合理施肥在农业生产上具有重大意义。合理施肥必须根据四看原则来进行,即看天(气候)看地(土壤)、看作物,看肥料,这里着重介绍怎样因土施肥。 (一)土壤养分状况与施肥不同的土壤其肥力有高有低,熟化程度也不相同,氮、磷、钾等养分含量存在较大的差异,有 Rational fertilization in agricultural production is of great significance. Reasonable fertilization must be based on the principle of four-look, that is, to see the weather (climate) to see (soil), see crops, see fertilizer, here focuses on how to fertilize the soil. (A) soil nutrients and fertilizers different soil fertility is high and low, the degree of maturation is not the same, nitrogen, phosphorus and potassium nutrient content there is a big difference, there are