中国烟草科学2023，Vol.44Issue(6)：29-35,7.DOI:10.13496/j.issn.1007-5119.2023.06.005
不同质地土壤中烟嘧磺隆降解特征与烟草致害阈值研究
Degradation Characteristics of Nicosulfuron and Its Damage Threshold of Tobacco in Different Texture Soils
摘要
Abstract
To clarify the damage threshold of tobacco and safety interval of nicosulfuron in different texture soils,and to provide a theoretical basis for the reasonable and safe use of herbicides in the previous crop of tobacco,field experiments were conducted on typical sandy loam soil and clay loam soil to study the degradation characteristics of nicosulfuron,pesticide damage threshold of tobacco,safety interval and the effects on soil properties in Bijie tobacco-planting areas.The results showed that the half-life of nicosulfuron degradation in sandy loam was 9.5-14.7 d,and in clay loam was 9.0-17.3 d.In this study,the damage threshold of nicosulfuron and the safe isolation period were determined to be 1.50 μg/kg and 70.6 d in sandy loam,2.47 μg/kg and 52.4 d in clay loam,respectively.After 80 days of application,with the increase of the application dose of nicosulfuron(0 to 1-fold),the soil organic matter content did not change much.The alkaline nitrogen content showed a trend of first increasing and then decreasing,while the soil available phosphorus and available potassium content showed a trend of decreasing.The change trend of the physic-chemical properties in sandy loam and clay loam after application was consistent,but the change magnitude was different,which might be related to the interactions between the degradation of nicosulfuron and tobacco in two texture soils.So,the results of this study can provide important guidance for the rational and safe use of nicosulfuron herbicides and the degradation and control of residual in different texture soils of tobacco-planting areas.关键词
烟田土壤/烟嘧磺隆/降解特征/致害阈值Key words
tobacco-planting soils/nicosulfuron/degradation characteristics/damage threshold分类
农业科技引用本文复制引用
杨金印,彭梁睿,李彩斌,陈建国,戴衍晨,肖志鹏,母婷婷,郜军艺,张继光..不同质地土壤中烟嘧磺隆降解特征与烟草致害阈值研究[J].中国烟草科学,2023,44(6):29-35,7.基金项目
贵州省烟草公司毕节市公司科技项目(2020520500240072、2023520500240162、2021520500240048) （2020520500240072、2023520500240162、2021520500240048）
湖南省烟草公司衡阳市公司科技项目(2020430400240090) （2020430400240090）
湖南省烟草公司郴州市公司科技项目(郴烟运2019-45) （郴烟运2019-45）
中国农业科学院科技创新工程(ASTIP-TRIC06) （ASTIP-TRIC06）
