砜嘧磺隆在土壤中的残留期较长,容易使后茬作物产生药害。采用盆栽试验方法,研究砜嘧磺隆土壤残留致烟草的药害症状并测定其致害临界值。结果表明:经不同浓度砜嘧磺隆处理土壤后,烟株均受到不同程度的影响,药害症状明显,烟株矮小,烟叶黄化,生长受到严重抑制;砜嘧磺隆致害临界值为:0.0083mg/kg The long residual period of the sulfasulfuron in soil can easily cause phytotoxicity in the following crop. Pot experiments were conducted to study the phytotoxicity of residual residues of sulfasulfuron in tobacco soil and the critical value of its toxicity. The results showed that the tobacco plants were affected to varying degrees by different concentrations of the sulfasulfuron, the symptoms were obvious, the tobacco plants were short, the tobacco leaves were yellowing and the growth was severely inhibited. The critical value of the damage of the sulfasulfuron was : 0.0083 mg / kg