农药的结合残留是指借助常规溶剂不能被抽提的残留农药及其代谢物。它在土壤中形成结合态残留后,脱离了正常的降解、迁移等循环过程,而导致其稳定性和持留性增加。绿麦隆系麦田用除草剂,在江苏稻麦两熟地区使用,曾因其残留而产生对后茬水稻的药害。为阐明其在土壤中的行为归趋,采用核素示踪技术进行了上壤结合残留研究,结果为:(1)~(14)C-绿麦隆在供试土壤中有明显的结合残留,并随时间延长而增加;有机质含量高的黑土,其结合残留物明显高于有机质含量低的水稻土;渍水土壤结合残留明显高于旱地土壤;(2)~(14)C- Residues of pesticides are residual pesticides and their metabolites that can not be extracted by conventional solvents. It forms a bound state in the soil after leaving the normal degradation, migration and other recycling process, resulting in increased stability and retention. Department of green wheat wheat field with herbicides, rice and wheat in Jiangsu two ripening areas, had its residue and produce rice crop injury. In order to elucidate the trend of their behavior in soils, the radionuclide tracing technique was used to study the soil bound residues. The results were as follows: (1) ~ (14) C-chlorotoluron showed obvious binding residues , And increased with time. In black soil with high organic matter content, the combined residues were significantly higher than paddy soil with low organic matter content. The combined residues in waterlogged soil were significantly higher than those in dry land. (2)