調查不同地區65戶水稻農戶農藥使用情形，發現10﹪以上農戶使用之農藥僅16種。其中殘留期可能較長者為Benthiocarb（殺丹）、Butachlor（丁基拉草）、Chlomethoxynil（甲氧基護谷）三種殺草劑。分析來自不同地區68個土壤樣品，發現耕犁層土壤（0-15）公分中有44.1﹪樣品含Benthiocarb，10.3﹪樣品含Butachlor，17.6﹪樣品含Chlomethoxynil。平均含量皆極微分別為57.48ppb，4.71ppb及6.09ppb。在犁底層土壤（15-30）公分樣品中，僅8.8﹪含Benthiocarb，7.4﹪樣品含Butachlor，2.9﹪樣品含Chlomethoxynil。平均含量分別為11.28ppb，5.01ppb及0.91ppb。上述土壤樣品距離施藥時間為90-130天，含量已極微，因此可證明現用農藥不會污染土壤。分析來自不同地區水樣品，發現88.2﹪樣品含有Benthiocarb，但皆不含Butachlor及Chlomethoxynil。Benthiocarb之平均含量為19.03ppb，最高之樣品中也僅含51ppb，由於此等樣品都來自稻田附近，若經灌溉水及河水稀釋，含量當更少，因此不會造成污染河水之問題。

Survery of pesticides used in the paddy field indicated that 16 different pesticides were commonly used by the farmers. Among these pesticides, the persistence of benthiocarb, butachlor and chlomethoxynil might be relatively longer than others. Analysis of 68 soil samples collected from the paddy field right after the rice was harvested (it was about 90-130 day after last application of these herbicides) revealed that in the surface soil (0-15cm), 44.1% contained benthiocarb, 7.4% contained butachlor and 17.6% contained chlomethoxynil with residual levels at 57.48 ppb. 4.71 ppb and 6.09 ppb. respectively, In the bottom soil (15-30cm),8.8% contained benthiocarb, 7.4% contained butachlor and 2.9% contained chlomethoxynil with average residual lebels at 11.28 ppb, 5.01 ppb and 0.91 ppb, respectively. Analysis of the water samples from paddy filed of different localities in Taiwan indicated that 88.2% contained benthiocarb, The average residual level was 19.03 ppb. The highest residual level was 51 ppb. No residues of butachlor and chlomethloxynil were detected. These results suggested that the pollution caused by the currently used pesticides in agriculture might not be a serious problem.