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在植物保护中,化学防治占有重要地位。特别是自有机杀虫剂,杀菌剂问世以来,给植物保护工作带来了巨大的变化。由于有机杀虫剂、杀菌剂的广泛使用,把病虫害的防治工作提高到了一个新的水平,为农业增产创造了有利条件。据报导,日本稻田施用农药的增产价值约为药械投资的4.8—8.4倍;美国农业生产中,每一元农药投资的增产价值为5—8元。但是事物是一分为
In plant protection, chemical control occupies an important position. Especially since the advent of organic pesticides and bactericides, great changes have taken place in plant protection. Due to the extensive use of organic insecticides and bactericides, the prevention and control of pests and diseases has been raised to a new level, which has created favorable conditions for increasing agricultural output. It has been reported that the increase of the value of pesticides applied to paddy fields in Japan is about 4.8-8.4 times that of investment in drug-armaments. In the U.S. agricultural production, the value-added of each yuan of pesticides invested is 5-8 yuan. But things are divided