Effects of clothianidin seed treatment on watermelon growth and development,and its residue analysis
To elucidate the effects of seed treatment with neonicotinoid insecticide clothianidin on the growth,development,and quality of watermelon,physiological assessments of watermelon and residue analyses of clothianidin were performed using clothianidin 10％FS as the test agent.The results showed that clothianidin ranged from 100 to 250 g/100 kg was safe for emergence of watermelon seedling.Clothianidin treatment had a positive effect on plant height,stem diameter,chlorophyll content,and leaf area during the seedling stage.This positive effect weakened with the growth of plant.After seed emergence for 30 days,no significant differences were observed among treatments.Moreover,the treatment resulted in increased yields compared to the control group,and enhanced the content of soluble sugar and soluble solids in watermelon,consequently improving the quality of watermelon.As watermelon plants matured,the content of clothianidin in leaves gradually decreased,with no detectable clothianidin residue remaining 45 days after emergence.In addition,no clothianidin residue was detected in harvested fruits.The residual level of clothianidin in watermelon root soil ranged from 0.041 2 to 0.097 5 mg/kg.In conclusion,clothianidin seed treatment at dosages of 100-250 g/100 kg promotes the growth of watermelon at seedling stage,increases yield,and improves watermelon quality.The content of clothianidin in leaves gradual decline and no residue were determined in fruits.This study provides technical support for the reasonable,safe and efficient application of clothianidin seed treatment in watermelon production practices.
clothianidinseed treatmentgrowth and developmentqualityresidue
万方数据
维普
