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2021 Vol.63, Issue 4 Preview Page
Water Budget Assessment for Soybean Grown in Paddy Fields Converted to Uplands Using APEX Model

APEX 모델을 이용한 콩 재배 밭 전환 논의 물수지 특성 평가

Soon-Kun Choia
,
Jaehak Jeongb
,
So-Jin Yeobc
,
Myung-Hyun Kimc
,
Min-Kyeong Kimd†
최 순군a
,
정 재학b
,
엽 소진c
,
김 명현c
,
김 민경d†
aResearcher, Climate Change Assessment Division, National Institute of Agricultural Sciences
bProfessor, AgriLife Research, Texas A&M University
cResearcher, Climate Change Assessment Division, National Institute of Agricultural Sciences
dSenior Researcher, Climate Change Assessment Division, National Institute of Agricultural Sciences
a국립농업과학원 기후변화평가과 연구원
b텍사스 A&M 대학교 아그리라이프 리서치 교수
c국립농업과학원 기후변화평가과 연구원
d국립농업과학원 기후변화평가과 수석연구원
† Corresponding author Tel.: +82-63-238-2525, Fax: +82-63-238-3823 E-mail: kimmk72@korea.kr
2021. pp. 55-64
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Abstract

The expansion of upland crop cultivation in rice paddy fields is recommended by the Korean government to solve the problem of falling rice price and reduction of rice farmer’s income due to oversupply of rice. However, water use efficiency is significantly influenced by the land use change from paddy field to upland. Therefore, this study aimed to evaluate the water budget of soybean grown in using APEX (Agricultural Policy and Environmental eXtender) model. The amount of runoff was measured in a test bed located in Iksan, Jeollabu-do and used to calibrate and validate the simulated runoff by APEX model. From 2019 to 2020, the water budget of soybean grown in uplands were estimated and compared with the one grown in paddy fields. The calibration result of APEX model for runoff showed that R2 (Coefficient of determination) and NSE (Nash-Sutcliffe efficiency) were 0.90 and 0.89, respectively. In addition, the validated results of R2 and NSE were 0.81 and 0.62, respectively. The comparative study of each component in water budget showed that the amounts of evapotranspiration and percolation estimated by APEX model were 549.1 mm and 375.8mm, respectively. The direct runoff amount from upland was 390.1 mm, which was less than that from paddy fields. The average amount of irrigation water was 28.7 mm, which was very small compared to the one from paddy fields.

Keywords
Soybean
paddy
water budget
APEX model
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Information
  • Publisher :The Korean Society of Agricultural Engineers
  • Publisher(Ko) :한국농공학회
  • Journal Title :Journal of Korean Society of Agricultural Engineers
  • Journal Title(Ko) :한국농공학회논문집
  • Volume : 63
  • No :4
  • Pages :55-64
  • Received Date : 2021-02-22
  • Revised Date : 2021-06-10
  • Accepted Date : 2021-06-10
  • DOI :https://doi.org/10.5389/KSAE.2021.63.4.055
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