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残留药害是指由长残留性除草剂对后茬敏感作物造成的药害,能够对后茬作物造成药害的除草剂叫长残留除草剂。长残留除草剂一般都是高活性的或是超高活性的除草剂,最突出的优点是活性极高、用药量少、用药成本低、使用方便、除草效果好;它们的共同缺点是在土壤中残留时间长,一般达2～3年,甚至长达4年以上,在土壤中残留的少量或极少量的药剂
Remaining phytotoxicity refers to the long-residual herbicides that cause phytotoxicity to the sensitive crop of the following crop, and the herbicides that can cause phytotoxicity to the following crop are called long-residual herbicides. Long residual herbicides are generally highly active or highly active herbicides, the most prominent advantages of high activity, low dosage, low cost of medication, easy to use, good weeding effect; their common shortcomings in the soil In the residue a long time, usually up to 2 to 3 years, or even up to 4 years or more, in the soil residues of small or very small amount of agents