实践证明,化肥对农作物具有大幅度提高产量的功效。但有的农民朋友为追求高产盲目加大施肥量,而且化肥越施越多,导致土壤污染加重,产量却难再提高,这是为什么呢?1.化肥利用率低的主要原因一是长期大量施用化肥,土壤酸化程度加剧、有害重金属超标,从而制约了氮磷钾及微量元素的吸收利用。二是不合理的施肥习惯,如一次性大量施 Practice has proved that fertilizers have the effect of greatly increasing the yield of crops. However, some peasants and friends blindly increase the amount of fertilizer for the pursuit of high yield, and the more fertilizer applied more and more, leading to increased soil pollution, yield is difficult to increase, why? 1. The main reason for the low fertilizer utilization rate is a large number of long-term Fertilizer application, aggravated soil acidification, harmful heavy metals exceeded, thus restricting the absorption of N, P, K and trace elements. Second, unreasonable fertilization practices, such as a large number of facilities once