农药都有一种符号来表示水剂、粉剂、浓度以及在水中和油中的乳液、乳剂、密度、重量、毒性等等。目前,有不少农民朋友都不认识农药包装上所表示的符号代表什么,为了使广大农民使用方便,分别介绍一下,供使用农药时参考。 Pesticides have a symbol for liquid formulations, powders, concentrations and emulsions, emulsions, densities, weights, toxicities and the like in water and in oil. At present, many farmers and friends do not know what the symbol on the packaging of pesticides represents. In order to make the farmers convenient to use, they are introduced respectively for reference when pesticides are used.