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一、农药药害的种类 1、急性药害:指在喷药后短期内很快发生的药害,其症状表现比较明显。一般在植株叶部出现斑点、穿孔、焦灼、失绿及落叶等症状,重者可导致整个植株枯死。拌种剂和十壤处理剂会导致种子发芽率低、发芽畸形、发根不良和延迟发芽等症状。 2、慢性药害:这是指在喷药后经过较长时间缓慢地表现出来的药害。这种药害常常由于作物的生理代谢过程受到影响,植物的生育受到不良的干扰,产生筒状叶、植株矮化、结实率降低等症状,最终使作物的产量和质量降低。 3、残留药害:有些农药在土壤中的消解半衰期较长,就可能在农田中积累,长期使用这类农药,土壤中积累不断增多,当积累到一定数量时,便会对作物产生药害,这就是残留药害。
First, the type of pesticide injury 1, acute injury: refers to the rapid short-term spraying after the injury, the symptoms more obvious. Generally appear in the plant leaves spots, perforation, anxiety, loss of green and leaves and other symptoms, severe cases can lead to the entire plant dead. Seed dressing and soil treatment will result in 10 seed germination rate is low, germination malformations, hair root defects and delayed germination and other symptoms. 2, chronic phytotoxicity: This refers to the spray after a long period of time to show the injury. Such phytotoxicity is often affected by the physiological metabolic processes of the crop, the plants are adversely affected in their reproductive development, produce tubular leaves, dwarf plants, reduced seed setting and other symptoms, eventually resulting in reduced yield and quality of the crop. 3, residual phytotoxicity: Some pesticides in the soil digestion half-life longer, it may accumulate in the farmland, long-term use of such pesticides, the accumulation of soil increased, when accumulated to a certain amount, it will have crop injury This is the residual injury.