摘要
通过对辛硫磷和氧化乐果2种农药在丹参根内和土壤中的降解过程和残留进行分析,结果表明:2种农药在丹参根内的降解过程都呈单峰曲线,即灌药后1～5d,丹参根逐步吸收农药,表现为根内农药含量呈上升趋势;氧化乐果在灌根后第5天丹参根内的含量达到高峰(6.11mg/kg),随后开始降解,而辛硫磷则在灌根后第10天达到高峰(9.49mg/kg);丹参对这2种农药的吸收量和吸收速度不同。辛硫磷在丹参根内的半衰期为9.2075d,明显高于苹果上使用辛硫磷的半衰期,说明辛硫磷在防治地下害虫时残效期长;氧化乐果在丹参根内的半衰期为4.4d。辛硫磷、氧化乐果在土壤中的降解过程都为明显的衰减曲线,辛硫磷在土壤中的半衰期为16.3709d,比在丹参根内降解的速度慢,而氧化乐果的半衰期为3.4675d,比在丹参根内的降解速度稍快。由此可知,在丹参生产过程中使用辛硫磷是安全的,且可提高地下害虫的防治效果。
Absorbing and degradation process of phoxim and omethoate in root and in soil are measured and analyzed.The result showed that the absorbing and degradation process of 2 pesticides in root of S.miltiorrhiza are a peak curves,namely,5 days after treatment,the residue amount of omethoate in root is the most(6.11 mg/kg),and then fall,and the residue-half-time (T_(1/2)) of omethoate is 4.4 days.And 10 days after treatment the residue amount of phoxim in root is the most (9.49 mg/kg),and then fall,and the residue-half-time (T_(1/2)) of phoxim is 9.207 5 days.The absorbed quantity and speed,and degradation speed are different between phoxim and omethoate.The degradation process of phoxim and omethoate in soil are attenuation curves.The residue-half-time (T_(1/2)) of phoxim in soil is 16.370 9 days,the degradation rate is lower than in S.miltiorrhiza,and omethoate in soil is 3.467 5 days,faster than in S.miltiorrhiza.Phoxim is safe and good for cotrolling pest in soil during production of S.miltiorrhiza.
出处
《西北农林科技大学学报（自然科学版）》
CSCD
北大核心
2003年第B10期32-34,共3页
Journal of Northwest A&F University(Natural Science Edition)
基金
陕西天士力植物药业有限公司科研基金(2002-01)
