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一、复合肥不能单独使用。施用复合肥要根据不同土壤、不同作物、不同时期对各种养分的需求,与其它化肥配合使用。如磷铵二铵含五氧化二磷46％,用于需氮较多的作物时,应当按磷计算用量,不足氮素可用尿素、硫铵来补充。 二、含氮复合肥豆科作物不宜多施。大豆等根部的根瘤菌有固氮作用,过多施用含氮复合肥,不仅造成浪费,还会抑制根瘤菌活动,降低固氮能力。
First, the compound fertilizer can not be used alone. The application of compound fertilizer according to different soil, different crops, different periods of various nutrients, with other fertilizers used in conjunction. Such as ammonium phosphate diammonium phosphorus pentoxide 46%, for more nitrogen crops, it should be calculated by the amount of phosphorus, nitrogen can be used less urea, ammonium sulfate to supplement. Second, nitrogenous fertilizer leguminous crops should not be applied. Rhizobium and other roots of soybean nitrogen fixation, excessive use of nitrogenous fertilizer, not only caused by waste, but also inhibit Rhizobium activity, reduce nitrogen fixation capacity.