科学施肥是提高作物产量，改善品质，降低生产成本的重要因素。但目前普遍存在盲目施肥、单一施肥、过量施肥等不合理的施肥现象，不仅降低了肥料利用率，增加了生产成本，而且破坏土壤结构，导致土壤退化，造成作物大幅度减产，产品品质下降，给生产带来损失。当前，以下主要? Scientific fertilization is an important factor to improve crop yield, improve quality and reduce production costs. However, irrational fertilization such as blindly fertilization, single fertilization and excessive fertilization are widespread at present, which not only reduces the fertilizer utilization rate and increases the production cost but also destroys the soil structure, causes the soil to degenerate, causes the crop to reduce production drastically, and reduces the product quality. To produce loss. Currently, the following main?