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从4个方面讨论如何选用化肥:对不同作物、土壤如何选用不同形态的化肥(如NH4+-N、NO3--N,水溶磷、有效磷、难溶磷,含氯钾、含硫钾等);如何按作物喜素选用化肥;如何按不同施肥方法选用化肥;如何按肥料的有效养分和比价选用化肥。以达到提高作物产量和品质,减少投资,提高经济效益的目的,对农民选用化肥有指导意义。
Discuss how to choose fertilizer from four aspects: How to choose different forms of fertilizers (NH4 + -N, NO3 - N, water soluble phosphorus, available phosphorus, insoluble phosphorus, ; How to use fertilizer for crops hi element; how to choose by different fertilizers fertilizers; how to use fertilizers effective nutrients and price of fertilizer. In order to achieve the purpose of improving crop yield and quality, reducing investment and improving economic efficiency, it is instructive for farmers to use chemical fertilizers.