论文部分内容阅读
农药的利弊保护作物免受病虫害及杂草侵害是粮食增产的一个重要措施,把受到理想的病虫害防治和不进行防治比较,产量相差50％左右。农药作为植物保护技术的中心环节,除起到直接防治有害生物的效果外,还能使以前由于病虫害经常发生而不能很好采用的多肥栽培、高产品种等措施得到推广。这种间接效果意义也很大,假使木材的寿命从10年延长到50年,那
Advantages and Disadvantages of Pesticides Protecting crops from pests and weeds is an important measure to increase grain output. Compared with preventing and controlling ideal pests and diseases, the yield difference is about 50%. As a central part of plant protection technology, pesticides can not only directly control pests, but also popularize measures such as multi-fertilizer cultivation and high-yielding varieties, which were not well used due to the frequent occurrence of pests and diseases. This indirect effect is also very significant, if the life expectancy of wood from 10 years to 50 years, that