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在购买或使用化学农药时,要先对农药质量进行必要的鉴别,如果购买或使用了已经失效的农药,不仅直接造成经济损失,而且很容易发生药害。常用的鉴别方法有:1,直观法对粉剂农药,先看药剂外表,如果已经明显受潮结块,药味不浓或有其它异味,并能用手搓成团,说明已经基本失效;对乳剂农药,先将药瓶静置,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,说明药剂可能已经失效。2.加热法适用于粉剂农药。取农药5～10
In the purchase or use of chemical pesticides, the quality of pesticides must first make the necessary identification, if the purchase or use of pesticides has failed, not only directly cause economic losses, but also prone to injury. Commonly used identification methods are: 1, the visual method of powder pesticides, look at the appearance of pharmaceuticals, if it has been damp agglomeration, drug concentration is not strong or have other peculiar smell, and can be hand rub into a group, indicating that the basic failure; emulsion pesticides , The first vial set aside, if the liquid opacity or delamination (ie, oil and water separation), the formation of sediment or floc suspended, indicating that the agent may have expired. 2. Heating method for powder pesticides. Take pesticides 5 to 10