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Runoff of Endosulfan by Rainfall Simulation and from Soybean-grown Field Lysimeter

인공강우와 콩재배 포장 라이시메타를 이용한 endosulfan의 유출량 평가

  • Kim, Chan-Sub (Pesticide Safety Division, National Institute of Agriculture Science and Technology, Rural Development Administration) ;
  • Lee, Hee-Dong (Pesticide Safety Division, National Institute of Agriculture Science and Technology, Rural Development Administration) ;
  • Ihm, Yang-Bin (Pesticide Safety Division, National Institute of Agriculture Science and Technology, Rural Development Administration) ;
  • Im, Geon-Jae (Pesticide Safety Division, National Institute of Agriculture Science and Technology, Rural Development Administration)
  • 김찬섭 (농업과학기술원 농약평가과) ;
  • 이희동 (농업과학기술원 농약평가과) ;
  • 임양빈 (농업과학기술원 농약평가과) ;
  • 임건재 (농업과학기술원 농약평가과)
  • Published : 2007.12.31

Abstract

Three different experiments were carried out to investigate the runoff and erosion losses of endosulfan from sloped-field by rainfall. The mobility of endosulfan and which phase it was transported by were examined in adsorption study, the influence of rainfall pattern and slope degree on the pesticide loss were evaluated in simulated rainfall study, and the pesticide losses from soybean-grown field comparing with bare soil were measured in field lysimeter study. Adsorption parameter (K) of endosulfan ranged from 77 to 131 by adsorption method and K values by the desorption method were higher than those by the adsorption method. By the SSLRC's classification for pesticide mobility endosulfan was classified as non-mobile class ($K_{oc}>4,000$). Runoff and erosion loss of endosulfan by three rainfall scenarios ranged from 3.4 to 5.6%and from 4.4 to 15.6%of the amount treated. Endosulfan residues were mainly remained at the top 5 cm of soil depth after the simulated rainfall study. Pesticide loss in case of 30%-slope degree ranged from 0.6 to 0.9 times higher than those in case of 10%-slope degree. The difference of pesticide runoff loss was related with its concentration in runoff water and the difference of pesticide erosion loss would related closely with the quantity of soil eroded. Endosulfan losses from a series of lysimeter plots in sloped land by rainfall ranged from 5 to 35% of the amount treated. The erosion rate of endosulfan from soybean-plots was 66% of that from bare soil plots. The effect of slope conditions was not great for runoff loss, but was great for erosion loss as increasing to maximum $4{\sim}12$ times with slope degree and slope length. The peak runoff concentration of endosulfan in soybean-plots and bare soil plots ranged from 8 to 10 and from 7 to $9{\mu}gL^{-1}$ on nine plots with different slope degree and slope length. Therefore the difference of the peak runoff concentrations between bare soil plots and soybean-plots were not great.

Keywords

runoff;erosion;adsorption;endosulfan;lysimeter

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