimo zokushisa, inqubo yokuguqula ithatha isikhathi eside noma isikhathi esifushane. Ngokuvamile, ingaqedwa ngemuva kwezinsuku ezi-2 ~ 10. Ngokuvamile, ukuchelela kufanele kwenziwe ezinsukwini ezi-2 ~ 3 ngemuva kokufakwa ehlobo nasekwindla, nezinsuku eziyi-7 ~ 8 ngemuva kokufaka isicelo ebusika nasentwasahlobo.