磷二铵是一种含氮18％、含五氧化二磷46％的二元复合肥,它的性质和其它常用肥料有很大不同。所以,要用好它,就得必须注意以下几点:1、磷二铵中含磷多而含氮少,应优先施用于缺磷土壤和豆类、油菜、荞麦、玉米等喜磷作物上。2、磷二铵中氮、磷比例固定,不适合作物营养的需要,因此必须配合施用单质氮肥。肥料用量由磷素确定,不足的氮素由单质氮肥补充。 Phosphorus diammonium is a binary compound fertilizer containing 18% nitrogen and 46% phosphorus pentoxide. Its properties are very different from those of other commonly used fertilizers. Therefore, to make good use of it, we must pay attention to the following points: 1. Phosphorus diammonium contains more phosphorus and less nitrogen. It should be applied preferentially to phosphorus-deficient soils and phosphorus-like crops such as beans, rape, buckwheat and corn . 2, phosphorus and diammonium nitrogen, phosphorus fixed, not suitable for crop nutrition needs, it must cooperate with the application of elemental nitrogen. The amount of fertilizer determined by the phosphorus, nitrogen deficiency by elemental nitrogen supplement.