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Urea
Lemandou urea wokhala ndi nayitrogeni 46%, ndi mankhwala olimba a nayitrogeni. Manyowa a Urea amagwiritsidwa ntchito kwambiri muulimi. Ndiwo mtundu wofala kwambiri wa feteleza wa nayitrogeni womwe umagwiritsidwa ntchito padziko lonse lapansi. Amaonedwa kuti ndi gwero lazachuma la nayitrogeni. Wopangidwa kuchokera ku ammonia ndi kaboni dayokisaidi, uli ndi nayitrogeni wambiri kuposa feteleza wolimba wa nayitrogeni. Monga chogwirira ntchito, urea itha kugwiritsidwa ntchito mwachindunji m'nthaka pogwiritsa ntchito zida zofalikira. Kuphatikiza pa kugwiritsa ntchito nthaka, feteleza wa urea atha kugwiritsidwanso ntchito pakupanga feteleza kapena ngati foliar application. Komabe, feteleza wa urea sayenera kugwiritsidwa ntchito munthawi yocheperako, chifukwa urea imatuluka mchidebe nthawi yomweyo.
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Ammonium Sulphate
Manyowa abwino a nayitrogeni (omwe amadziwika kuti fetereza m'munda wa ufa) ndioyenera nthaka komanso mbewu. Zitha kupangitsa nthambi ndi masamba kukula mwamphamvu, kusintha zipatso ndi zipatso, ndikuthandizira kulimbana ndi masoka pakagwa masoka. Itha kugwiritsidwa ntchito ngati feteleza woyambira, feteleza wopota komanso feteleza wa mbewu.
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Mankhwala enaake a Sulphate
MagnesiumSulphate imatha kupereka michere yochuluka pazomera zomwe zimathandizira kukulitsa mbewu ndikuwonjezera kutulutsa, zimathandizanso kumasula nthaka ndikusintha nthaka.
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Potaziyamu Sulphate
Potaziyamu sulphate ndi mchere wosakaniza ndi mankhwala a K chemical so ₄. Nthawi zambiri, zomwe zili mu K ndi 50% - 52%, ndipo zomwe zili mu S zili pafupifupi 18%. Sulphate yoyera ya potaziyamu ndiyopanda khungu, ndipo mawonekedwe a potaziyamu sulphate amakhala achikaso mopepuka. Potaziyamu sulphate ndi potaziyamu wabwino wosungunuka ndi potaziyamu chifukwa chotsika kwambiri, kutsika kochepa, mawonekedwe abwino komanso kugwiritsa ntchito bwino. Potaziyamu sulphate makamaka oyenera mbewu zachuma, monga fodya, mphesa, shuga beet, tiyi chomera, mbatata, fulakesi ndi mitengo ya zipatso zosiyanasiyana. Ndizomwe zimapangidwanso popanga feteleza wopanda chlorine, fosforasi, potaziyamu wa potaziyamu. Potaziyamu sulphate ndi mankhwala osalowerera ndale, feteleza wa asidi, omwe ali oyenera nthaka zosiyanasiyana (kupatula nthaka yodzaza madzi) ndi mbewu. Pambuyo pothira dothi, ion ya potaziyamu imatha kulowetsedwa mwachindunji ndi mbewu kapena kuyamwa ndi nthaka colloids. Zotsatira zake zidawonetsa kuti potaziyamu sulphate itha kugwiritsidwa ntchito ku mbewu za Cruciferae ndi mbewu zina zomwe zimafunikira sulfure wambiri panthaka yoperewera sulfa.
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Nthaka Sulphate
Itha kugwiritsidwa ntchito kupewa matenda a nazale ya mitengo yazipatso, komanso ndi feteleza wamba wothandizira feteleza wa nthaka wofufuza feteleza. Itha kugwiritsidwa ntchito ngati fetereza wapansi, fetereza wapamtunda, ndi zina zambiri. [6] Zinc ndi chimodzi mwazinthu zofunikira kuzipangizo za mbeu. Mbande zamaluwa zoyera ndizosavuta kuoneka chimanga chifukwa chakuchepa kwa zinc. Pakakhala vuto la zinc, mbande zimasiya kukula kapena kufa. Makamaka nthaka kapena mchenga wina wamchenga wokhala ndi pH yokwanira, feteleza wa zinc monga zinc sulphate ayenera kugwiritsidwa ntchito. Kuwonjezeka kwa feteleza wa zinc kumathandizanso kuti zokolola zichulukane. Njira yobereketsa: tengani feteleza wa zinc 0,04 ~ 0,06 kg, madzi 1 kg, kuvala mbewu 10 kg, pitirizani maola 2 ~ 3 mukubzala. Asanafese, feteleza wa zinc adagwiritsidwa ntchito pazitsulo za rhizosphere ndi 0.75-1kg / mu. Ngati tsamba limawala pang'ono pang'ono mmera, feteleza wa zinc amatha kupopera ndi 0.1kg / mu
