一、怎样鉴别农药药效 购买或贮存农药，在使用之前，应先检查药效，以防药剂失效造成不应有的损失。常用的几种鉴别方法是： （一）乳剂农药 １、观察法。发现农药里有沉淀，或分层絮结现象时，可将药瓶放在热水中低置１小时，若沉淀物分解，絮状消失即说明农药有效，否则，不 First, how to identify the effectiveness of pesticides Purchase or storage of pesticides, before use, you should first check the efficacy, to prevent the ineffective agent caused undue losses. Several commonly used identification methods are: (A) emulsion pesticides 1, observation. Pesticide found in the precipitation, or layered floc phenomenon, the bottle can be placed in hot water low for 1 hour, if the sediment decomposition, the floc disappearance of pesticides that is effective, otherwise, not