砜嘧磺隆在土壤中的动态消解规律

Dynamic Digestion Patterns of Rimsulfuron in Soil

“薯/玉/豆”带状复合种植技术中,由于作物栽培时间和生育期不一致导致田间杂草管理难度较大,符合该技术的除草剂鲜有报道。砜嘧磺隆杀草谱广、选择性好,可较好应用到该技术中。为准确评价砜嘧磺隆在土壤中的残留动态,明确其在“薯/玉/豆”带状复合种植技术中应用的安全性,采用室内模拟试验,应用高效液相色谱法测定砜嘧磺隆在土壤中的残留。25%砜嘧磺隆水分散粒剂在施药量为0.5~2.0 mg/kg时,在土壤中半衰期为7.70~9.50 d,9.50 d内降解量为初始沉降剂量一半,在施药42 d后土壤残留量为0.0018~0.0090 mg/kg。为确保安全使用砜嘧磺隆,最大限度减轻除草剂造成的药害,施用砜嘧磺隆9.50 d后再栽培其他作物相对安全。

Weed management in the"potato/maize/bean"strip combined planting technology is difficult because of the inconsistency of cultivation time and fertility period of the corps.In particular,there are very few herbicides that conform to this technology.Rimsulfuron,as a herbicide with wide spectrum and good selectivity,has been effectively applied to the planting pattern.In order to accurately evaluate the residual dynamics and safety of rimsulfuron in the"potato/maize/bean"cultivated soil,the residues of rimsulfuron in soil were determined by high performance liquid chromatography(HPLC)simulated in the laboratory.When the dosage was 0.5-2.0 mg/kg,the half-life of rimsulfuron 25%WDG in soil was 7.70-9.50 days.The degradation of herbicide on 9.50 days was reduced to half of the initial settlement dose,and the pesticide residue in soil was only 0.0018-0.0090 mg/kg after 42 days of application.To ensure the safe use of rimsufuron and minimize the possible damage,it is recommended to apply rimsulfuron at least 9.50 days before planting other crops.