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2025 Vol.58, Issue 3 Preview Page

Original research article

Slope construction increased surface drainage but caused drought stress on soybean growth at Saemangeum reclaimed tideland
Seung-Beom Lee1
,
Yerim Oh1
,
Kwang-Seung Lee2
,
Kyung-Hwa Han3
,
Jin-Hyeob Kwak4*
1Master’s Student, Department of Rural Construction Engineering, Jeonbuk National University, Jeonju 54896, Korea
2Researcher, Reclaimed Land Agricultural Research Center, National Institute of Crop and Food Science, RDA, Wanju 55365, Korea
3Head, Soil water Biolab, Wanju 55365, Korea
4Associate Professor, Department of Rural Construction Engineering, Jeonbuk National University, Jeonju 54896, Korea
*Corresponding Author
31 August 2025. pp. 346-356
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Abstract

Reclaimed tidelands (RTLs) in Korea were originally developed for rice cultivation; however, converting paddy to upland field is encouraged to improve grain self-sufficiency. However, due to poor drainage, high salinity, and low nutrient availability, cultivating upland crops in RTLs have many challenges. Furthermore, frequent extreme weather events, such as precipitation, heatwaves, and droughts, uncertainty of cultivation management is increasing. Therefore, this study was conducted to evaluate the effect of slope construction on improving drainage through soil water content, and to analyze the effects of drought on soil water and soybean (Glycine max L. Merr.) growth in sloped and flat fields. Slope construction, in combination with high saturated hydraulic conductivity (0.07 cm hr-1) and surface drainage, led to a rapid decrease in soil water content after rainfall, which is benefit to reduce excess moisture injury for soybean during heavy rain season. However, after monsoon season, low precipitation caused soil water content to drop below 10%. Furthermore, prolonged high temperature from July to September, which includes flowering and pod-filling stages, caused sterility of pods and reduced overall yield. Such yield reduction was more prominent in sloped plot due to improved drainage efficiency. This study highlights the need for effective climate-resilient water management strategies, including irrigation and drainage, to support sustainable soybean cultivation in reclaimed tidelands.

Slope construction improved surface drainage but caused drought damage on soybean growth during flowering and pod-filling period in the Saemangeum reclaimed tideland.
Keywords
Climate change
Fe mottles
Heat wave
Water stress
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Information
  • Publisher :Korean Society of Soil Science and Fertilizer
  • Publisher(Ko) :한국토양비료학회
  • Journal Title :Korean Journal of Soil Science and Fertilizer
  • Journal Title(Ko) :한국토양비료학회 학회지
  • Volume : 58
  • No :3
  • Pages :346-356
  • Received Date : 2025-07-31
  • Revised Date : 2025-08-13
  • Accepted Date : 2025-08-15
  • DOI :https://doi.org/10.7745/KJSSF.2025.58.3.346
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