Journal of the Korean Society of Industry Convergence (한국산업융합학회 논문집)

The Korean Society of Industry Convergence (한국산업융합학회)
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Modeling Growth of Canopy Heights and Stem Diameters in Soybeans at Different Groundwater Level

지하 수위가 다른 조건에서 콩의 초장과 경태 모델링

  • Choi, Jin-Young (Dept. of Bio-Industrial Machinery Eng.,Pusan Natl. Univ.) ;
  • Kim, Dong-Hyun (Dept. of Bio-Industrial Machinery Eng.,Pusan Natl. Univ.) ;
  • Kwon, Soon-Hong (Dept. of Bio-Industrial Machinery Eng.,Pusan Natl. Univ.) ;
  • Choi, Won-Sik (Dept. of Bio-Industrial Machinery Eng.,Pusan Natl. Univ.) ;
  • Kim, Jong-Soon (Dept. of Bio-Industrial Machinery Eng.,Pusan Natl. Univ.)
  • 최진영 (부산대학교 바이오산업기계공학과) ;
  • 김동현 (부산대학교 바이오산업기계공학과) ;
  • 권순홍 (부산대학교 바이오산업기계공학과) ;
  • 최원식 (부산대학교 바이오산업기계공학과) ;
  • 김종순 (부산대학교 바이오산업기계공학과)
  • Received : 2017.10.24
  • Accepted : 2017.11.29
  • Published : 2017.12.31
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Abstract

Cultivating soybeans in rice paddy field reduces labor costs and increases the yield. Soybeans, however, are highly susceptible to excessive soil water in paddy field. Controlled drainage system can adjust groundwater level (GWL) and control soil moisture content, resulting in improvement soil environments for optimum crop growth. The objective of this study was to fit the soybean growth data (canopy height and stem diameter) using Gompertz model and Logistic model at different GWL and validate those models. The soybean, Daewon cultivar, was grown on the lysimeters controlled GWL (20cm and 40cm). The soil textures were silt loam and sandy loam. The canopy height and stem diameter were measured from the 20th days after seeding until harvest. The Gompertz and Logistic models were fitted with the growth data and each growth rate and maximum growth value was estimated. At the canopy height, the $R_2$ and RMSE were 0.99 and 1.58 in Gompertz model and 0.99 and 1.33 in Logistic model, respectively. The large discrepancy was shown in full maturity stage (R8), where plants have shed substantial amount of leaves. Regardless of soil texture, the maximum growth values at 40cm GWL were greater than the value at 20cm GWL. The growth rates were larger at silt loam. At the stem diameter, the $R_2$ and RMSE were 0.96 and 0.27 in Gompertz model and 0.96 and 0.26 in Logistic model, respectively. Unlike the canopy height, the stem diameter in R8 stage didn't decrease significantly. At both GWLs, the maximum growth values and the growth rates at silt loam were all larger than the values at sandy loam. In conclusion, Gompertz model and Logistic model both well fit the canopy heights and stem diameters of soybeans. These growth models can provide invaluable information for the development of precision water management system.

Keywords

References

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