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在农业生产中,农民由于对农药药剂浓度的表示方法缺乏必要的认识,常常遇到许多麻烦,特别是看到“PPm”这个符号更是不知所措。有的农民在不经技术人员指导下,盲目使用,造成极为严重的后果。正确掌握药剂的稀释方法对于提高防治效果,降低成本,减少损失是非常重要的。 通常药剂浓度的表示方法有三种。 一、百分浓度。表示一百份药液(或药剂)中含有药剂有效成份的份数。符号是％。如65％代森锌可湿性粉剂,表示100份药剂中含有65份代森锌
In agricultural production, peasants often encounter many troubles due to the lack of necessary understanding of how pesticide concentrations are expressed. In particular, it is overwhelmed to see the sign of “PPm.” Some peasants blindly use them without the guidance of technical personnel, causing extremely serious consequences. Correctly grasp the dilution method of medicament is very important to improve the prevention and control effect, reduce the cost and reduce the loss. Usually there are three ways to represent the concentration of the drug. First, the percentage concentration. Represents one hundred servings (or medicaments) that contain the active ingredients of the medicament. Symbol is%. Such as 65% dextrins WP, indicates that 65 of the 100 agents contain dexamethasone