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(续第6期第28页)农药是由两种或两种以上的物质,在一定条件下发生化学反应而合成的化学品。农药会受外界光、热、湿度等自然因素的影响,使原有性能发生变化,甚至变质失效。农药有效期是指农药产品在规定的贮藏条件下质量能够符合规定要求的期限,通常是指产品自工厂生产包装之日到没有降质、降效的最后日期的这段时期,也叫保质期。在保质期内,农药产品质量不能低于质量标准规定的各项技术指标值,使用者按农药标签上的防治对象、施用方法、使用浓度(或剂量)等各项规定应用,应能达到满
(Continued on page 6, p. 28) Pesticides are chemicals synthesized by chemical reaction of two or more substances under certain conditions. Pesticides will be affected by natural light, heat, humidity and other natural factors, so that the original performance changes, or even deterioration of the failure. Pesticide validity is defined as the quality of pesticide products in the storage conditions to meet the requirements of the deadline, usually refers to the product packaging from the factory date to no degradation, the last date of this period, also known as shelf life. Within the warranty period, the quality of pesticide products can not be lower than the quality standards for the technical indicators, the user according to the pesticide label control object, application method, the use of concentration (or dose) and other provisions of the application should be able to reach full