对复合肥的施用,必须注意:在因土因作物确定复合肥适宜的施用量、施用期和施肥部位时,除需考虑其所含营养元素的种类、含量和形态外,还需考虑到它们所含氮、五氧化二磷、氧化钾的相对比例。 普通的氮磷钾复合肥(1:1:1),适合施于一般种植经济作物的土壤上,如养分含量为10—10—10的氮磷钾复合肥,作为烟草专用肥效栗良好。 The application of compound fertilizer must pay attention to: when determining the suitable application amount, application period and fertilization site of compound fertilizer due to soil-borne crops, besides taking into account the types, contents and forms of the nutrient elements contained therein, it is also necessary to consider them The nitrogen, phosphorus pentoxide, potassium oxide relative proportions. Common NPK fertilizers (1: 1: 1) are suitable for application to soils commonly grown on cash crops such as NPK fertilizers with a nutrient content of 10-10-10, which are good as tobacco-specific fertilizers.