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一、有效低浓度的由来与作用。所谓有效低浓度,一般是指在48小时之内,防治病虫害的效果达85～95%上下,把损失控制在经济允许水平以下,使农药的不良影响降低到最低限度的农药浓度或用量,叫有效低浓度。我县自1976年开始试验推广有效低浓度以来,已取得显著效果:1.节约农药,降低成本。1977年全县45个公社得到推广应用,使用面积约占总面积的20%,防治面积达82.5万亩次,大大地节省了农药。据塘甸、仁舍等公社19个大队16,378亩水田统计,由于全面使用有
First, the origin and role of effective low concentration. The so-called effective low concentration, generally refers to within 48 hours, the effect of pest control reached 85 ~ 95% up and down, the loss of control in the economic allowable level below, to reduce the adverse effects of pesticides to a minimum pesticide concentration or dosage, called Effectively low concentration. Since 1976, our county has experimented on the promotion of effective low concentrations and has achieved remarkable results: 1. To save pesticides and reduce costs. In 1977, 45 communes in the county were popularized and applied, covering an area of about 20% of the total area and preventing and controlling an area of 825,000 mu, greatly saving pesticides. According to Tang Dian, Ren She commune 19 brigade 16,378 acres paddy field statistics, due to the full use of