(二)有机氮杀虫剂在介绍有机氮类杀虫剂之前,先介绍一下这类农药常常使用的剂型(乳油已在前面做过说明): 首先谈一下粉剂,粉剂一般含有0.5～10％的有效成份,也有高含量粉剂如20％西维因。粉剂颗粒的形状和比重,影响其可被风吹走的量,在贮存和运输过程中也可发生分解。施用粉剂要利用早晨平静的气候条件(风速小于4千米/小时),而且这时有露水存在,可以改进粉粒的沉积。粉粒在潮湿气候条件下易于结成 (B) of organic nitrogen pesticides Before introducing organic nitrogen insecticides, first introduce the type of pesticide often used (EC has been described earlier): First, talk about the powder, powder usually contains 0.5 to 10% The active ingredient, there are high levels of powder such as 20% The shape and specific gravity of the powder particles affect the amount of dust that can be blown away and can also decompose during storage and shipping. The use of powder to take advantage of morning calm climate conditions (wind speed less than 4 km / h), and then there is dew, can improve the deposition of particles. Particles are easy to form in humid climates