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2026 Vol.68, Issue 3 Preview Page
Soybean Irrigation Requirement during Heatwaves as Affected by Paddy-Soil Physical Properties

논토양 물리성에 따른 폭염기 콩 필요수량 평가

Kyunghwa Hana
,
Jaejun Goub
,
Inhong Songc†
한 경화a
,
고 재준b
,
송 인홍c†
aHead, Soil Water Biolab, Wanju 55365, South Korea
bMS student, Department of Rural Systems Engineering, Global Smart Farm Convergence Major, Seoul National University
cAssociate Professor, Department of Rural Systems Engineering, Global Smart Farm Convergence Major, Research Institute of Agriculture and Life Sciences, Seoul National University
†Corresponding author Tel.: +82-2-880-4581, Fax: +82-2-873-2087 E-mail: inhongs@snu.ac.kr
2026. pp. 43-55
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Abstract

Heatwaves intensify evaporative demand and can expose soybean cultivated on paddy soils to short-term water deficits. We aimed to (i) estimate soybean effective rooting depth (Zₑ) across representative topographic settings and soil textures of Korean paddy fields using physical constraints of the compacted layer, and (ii) quantify irrigation requirements (IR) during heatwaves. Zₑ was inferred from thresholds of plowpan bulk density and cone penetrometer resistance, yielding a range of 17–80 cm (mean 39 cm). By topography, Zₑ ranked fluvial plains > local valley–alluvial fans > Pleistocene terraces > reclaimed fluvial-marine plains; by texture, loam > silt loam > silty clay loam > sandy loam. Using 2025 weather records from Suwon, Jeonju, and Jinju, mean daily crop evapotranspiration (ETc) during 10 consecutive dry days averaged 4.8–8.1 mm day⁻¹. Assuming no rainfall for 10 days, we evaluated IR under two ETc scenarios (5 and 8 mm day⁻¹). IR declined significantly with increasing Zₑ. At ETc = 5 mm day⁻¹, IR = 0 mm when Zₑ = 56 cm, indicating soil water storage alone met crop demand. At ETc = 8 mm day⁻¹, IR = 25 mm was still needed even with Zₑ = 80 cm. At the mean Zₑ = 39 cm, IR rose 3.5-fold from 15 mm (5 mm day⁻¹) to 53 mm (8 mm day⁻¹). These results demonstrate that heatwave irrigation decisions are a function of Zₑ and ETc, supporting site-specific IR establishment considering paddy-soil physical properties.

Keywords
Plowpan bulk density
cone penetrometer resistance
effective rooting depth
daily evapotranspiration
readily available water
References

REFERENCES

1
R. G. Allen, L. S. Pereira, D. Raes and M. Smith, FAO irrigation and drainage paper No. 56Crop evapotranspiration: Guidelines for computing crop water requirements, Food and Agriculture Organization of the United Nations (FAO). (1998)
2
P. B. Barraclough and A. H. Weir, The Journal of Agricultural Science, Effects of a compacted subsoil layer on root and shoot growth, water use and nutrient uptake of winter wheat, 110(2); 207-216 (1988)10.1017/s0021859600081235
3
A. G. Bengough, B. M. McKenzie, P. D. Hallett and T. A. Valentine, Journal of Experimental Botany, Root elongation, water stress, and mechanical impedance: A review of limiting stresses and beneficial root tip traits, 62(1); 59-68 (2011)10.1093/jxb/erq350
4
P. S. Birthal, J. Hazrana, D. S. Negi and G. Pandey, Agricultural Water Management, Benefits of irrigation against heat stress in agriculture: Evidence from wheat crop in India, 255; 106950 (2021)10.1016/j.agwat.2021.106950
5
H. R. Cho, K. H. Han, Y. S. Zhang, K. H. Jung, Y. K. Sonn, M. S. Kim and S. Y. Choi, Korean Journal of Soil Science and Fertilizer, Threshold subsoil bulk density for optimal soil physical quality in upland: Inferred through parameter interactions and crop growth inhibition, 49(5); 548-554, (in Korean) (2016)10.7745/kjssf.2016.49.5.548
6
F. Ghafarian, R. Wieland and C. Nendel, Water, Estimating the evaporative cooling effect of irrigation within and above soybean canopy, 14(3); 319 (2022)10.3390/w14030319
7
J. Glinski, Soil physical conditions and plant roots, Boca Raton, FL. CRC Press. (2018)10.1201/9781351076708
8
S. C. Gupta and W. E. Larson, Predicting tillage effects on soil physical properties and processes, Modeling soil mechanical behavior during tillage, 44; 151-178 (1982)10.2134/asaspecpub44.c10
9
I. Håkansson and J. Lipiec, Soil and Tillage Research, A review of the usefulness of relative bulk density values in studies of soil structure and compaction, 53(2); 71-85 (2000)10.1016/s0167-1987(99)00095-1
10
M. A. Hamza and W. K. Anderson, Soil and Tillage Research, Soil compaction in cropping systems: A review of the nature, causes and possible solutions, 82(2); 121-145 (2005)10.1016/j.still.2004.08.009
11
M. Heinen, H. M. Schneider, K. Shan, G. Bakker and G. Bakema, Soil and Tillage Research, The effect of a compacted subsoil layer on the development of the maize root system, 254; 106763 (2025)10.1016/j.still.2025.106763
12
R. Jiang, T. Li, Z. Jia and Y. Dong, Water, Determining soil available water capacity and reasonable irrigation volume in dryland pasture, 14(17); 2760 (2022)10.3390/w14172760
13
S. J. Jung, J. Moon, T. S. Kim, G. S. Hyeon and C. S. Park, Korean Journal of Soil Science and Fertilizer, Available soil water for textural class of Korean soils, 23(3); 167-172, (in Korean) (1990)
14
K. U. Kim, Engineering in Agriculture, Environment and Food, Farm mechanization policies in Korea, 2(4); 132-143 (2009)10.1016/s1881-8366(09)80004-9
15
L. Y. Kim, H. J. Cho, S. D. Hong and H. S. Lee, Journal of Agricultural Science, Chungbuk National University, Amelioration guideline of soil physical properties in paddy rice fields based on soil survey of dominant soil series in Korea, 29(2); 49-54 (2013)
16
KOSIS, [Synoptic Meteorological Observations] Annual normal, Accessed July 26, 2025, from http://https://kosis.kr/statHtml/statHtml.do?orgId=141&tblId=DT_14102_B002&conn_path=I3 (2025)
17
KREI Aglook, KREI (Korea Rural Economic Institute) Agricutural Outlook Center, Beans – July 2025 issue, Accessed September 16, 2025, from http://https://aglook.krei.re.kr/ (2025)
18
KMA (Korea Meteorological Administration), KMA criteria for issuing weather advisories and warnings, Accessed September 16, 2025, from http://https://www.weather.go.kr/w/community/knowledge/standard.do (2025)
19
KSIS, Field diagonosis of soil physical properties, Accessed September 16, 2025, from http://https://soil.rda.go.kr/water/soilWater.do (2025)
20
J. M. Lardy, T. M. DeSutter, A. L. Daigh, M. A. Meehan and J. A. Staricka, Agricultural & Environmental Letters, Effects of soil bulk density and water content on penetration resistance, 7(2) (2022)10.1002/ael2.20096
21
Y. Liu, K. Mizuta, M. Morokuma and M. Toyota, Field Crops Research, Effects of combined high temperature and water stress on soybean growth and physiological processes in a temperature gradient chamber, 333; 110063 (2025)10.1016/j.fcr.2025.110063
22
V. V. Medvedev, Eurasian Soil Science, Physical properties and spatial distribution of the plowpan in different arable soils, 44; 1364-1372 (2011)10.1134/s1064229311120088
23
NIAS (Nation Institute of Agricultural Sciences), Agricultural environment research report, A study on the physical properties of compacted soil, RDA, Wanju, Republic of Korea. National Institute of Agricultural Sciences. (2009)
24
NIAS (Nation Institute of Agricultural Sciences), Methods for surveying and analyzing soil physical properties, RDA, Wanju, Republic of Korea. National Institute of Agricultural Sciences. (2017)
25
NIAS (Nation Institute of Agricultural Sciences), Water use guidelines for upland crops by soil, crop, and region, RDA, Wanju, Republic of Korea. National Institute of Agricultural Sciences. (2018)
26
L. Rezaee, A. A. Moosavi, N. Davatgar and A. R. Sepaskhah, Archives of Agronomy and Soil Science, Shrinkage-swelling characteristics and plasticity indices of paddy soils: Spatial variability and their influential parameters, 66(14); 2005-2025 (2020)10.1080/03650340.2019.1706169
27
A. P. Silva, B. D. Kay and E. Perfect, Soil Science Society of America Journal, Characterization of the least limiting water range of soils, 58(6); 1775-1781 (1994)10.2136/sssaj1994.03615995005800060028x
28
D. Soba, C. Arrese-Igor and I. Aranjuelo, Plant Science, Additive effects of heatwave and water stresses on soybean seed yield is caused by impaired carbon assimilation at pod formation but not at flowering, 321; 111320 (2022)10.1016/j.plantsci.2022.111320
29
P. W. Unger and T. C. Kaspar, Agronomy Journal, Soil compaction and root growth: A review, 86(5); 759-766 (1994)10.2134/agronj1994.00021962008600050004x
30
Y. S. Zhang, D. J. Kim, K. H. Jung, H. R. Cho, K. H. Han and H. S. Lee, Korean Journal of Soil Science and Fertilizer, Effect of subsoil breaking on improvement of soil physical properties in agricultural land, 52(2); 133-142, (in Korean) (2019)10.7745/kjssf.2019.52.2.133
31
Y. Zhang, K. H. Han, K. H. Jung, H. R. Cho, M. J. Seo and Y. G. Sonn, Korean Journal of Soil Science and Fertilizer, Study on the standards of proper effective rooting depth for upland crops, 50(1); 21-30, (in Korean) (2017)10.7745/kjssf.2017.50.1.021
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 : 68
  • No :3
  • Pages :43-55
  • Received Date : 2025-09-29
  • Revised Date : 2026-02-06
  • Accepted Date : 2026-02-09
  • DOI :https://doi.org/10.5389/KSAE.2026.68.3.043
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