폴리에틸렌 멀칭재배시 농약의 토양 및 작물체중 잔류에 관한 연구 - 제3보 토양살충제 Endosulfan , Fonofos , Ethoprophos 의 잔류성 - = Originals : Studies on Persistence of Pesticides in Soils and Crops under Polyethylene Film Mulching Culture - Ⅲ. Persistence of Soil Insecticides Endosulfan , Fonofos and Ethoprophos

다국어 초록 (Multilingual Abstract)

This experiment was conducted to evaluate the effect of polyethylene film(P.E.) mulching on degradation of the soil insecticides, endosulfan(6, 7, 8, 9, 10, 10-hexachloro-1, 5, 5a, 6, 9, 9a-hexahydro-6, 9-methano-2, 4, 3-benzodioxathiepin-3-oxide), fonofos(O-ethyl S-phenyl ethylphosphonodithioate), and ethorprophos(O-ethyl S, S-dipropyl phosphorodithioate) in red pepper, peanut, and sesame fields. Degradation of endosulfan, fonofos and ethoprophos in the soils under P.E. mulching and non-mulching followed first-order kinetics. The half-lives of fonofos, ethoprophos, α- and β-endosulfan were 19∼21, 25∼37, 33∼39 and 56∼81 days, respectively. There were few differences in the half-lives of fonofos in either mulching or non-mulching concitions. However, half-lives of α-endosulfan, ethoprophos, and β-endosulfan were 6, 12 and 25 days longer under P.E, mulching than under non-mulching conditions, respectively. The effect of P.E. mulching on degradation was remarkable for the slower degrading insecticides. Residues of ethoprophos in the harvested sesame under P.E. mulching and non-mulching conditions were 0.024 and 0.074ppm, respectively. Residues of fonofos in the harveated peanuts under P.E. muclhing and non-mulching conditions were 0.078 and 0.017ppm, respectively. However, no endosulfan was detected in the harvested red peppers under either condition.