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2026 Vol.71, Issue 3 Preview Page

Original Research Article

Evaluation of Irrigation Criteria and Nitrogen Topdressing Rate for Soybean under Subsurface Drip Fertigation

지중점적관비 재배에서 관수 기준 및 질소 추비량에 따른 콩 생육과 수량 반응

Jong Hyuk Kim1
,
Yeon Ju Lee1
,
Ye Rin Kim2
,
Do Hui Kim3
,
Seo Young Mun3
,
Il Rae Rho45*
김 종혁1
,
이 연주1
,
김 예린2
,
김 도희3
,
문 서영3
,
노 일래45*
1Researchers, National Institute of Agricultural Sciences, RDA, Jeonju 54875, Korea
2Ph.D, Department of Applied Life Science, Gyeongsang National University, Jinju 52828, Korea
3MS, Department of Applied Life Science, Gyeongsang National University, Jinju 52828, Korea
4Professor, Department of Agronomy, Gyeongsang National University, Jinju 52828, Korea
5Senior Researcher, Smart Farm & Space Agriculture Research Institute, Gyeongsang National University, Jinju 52828, Korea
1농촌진흥청 국립농업과학원 전문연구원
2경상국립대학교 응용생명과학부 박사과정
3경상국립대학교 응용생명과학부 석사과정
4경상국립대학교 농학과 교수
5경상국립대학교 스마트팜·우주 농업연구소 책임연구원
*Corresponding Author
1 September 2026. pp. 115-126
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Abstract

To establish irrigation and nitrogen fertigation criteria for soybean (Glycine max (L.) Merr.) under subsurface drip fertigation (SDF), sequential pot and field experiments were conducted under sandy loam soil conditions. In 2021, the amount of irrigation required and electrical conductivity (EC) of the nitrogen-based fertigation solution were evaluated, and in 2022, field responses to nitrogen topdressing rates were examined. The amount of irrigation required to supply water to the soil surface was 24.3 ton/10a. In the pot experiment, EC 1.0 (N 2.4 kg/10a) facilitated the greatest nitrogen uptake, growth, and yield. Based on this result, field treatments were established with total nitrogen topdressing rates of N 2, 4, and 6 kg/10a, split equally between the R1 and R2 stages. In the field experiment, growth tended to increase with increasing nitrogen application rate, whereas seed yield was highest under treatment N2, which was 27.4% higher than that of the control. The number of nodules was also highest under N2 and decreased with increasing nitrogen topdressing rate. These results suggest that, in the sandy loam environment of this study, SDF at 24.3 ton/10a per fertigation event, with a total nitrogen topdressing of 2 kg/10a split between R1 and R2, is suitable for improving nodule formation and seed yield in soybean.

Keywords
fertigation
irrigation
nitrogen
soybean
subsurface drip system
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Information
  • Publisher :The Korean Society of Crop Science
  • Publisher(Ko) :한국작물학회
  • Journal Title :The Korean Journal of Crop Science
  • Journal Title(Ko) :한국작물학회지
  • Volume : 71
  • No :3
  • Pages :115-126
  • Received Date : 2026-06-09
  • Revised Date : 2026-07-07
  • Accepted Date : 2026-07-21
  • DOI :https://doi.org/10.7740/kjcs.2026.71.3.115
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