论文部分内容阅读
目前,蔬菜受毒质污染日趋严重,叶菜类常有苦涩味,还发现有人、畜中毒现象.因此,生产无公害蔬菜是关系到人民的生活和身体健康的大事,也是人们的迫切要求.造成蔬菜毒质污染的因素有:(1)农药污染.由于病虫抗病性的产生,使用农药浓度的不断增加.如防治菜好,1968年用40%乐果1:4000倍喷洒就能达到防治效果,而到1980年则须用40%乐果1:500倍才能见效.农药浓度提高了,而蔬菜采收上市时间不
At present, vegetables are becoming more and more contaminated with poisonous substances, leafy vegetables often have bitter astringency, and some people and livestock poisoning are found out. Therefore, the production of pollution-free vegetables is an important event that concerns the people’s life and health. It is also an urgent demand of people. The factors that cause the poisoning of vegetables are as follows: (1) Pesticide pollution. Due to the emergence of pest and disease resistance, the concentration of pesticides used is constantly increasing. If it is good for prevention and cure, it can be sprayed with 40% dimethoate at 1: 4000 times in 1968 Achieve the control effect, but by 1980, 40% dimethoate should be used 1: 500 times to be effective.Pesticide concentration increased, and vegetable harvest time to market not