Changes of Soil Salinity due to Flooding in Newly Reclaimed Saline Soil

신간척지 토양에서 담수에 의한 토양염도 변화에 대한 개관

  • Ryu, J.H. (Department of Rice and Winter Cereal Crop., NICS, RDA) ;
  • Yang, C.H. (Department of Rice and Winter Cereal Crop., NICS, RDA) ;
  • Kim, T.K. (Department of Rice and Winter Cereal Crop., NICS, RDA) ;
  • Lee, S.B. (Department of Rice and Winter Cereal Crop., NICS, RDA) ;
  • Kim, S. (Department of Rice and Winter Cereal Crop., NICS, RDA) ;
  • Baek, N.H. (Department of Rice and Winter Cereal Crop., NICS, RDA) ;
  • Choi, W.Y. (Department of Rice and Winter Cereal Crop., NICS, RDA) ;
  • Kim, S.J. (Department of Rice and Winter Cereal Crop., NICS, RDA) ;
  • Chung, D.Y. (College of Agricultural and Life science, Chungnam National University)
  • 유진희 (국립식량과학원 간척지농업과) ;
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  • 정덕영 (충남대학교 농업생명과학대학 생물환경화학과)
  • Received : 2009.06.12
  • Accepted : 2009.08.06
  • Published : 2009.12.28

Abstract

This study was carried out to identify the changes of EC during desalinization due to flooding in newly reclaimed saline soil. To do this, experimental plots were made of rotary tillage+water exchanging plot, flooding plot and rainfall flooding plot. In rotary tillage+water exchanging plot, drainage, rotary tillage and flooding were conducted at the interval of 7 days. In rotary tillage+water exchanging plot and flooding plot, plots were irrigated at the height of 10 cm. After 38 days desalinization, changes of EC values at top soil (0~20 cm) were as follows. In rotary tillage+water exchanging plot, EC decreased from $21.38dS\;m^{-1}$ to $2.16dS\;m^{-1}$ and in flooding plot, EC decreased from $13.97dS\;m^{-1}$ to $2.22dS\;m^{-1}$. In rotary tillage+water exchanging plot and flooding plot, EC values decreased below the EC criterion ($4.0dS\;m^{-1}$) of saline soil. In rainfall flooding plot, EC values decreased or increased according to amounts of rainfall and rainfall time. After 38 days, EC decreased from $16.7dS\;m^{-1}$ to $12.35dS\;m^{-1}$. In flooding plot, changes of EC due to soil depth were investigated. After 38 days desalinization, changes of EC due to soil depth were as follows. At 0~10 cm depth, EC value decreased from $13.08dS\;m^{-1}$ to $0.74dS\;m^{-1}$ (94.3% of salt was desalinized). At 10~20 cm depth, EC value decreased from $14.80dS\;m^{-1}$ to $3.69dS\;m^{-1}$ (75.2% of salt was desalinized). At 20~30 cm depth, soil was desalinized slowly compared with upper soil, EC value decreased from $13.57dS\;m^{-1}$ to $6.93dS\;m^{-1}$ (48.9% of salt was desalinized).

Keywords

Reclaimed land;Desalinization;EC;Salinity;Rice