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防治病虫草害,除了微量喷雾剂和粉剂外,多数农药(可湿性粉剂、乳油、水剂等)都要稀释成一定浓度才能应用。稀释后的浓度过低不能发挥药效,过高会产生药害。因此,要求施药人员必须掌握农药稀释的计算方法。一、农药浓度的表示方法农药中起药效作用的只是其中的有效成分,各种制剂所标明的百分数就是有效成分含量,如50％敌敌畏乳油,表示1斤乳油中含敌敌畏有效成分0.5斤。农药稀释成多大浓度,或者计算每亩有效成分用量,都要以农药的有效成分含量为基础。常见的药剂浓度表示方法有三种。1.重量百分比浓度:表示100份药液(或药粉)中含农药有效成分的份数。如0.05％乐果乳油稀释液,表示100斤药液中含乐果有效成分0.05斤。
Pest and disease control pest control, in addition to trace sprays and powders, the majority of pesticides (WP, EC, water, etc.) must be diluted to a certain concentration can be applied. Dilution of the concentration is too low can not play a role, too high will produce injury. Therefore, the application of pesticide personnel must master the calculation of dilution of pesticides. First, the expression of pesticide concentration Pesticide play a role in the effectiveness of only one of the active ingredients, the percentage of the various preparations is the active ingredient content, such as 50% dichlorvos EC, said 1 kg of EC containing active ingredients dichlorvos 0.5 kg. Pesticides diluted into much concentration, or calculate the amount of active ingredients per acre, should be based on the active ingredient content of pesticides. Common means that the concentration of three methods. 1. Weight Percent Concentration: Indicates the number of pesticide active ingredients in 100 batches (or powders). Such as 0.05% dimethoate dilution, said 100 pounds of liquid active ingredients containing dimethoate 0.05 kg.