氰戊菊酯和乐果在不同作物上的残留降解

本文报道了氰戊菊酯和乐果在不同作物上的消解动态。研究结果表明,上述二种农药在小麦、鸡毛菜、桃子上的起始残留浓度和降解速度都不同,起始残留浓度依次为麦叶>鸡毛菜>麦穗>桃子,这主要与作物比表面积有关,氰戊菊酯的降解半衰期在鸡毛菜上为1.98天、麦穗为5.21天、桃子为7.19天、麦叶为11.65天,乐果在鸡毛菜上的半衰期为0.95天、麦穗为1.85天、麦叶为1.93天、桃子为4.48天。在其他条件基本一致时,农药降解半衰期与作物的生长系数有很大关系。

THE RESIDUE DEGRADATION OF PESTICIDES IN DIFFERENT CROPS

This paper reports degradation behaviour of pesticidcs in different crops.The experimental results show that initial residue concentration and degradation rate are different in wheat small green vegetable,peach for either fenvalerate or dimethoale.The descending order of initial residuc concentration is as follows:wheat leaf>small green vegetable>the ear of wheat>peach.Inintial residue concentration is associated with relative surface area of the crops.The half 1ife of fenvaleratc is 1.98 days in small green vegetabl,5.21 days in the ear of wheat,7.19 days in peach and 11.65 days in wheat leaf.The half life of dimethoatc is 0.95 days in small green vegetable,1.85 days in the ear of wheat,1.93 days in wheat leaf and 4.48 days in peach.The half life of degradation is mainly related to growth coeffieicnt of crops when the applied exteral conditions are identical.