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The sulfonylurea herbicides have been characterized by broad-spectrum weed control at exceptionally low dosage, good crop selectivity and low-mammalian toxicity.Although they are used in low dosage and low mammalian toxicity, they belong to long residual herbicides.Because of long expiry date in soil and crop, the human and cattle are easily harmed in wrong using.The residual herbicides of the sulfonylureas have been caused by many countries, so strict criterions are adopted.