在zai農nong業ye生sheng產chan中zhong
，若ruo一yi旦dan誤wu用yong了le失shi效xiao的de農nong藥yao，輕qing則ze無wu防fang治zhi效xiao果guo，重zhong則ze可ke導dao致zhi作zuo物wu受shou害hai而er造zao成cheng減jian產chan甚shen至zhi絕jue收shou。下xia麵mian向xiang讀du者zhe朋peng友you介jie紹shao幾ji種zhong失shi效xiao農nong藥yao的de辨bian別bie方fang法fa。

幹性粉劑類 此類農藥如外表呈受潮狀態，用手握時能成濕團，為半失效農藥；如結成軟塊
，則全部失效。正常的幹性粉劑農藥應無吸潮結塊現象。

可濕性粉劑類 qushaoxunongyaodaozairongqinei，jiarushiliangdeshuijiangqitiaochenghuzhuang，ranhouzaijiarushaoliangdeqingshuijiaobanjunyun
，jingzhihouguancha。rushiweibianzhidenongyao，qixuanfuxingjiaohao

，fenlidechendiansudujiaoman
，chendianwuyetebieshao。fanzhi，zeweichengdubutongshixiaohuobianzhidenongyao，yingdangshenyong。

乳劑類 在辨別這類農藥時
，可先將藥瓶用力振蕩，靜置1xiaoshizuoyouzaiguancha。ruguochuxianlefencengdexianxiang，zeshuomingnongyaoyijingshixiao。ciwai，haikeyijiangyaopingfangruwenreshuizhong，daixirehouguancha，ruguoshiweibianzhidenongyao，pingneidechendianwujihuimanmandironghua、甚至完全消失；反之
，則為失效農藥。