化肥品种多,特别是氮、磷、钾化肥,施用后见效快,直观效应明显,增产显著。但近年来,常有不少农民反映,有些品牌的化肥是水货,施用后没有效果,或效果不明显。究其原因,一是有些化肥的有效含量没有达到标准;二是有些化肥中拌有同类别的低含量化肥;三是掺有无肥效的其他杂质。为了 More varieties of fertilizers, especially nitrogen, phosphorus and potassium fertilizers, quick after application, obvious visual effects, yield significant. However, in recent years, many farmers often reflect that some brands of chemical fertilizers are parallel imports, with no effect after application or with insignificant effects. The reason, first, the effective content of some fertilizers did not meet the standards; second, some of the same fertilizer mixed with low levels of fertilizers; third is mixed with other non-fertilizer impurities. in order to