40年代化肥和化学合成农药兴起后,人们过多的寄托于化肥和农药,忽略了生物防治工作。当前延边地区绝大部分水稻田,由于多年来有机肥施用量很少,而单纯增施氮素化肥,使土壤硬化,肥力趋于下降。为消灭稻田杂草,使用多种化学除草剂,造成环境污染,破坏了生态平衡,对农业生产产生新的危害。我们通过几年的试验表明,稻田养萍可增加土壤的营养物质和抑制稻田杂草,也是防治环境污染的有效办法。一、养萍对稻田土壤的影响根据珲春县镇郊公社英子大队第二生产队稻田养萍的调 After the rise of chemical fertilizers and synthetic pesticides in the 1940s, people placed too much on fertilizers and pesticides, ignoring the work of biological control. In the vast majority of paddy fields in Yanbian, due to the small amount of organic fertilizer applied over the years, simply adding nitrogenous fertilizers hardens the soil and the fertility tends to decline. In order to eliminate weeds in rice fields, a variety of chemical herbicides are used, causing environmental pollution, destroying the ecological balance and creating new hazards to agricultural production. Through several years of experiments, we have shown that rice paddies can increase soil nutrients and inhibit paddy weeds, but also an effective way to prevent and control environmental pollution. First, the effect of Yang Ping on paddy soil According to the adjustment of the paddy field Yangping Ping