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在农业生产中,各种作物难免会发生这样或那样的病虫危害。在使用农药进行防治时,经常发现一些农民朋友不按说明书的规定配药,而随意加大药量。结果不但没有达到防治效果,还使庄稼产生了药害,甚至还误认为农药有问题。因此,针对这个问题,笔者认为有必要向农民朋友介绍一些有关农作物产生药害的原因及预防措施方面的知识。一般情况下,低剂量农药对植物生长有刺激作用,高剂量对植物的正常生长起破坏作用。在生产实践中,因使用技术不当,常常会出现因农药影响农作物的正常生长,我们把这种现象称为药害。植物药害按其症状发展的快慢可以分为急性药害和慢性药害两种。急性药害是指在喷药后几小时或几在内出现的药害,主要症状表现为种子发芽率下降;叶片出现斑点(颜色、大小、形状各异),叶片穿孔(药害后出现的斑点变焦脱落),整
In agricultural production, a variety of crops will inevitably occur one way or another pest damage. In the use of pesticides for prevention and control, it is often found that some farmers friends do not dispense pharmaceutical instructions, and arbitrarily increase the dose. The results not only failed to achieve the prevention and control effect, but also caused crop injury and even mistakenly thought pesticide problems. Therefore, in response to this problem, I think it is necessary to introduce to farmers friends some of the causes of crop injury and precautionary measures of knowledge. In general, low-dose pesticides have a stimulating effect on plant growth and high doses have a damaging effect on the normal growth of plants. In the practice of production, due to the improper use of technology, the normal growth of crops due to pesticides often occurs. We call this phenomenon phytotoxicity. Phytotoxicity according to the rapidity of its symptoms can be divided into two kinds of acute injury and chronic injury. Acute phytotoxicity refers to the phytotoxicity that occurs within a few hours or a few hours after spraying. The main symptoms are the decrease of seed germination rate; the appearance of spots (color, size, shape), leaf perforation Spot zoom off), whole