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 residue of rimsulfuron remains in the soil for a long time after the herbicide is used to control weeds in the corn and sorghum fields. It is common to observe tobacco phytotoxicity if the tobacco plants are cultivated as succession crop in the same fields because tobacco plants are sensitive to herbicides. The symp-toms of tobacco phytotoxicity caused by rimsulfuron were studied using pot experiments and the critical con-centration threshold was determined. The results showed that the growth of tobacco was inhibited in varying degrees by soil residual rimsulfuron from different concentration treatments. The symptoms of tobacco phyto-toxicity were obvious:plant smaller, leaf yellowing and growth seriously inhibited. The critical concentration threshold causing tobacco phytotoxiciy by rimsulfuron was determined as 0. 0083mg/kg.
展开▼
