六种常用农药在番茄上的残留动态研究

研究了番茄在大棚栽培条件下,喷施联苯菊酯、氯氰菊酯、氰戊菊酯、百菌清、乐果和马拉硫磷农药在番茄中的残留降解动态和最终残留量。结果表明,不同农药品种在番茄中的残留量差异较大,有机氯、拟除虫菊酯类农药在果实中的残留量较少,4种农药在推荐和加倍用量下不到5 d均达到国家限量标准。在加倍用量时百菌清降解半衰期7.70 d,半衰期最长。两种有机磷类农药在推荐用量和加倍用量下,乐果的半衰期分别为5.22 d和5.89 d,马拉硫磷半衰期分别为3.79 d和4.54 d,为确保科学安全地使用农药,应充分考虑农药的半衰期,以利于无公害番茄的安全生产。

Dynamic Research on Residue of Six Commonly Used Pesticides in Tomato

The degradation dynamics of residue and final residue of bifenthrin,cypermethrin,fenvalerate,chlorothalonil,dimethoate and malathion in tomato were investigated in plastic greenhouse.The results showed that different kinds of pesticide residues in tomato were obviously different.There were fewer organochlorine and pyrethroid pesticides residues in tomato.Four kinds of pesticides had reached the standards of China after spraying with recommended dose and double dose for less than 5 days.Under the condition of double dose,the half-life of chlorothalonil was about 7.70 days,which was the longest.Under the condition of recommended dosage and double dosage,the half-life of dimethoate were 5.22 and 5.89 days,while that of malathion were 3.79 and 4.54 days,respectively.Therefore,we should scientificlly use the pesticides and fully consider the half-life of pesticide to ensure the safety of tomato production