Tsis ntev los no, tus nqi ntawm cov khoom siv nitrogen, phosphorus thiab potassium raw khoom tau nce, txawm hais tias kev lag luam urea tau hloov pauv me ntsis ntawm tus nqi nruab nrab, tab sis tau tsav los ntawm cov ntawv luam thoob ntiaj teb, cov qauv tau rov pib dua. Nyob rau hauv cov nqe lus ntawm potash chiv, poov tshuaj chloride kuj rov ...
Nyeem ntxiv