摘要
通过两季马铃薯大田试验，研究了嗪草酮在灌溉沙壤土中的消失和移动情况。结果表明，表层土壤中，嗪草酮施用后最初７～１５天内其含量急剧降低，此后随时间推移降低幅度平缓，１９９３年和１９９４年试验结束时的残留量分别为５．９μｇ／ｋｇ和２．３μｇ／ｋｇ。两年共采集的３７９个土样（分布在１５～７５ｃｍ各土层）中只有５个检测到有嗪草酮。１９９４年大田１３５ｃｍ土层处的水样中，嗪草酮的检测率高达６６％，检测浓度范围为０．０６～１５．８５μｇ／ｋｇ，平均浓度为１．９４μｇ／ｋｇ。相比较，嗪草酮在大田试验中的消失速率远大于实验室控制条件下的降解速率。
Two year potato field studies were conducted to determine the dissipation and movement of metribuzin in a sandy loam soil.Metribuzin was found to dissipate rapidly during the initial 7 to 15 days in 0 to 15cm layer soil,then decrease slowly with time.The residue levels at the end of the growing season were 5.9 and 2.3 μg/kg in 1993 and 1994 respectively.Metribuzin was detected in only 5 among 379 soil samples taken from 15 to 75 cm in two years.Sixty six percentage of field water samples at 135cm depth contained detectable levels of metribuzin in 1994.The detectable concentration of metribuzin in water samples ranged from 0.06 to 15.85 μg/kg,and the medial concentration was 1.94 μg/kg.The dissipation of metribuzin in field was much faster than its degradation under laboratory conditions.
出处
《中国环境科学》
EI
CAS
CSSCI
CSCD
北大核心
1997年第4期316-320,共5页
China Environmental Science
关键词
嗪草酮
迁移
降解
砂壤土
土壤
metribuzin,movement,degradation,sandy loam soil.
