Korean Journal of Environmental Agriculture (한국환경농학회지)

The Korean Society of Environmental Agriculture (한국환경농학회)
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Effect of Organic Residue Incorporation on Salt Activity in Greenhouse Soil

시설재배지 토양에서 유기자재 투입이 염류활성도에 미치는 영향

  • Lee, Seul-Bi (Division of Applied Life Science, Graduate School (Brain Korea 21 Program), Gyeongsang National University) ;
  • Lee, Chang-Hoon (Department of Crop Sciences, University of Illinois) ;
  • Hong, Chang-Oh (Plant Science Department, South Dakota State University) ;
  • Kim, Sang-Yoon (Division of Applied Life Science, Graduate School (Brain Korea 21 Program), Gyeongsang National University) ;
  • Lee, Yong-Bok (National Academy of Agricultural Science) ;
  • Kim, Pil-Joo (Division of Applied Life Science, Graduate School (Brain Korea 21 Program), Gyeongsang National University)
  • Published : 2009.12.30
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Abstract

In Korea, salt stress is one of the major problems limiting crop production and eco-environmental quality in greenhouse soil. The objective of this study was to evaluate the effectiveness of organic residues (Chinese milk vetch, maize stalk, rice straw, and rye straw) for reducing salt activity in greenhouse soil. Organic residues was incorporated with salt-accumulated soil (EC, 3.0 dS $m^{-1}$) at the rate of 5% (wt $wt^{-1}$) and the changes of electrical conductivity (EC) was determined weekly for 8 weeks under incubation condition at $30^{\circ}C$. The EC, microbial biomass carbon (MBC), and water soluble ions in soil was strongly affected by C/N ratio of organic residues. After 8 weeks incubation, the concentration of water soluble $NO_3{^-},\;Ca^{2+}$, and $Mg^{2+}$ was significantly decreased in organic residues having high C/N ratio (maize stalk, rice straw, and rye straw) incorporated soil compared to organic residues having lower C/N ratio (Chinese milk vetch) incorporated soil. The EC value in Chinese milk vetch incorporated soil was higher than control treatment. In contrast, maize stalk, rice straw, and rye straw amended soil was highly decreased the EC value compared to control and Chinese milk vetch applied soil after 4 weeks incubation. Our results indicated that incorporation of organic residues having high C/N ratio (>30) could reduce salt activity resulting from reducing concentration of water soluble ions.

Keywords

References

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