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大豆和土壤中残留的乙草胺用蒸馏水和丙酮提取，提取液经石油醚萃取，用气相色谱仪（电子捕获检测器）检测，乙草胺在土壤中的半衰期为３．６～５．５天，施药后１４～２８天消解率达９０％以上。每公顷用９０％乙草胺乳油９００～１８００ｍｌ，收获期土壤及大豆中乙草胺均未检出。
Acetochlor remaining in soybeans and soil was extracted with distilled water and acetone. The extract was extracted with petroleum ether and detected by gas chromatography (electron capture detector). The half-life of acetochlor in soil was 3.6-5.5 Days, 14 to 28 days after application of digestion rate of 90% or more. 90% acetochlor EC per hectare 900 ~ 1800ml, harvest soil and soybean acetochlor are not detected.