一看包装。化肥的包装袋上一般都注明肥料名称,生产厂家,产品净重和标准号,肥料质量、氮、磷、钾含量及加入微量元素含量。二看生产日期。产品包装上注明出厂日期,质量说明书,包装整齐度,形状、气味等。三看吸水性。氮肥,硝酸铵、碳酸氢氨容易吸湿性强,且易结块,而氯化钾、硫酸 A look at the packaging. Fertilizer bags generally indicate the name of fertilizer, manufacturer, product weight and standard number, fertilizer quality, nitrogen, phosphorus and potassium content and the content of trace elements added. Second look at the production date. Product packaging, indicating the date of manufacture, quality manual, packaging uniformity, shape, smell and so on. Third, look at water absorption. Nitrogen fertilizers, ammonium nitrate, ammonium bicarbonate are highly hygroscopic and easily agglomerated, while potassium chloride, sulfuric acid