一、粉剂农药:当粉剂农药已结块时,说明受潮严重,可能分解失效。可用两种方法加以鉴别。第一,取约50克农药用适量肥皂水调成糊状,再加清水搅匀放置,若悬浮均匀,下沉速度慢,半小时后杯底无沉淀或沉淀很少,证明未失效。第二,取小量农药放在铁片上,再放在火上烧,如果冒白烟,证明未失效,否则为失效农药。 二、可湿性粉剂农药:这类农药可从湿润性和悬浮率两方面鉴别。第一,湿润性:取清 First, the powder pesticides: When powder pesticides have agglomerated, indicating a serious dampness, decomposition may fail. Available in two ways to identify. First, take about 50 grams of pesticides with a suitable amount of soapy water into a paste, add water and stir well placed, if the suspension uniform, slow sinking, half an hour after the cup was no precipitate or precipitation is small, proved no failure. Second, take a small amount of pesticides on the iron piece, and then put on the fire on the burn, if you take white smoke, that did not fail, otherwise it is invalid pesticides. Second, wettable powder pesticides: Such pesticides from the wettability and suspension rate in two aspects of identification. First, wettability: clear