复合肥是指在一种化肥中,含有氮、磷、钾三要素中两种和两种以上的肥料。含有任何两种要素的复混合料称二元复合肥;同时含有三要素的肥料称为三元复合肥。选购优质复合肥需做到以下几点:一、坚持“三看”1、看复合肥的外观包装根据国家标准GB8569-1997GB18382-2001的有关规定,复合肥料的包装应是外编织袋内衬聚乙烯薄膜袋,外包装上印有明确、清晰的肥料 Fertilizer refers to a fertilizer containing nitrogen, phosphorus and potassium three elements of two and two or more kinds of fertilizer. Compounded mixture containing any two elements called binary compound fertilizer; also contains three elements of fertilizer called ternary compound fertilizer. Buy high-quality compound fertilizer to do the following: First, adhere to the “three see” 1, look at the appearance of fertilizer packaging According to the national standard GB8569-1997GB18382-2001 the relevant provisions of the compound fertilizer packaging should be outside the woven bag Lined with polyethylene film bag, printed on the packaging clear, clear fertilizer