混合土农药“705”等的推广和使用,迄今已有六年。在这六年中,制造数量一年比一年多,使用面积一年比一年广。总的来说,它是比较受到各地贫下中农欢迎的。它的优点大致是:原料较易获得,制作较简单,成本较低,对化学农药有增效作用,因而在单位面积内可适当减少用药量;使用比较安全,在农作物上残毒较少,并有根外追肥作用;对延缓害虫抗 So far, six years have passed since the promotion and use of “705”, a mixed pesticide. In these six years, the number of manufacturing is more than one year and the area of ​​use is wider than one year. In general, it is more welcomed by the poor, lower-middle peasants all over the country. Its advantages are roughly: easier to obtain raw materials, easier production, lower cost, synergistic effect on chemical pesticides, which can be appropriate to reduce the dosage per unit area; the use of relatively safe, less residue on the crops and There is root top dressing effect; to delay pest resistance