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Mobility of pesticides in different soil textures and gravel contents under soil column  

Lee, Sang-Min (Department of Biological Environment, College of Agriculture and Life Sciences, Kangwon National University)
Kim, Seong-Soo (Department of Biological Environment, College of Agriculture and Life Sciences, Kangwon National University)
Park, Dong-Sik (Department of Biological Environment, College of Agriculture and Life Sciences, Kangwon National University)
Hur, Jang-Hyun (Department of Biological Environment, College of Agriculture and Life Sciences, Kangwon National University)
Publication Information
The Korean Journal of Pesticide Science / v.9, no.4, 2005 , pp. 330-337 More about this Journal
Abstract
This study was investigated to elucidate the pesticide mobility in three different soil textures(Heongseong sandy loam; Chuncheon, loam; Taeback, silty clay loam) and four different gravel contents(0, 20, 40, 60%) of Taebaek soil using soil column. Carbofuran, which ranks the highest water solubility among 7 pesticides(carbendazim, carbofuran, chlorpyrifos, cypermethrin, dimethomorph, diniconazole and endosulfan) was defected over 87% in leachate samples within all soil types from early sampling time. Amount of 5 residual pesticides excluding carbendazim and carbofuran were ordered silty clay loam > loam > sandy loam, indicating pesticide residues are related to percentage of clay contents in soils. Comparing the amount of residual pesticides in soil column(upper, middle and lower layer), 6 pesticides apart from carbofuran were found in the range of $50{\sim}92%$ on the upper layer of silty clay loam and loam. Mobility of pesticides either in soil or leachate samples is dependant on water solubility of pesticide and clay content of soil. The results obtained from four different gravel contents of Tacback soil were similar to the results of three different soil textures. Also it was found that more the gravel contents, faster the flow velocity of leachate water. These results possibly provide an idea to select proper pesticides and to reduce soil and water contamination at alpine and sloped-land.
Keywords
alpine and sloped-land; water leachate; soil texture; pesticide residue; pesticide mobility;
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