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通常情况下,使用除草剂产生药害的原因有:误用或错用、施药设备受到污染、雾滴挥发与漂移、土壤残留对后茬作物影响、混用不当、除草剂降解产生有毒物质,异常不良环境等等。以最常用的使用范围最广的磺酰脲类除草剂为例,其对杂草有较高活性,可用于农田、林地及非耕地等防除杂草。但此类除草剂属于长残留性除草剂,使用后在土壤残留时间较长,即使有微量残留也易造成后茬敏感作物药害。磺酰脲类长残留性除草剂品种如氯磺隆、甲磺隆、胺苯磺隆、氯嘧磺隆、单嘧磺隆
In general, the use of herbicides to produce phytotoxicity are due to misuse or misuse, contamination of pesticide application equipment, volatilization and drifting of droplets, effects of soil residues on subsequent crop production, improper mixing, degradation of herbicides to produce toxic substances, Abnormally bad environment and so on. For example, the most commonly used sulfonylurea herbicide has high activity on weeds and can be used for controlling weeds in farmland, woodland and non-cultivated land. However, such herbicides are long-lasting herbicides. After being used, they stay in the soil for a long time, and even trace residues can easily cause the crop injury after the sensitive crop. Sulfonylurea long residual herbicide varieties such as chlorsulfuron, metsulfuron, triasulfuron, chlorimuron-ethyl, monosulfuron-methyl