怎样检验农药是否失效灼烧法：用于粉剂农药。先取适量粉剂农药放在金属物上，然后在火上灼烧，如果出现白烟，说明没失效。兑现法：用于粉剂，可湿性粉剂和乳剂农药。对粉剂可取５０克药，放在玻璃瓶里，加一定量清水，稍加搅动，３０分钟后如颗粒悬浮均匀，瓶底无沉淀，... How to check whether the pesticide burns out: For powder pesticides. First take the appropriate amount of powder pesticide on the metal, and then burn it on the fire. If white smoke appears, it means no failure. Cashing method: used in powders, wettable powders and emulsion pesticides. For the powder may take 50 grams of medicine, placed in a glass bottle, add a certain amount of water, stir a little, after 30 minutes if the particles are suspended evenly, no sediment at the bottom of the bottle,...