Urea ndi feteleza wa mbewu yemwe nthawi zambiri amafunika kuthiridwa. Ntchito yake yayikulu ndikuti asasiye chilichonse choyipa m'nthaka, ndipo kugwiritsa ntchito nthawi yayitali kulibe zovuta. M'makampani, ammonia wamadzimadzi ndi carbon dioxide amagwiritsidwa ntchito ngati zopangira kuti apange mwachindunjiurea Pansi pa kutentha kwambiri komanso kuthamanga. Kuphatikiza pa kugwiritsidwa ntchito ngati feteleza wopangidwa ndi mankhwala,urea itha kugwiritsidwanso ntchito pazambiri zamagulu ena azamankhwala, mankhwala, chakudya, zosungunulira utoto, zoyamwa chinyezi, ndi zowonjezera zowonjezera viscose, utomoni womaliza wothandizila, injini ya dizilo yotulutsa mankhwala amadzimadzi ndi zida zina zopangira.

Njira zodzitetezera pakugwiritsa ntchito urea:

1. Urea Ndioyenera feteleza woyambira komanso mavalidwe apamwamba, ndipo nthawi zina ngati feteleza wa mbewu. Ndioyenera mbewu zonse ndi dothi lonse. Itha kugwiritsidwa ntchito ngati feteleza woyambira komanso mavalidwe apamwamba. Itha kugwiritsidwa ntchito m'minda youma paddy. Mu dothi la zamchere kapena zamchere,urea ndi hydrolyzed kuti apange ammonium nitrogen, ndipo kugwiritsa ntchito pamwamba kumapangitsa ammonia volatilization, nthaka yovundikira kwambiri iyenera kugwiritsidwa ntchito.

2. Pambuyo pa urea Amathiridwa pansi pamunda wam paddy, volatilization ya ammonia pambuyo pa hydrolysis ndi 10% -30%. M'nthaka yamchere, kutayika kwa nayitrogeni ndi ammonia volatilization ndi 12% -60%. Pansi pa kutentha kwambiri komanso chinyezi chambiri, ammonia volatilization yaurea Ikhoza kuwotcha zomera ndikufulumizitsa kuchuluka kwa nitrification. Chifukwa chake, ndikofunikira kutsatiraurea mozama ndikugwiritsa ntchito madzi kunyamula feteleza.

3. Chifukwa urea Ikhoza kudziunjikira kuchuluka kwa ayoni wa ammonium m'nthaka, idzawonjezera pH ndi mayunitsi 2-3. Kuphatikiza apo,urea palokha pamakhala kuchuluka kwa biuret. Makulidwe ake akakhala 500ppm, zimakhudza mbewuzo. Mizu ndi ziphuphu zimakhala ndi zotsatira zoletsa, koterourea Sizovuta kugwiritsidwa ntchito ngati feteleza wa mbewu, fetereza mmera ndi feteleza wa masamba. Pulogalamu yaurea Zomwe zili munthawi zina zogwiritsira ntchito siziyenera kukhala zochulukirapo kapena zolimbikira. Mbeu za mmera zikatha kuonongeka ndi biuret, zotchingira kaphatikizidwe ka chlorophyll zimapangidwa, ndipo masamba amawoneka ngati chlorosis, achikasu komanso mikwingwirima yoyera.

4. Urea sizingasakanikirane ndi feteleza wamchere. Pambuyo pakeurea amathiridwa, ayenera kusandulika kukhala wa nitrojeni wa ammonium usanagwiritsidwe ntchito ndi mbewu. Pansi pa zinthu zamchere, ambiri a nayitrogeni mu ammonium nayitrogeni adzakhala ammonia ndikusintha. Chifukwa chake,urea sungaphatikizidwe ndi phulusa lazomera, feteleza wa calcium magnesium phosphate, kaboni Wosakanikirana kapena kugwiritsa ntchito feteleza wamchere monga amoniamu.

Zotsatira za urea pa kukula kwa mbewu ndi momwe mungagwiritsire ntchito?

1. Udindo wa urea ndi kusintha maluwa. Masabata 5-6 mutatha maluwa, perekani 0,5%urea Njira yothetsera madzi patsamba 2, yomwe imatha kuwonjezera nayitrogeni m'masamba, imathandizira kukula kwa mphukira zatsopano, ziletsa kusiyanitsa kwa maluwa, ndikupangitsa kuchuluka kwa maluwa apachaka kukhala koyenera.

2. Ikani mbeu zazikulu patsogolo. Mukamagwiritsa ntchito, mbewu zomwe zili ndi malo okulirapo komanso zopindulitsa kwambiri zachuma (monga tirigu ndi chimanga) ziyenera kuganiziridwa kaye. Kwa mbewu zachiwiri monga buckwheat, mutha kugwiritsa ntchito zochepa poyerekeza ndi momwe mulili pachuma. Kapenanso osazigwiritsa ntchito, ndipo perekani mokwanira kuti feteleza azikulitsa. Gwiritsani ntchito ngati feteleza woyambira kapena mavalidwe apamwamba.Urea ndi yoyenera kugwiritsidwa ntchito ngati feteleza woyambira komanso mavalidwe apamwamba. Nthawi zambiri, sagwiritsidwa ntchito ngati feteleza wa mbewu.

3. Ikani pasadakhale. Pambuyo pakeurea Amagwiritsidwa ntchito m'nthaka, imayambitsidwa hydrolyzed mu ammonium bicarbonate pogwiritsa ntchito tizilombo tanthaka isanalowerere ndi mizu ya mbewu. Chifukwa chake, iyenera kugwiritsidwa ntchito pasadakhale. Ikaniurea Pambuyo pa mvula momwe mungathere kuti mukhale ndi magwiridwe antchito abwino a chinyezi. Mukamagwiritsa ntchito topdressing panthaka youma, yesetsani kukonza pakadutsa mvula kuti fetereza isungunuke mwachangu ndikutengera nthaka.
4. Ngati urea amasungidwa molakwika, imatha kuyamwa chinyezi ndikuphatikizana, zomwe zingakhudze mtundu woyambirira wa urea ndikubweretsa mavuto ena azachuma kwa alimi. Izi zimafuna kuti alimi azisungaurea molondola. Onetsetsani kuti mwasunga fayilo yaurea Chikwama chokwanira musanagwiritse ntchito, chigwireni mosamala mukamayendetsa, pewani mvula, ndikuisunga pamalo ouma, opumira bwino ndi kutentha kotsika madigiri 20.

5. Ngati ndi chosungira chochuluka, gwiritsani ntchito bwalo lamatabwa kuti mulowetse pansi pafupifupi masentimita 20, ndipo siyani malo opitilira 50 cm pakati pa denga ndi denga kuti mpweya uzikhala wabwino komanso chinyezi, ndipo siyani timipata pakati stacks. Kuwongolera kuyendera ndi mpweya wabwino. Ngati fayilo yaurea zomwe zatsegulidwa mthumba sizinagwiritsidwe ntchito, kutsegula kwa thumba kuyenera kusindikizidwa munthawi yake kuti igwiritsidwe ntchito chaka chamawa.