山东肥城的读者李建军咨询鉴别农药是否失效的方法,本刊归纳了几种方法予以答复如下:1、直观法:对粉剂农药,先看药剂外表,如果受潮结块,药味不浓或有其它异味,并能用手捏成团,说明已经基本失效;对乳剂农药,先将药瓶倒置,如果药液混浊不清或出现分层(即油水分离),有沉淀物生成或絮状物悬浮,说明 Shandong Feicheng Li Jianjun consult the reader to identify whether the failure of pesticides, the paper summarized several ways to answer the following: 1, intuitive method: powder pesticides, look at the appearance of pharmaceuticals, if damp agglomeration, the drug is not concentrated or have other off-flavor , And can be squeezed into groups by hand, indicating that the basic failure; the emulsion pesticides, the first bottle upside down, if the liquid cloudiness or stratification (ie, oil and water separation), the formation of sediment or floc suspended, Description