在农作物增产的诸多因素中,施用化学肥料的增产作用要占30～60%。随着农业生产水平的提高和化肥用量的日益增加,不少地方不同程度地出现了盲目施用化肥的问题。如氮肥过量施用,氮磷比例不协调;有机无机肥不能合理搭配,导致施肥效益下降;有的甚至出现高投入低收入现象。科学施 In many aspects of crop yield increase, the application of chemical fertilizers to increase production accounted for 30 to 60%. With the improvement of agricultural production and the increasing use of chemical fertilizers, blind use of chemical fertilizers has appeared in many places to varying degrees. Such as excessive nitrogen fertilizer, nitrogen and phosphorus ratio is not coordinated; organic and inorganic fertilizers can not be a reasonable match, resulting in decreased fertilizer efficiency; and some even high-income low-income phenomenon. Scientific facilities