Development of Models to Estimate Total Soil Carbon across Different Croplands at a Regional Scale Using RGB Photography

Yeon-Kyu Sonn, Jun-Hyuk Yoo, Deogratius Luyima, Jae-Han Lee, Jin-Hyuk Chun, Yun-Gu Kang, Taek-Keun Oh and Jaesung Cho
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Yeon-Kyu Sonn: Soils & Fertiliser Management Division, Department of Agricultural Environment, National Institute of Agricultural Science, Rural Development Administration, Wanju 55365, Korea
Jun-Hyuk Yoo: Department of Bio-Environmental Chemistry, College of Agricultural and Life Sciences, Chungnam National University, Daejeon 34134, Korea
Deogratius Luyima: Department of Bio-Environmental Chemistry, College of Agricultural and Life Sciences, Chungnam National University, Daejeon 34134, Korea
Jae-Han Lee: Department of Bio-Environmental Chemistry, College of Agricultural and Life Sciences, Chungnam National University, Daejeon 34134, Korea
Jin-Hyuk Chun: Department of Bio-Environmental Chemistry, College of Agricultural and Life Sciences, Chungnam National University, Daejeon 34134, Korea
Yun-Gu Kang: Department of Bio-Environmental Chemistry, College of Agricultural and Life Sciences, Chungnam National University, Daejeon 34134, Korea
Taek-Keun Oh: Department of Bio-Environmental Chemistry, College of Agricultural and Life Sciences, Chungnam National University, Daejeon 34134, Korea
Jaesung Cho: Department of Animal Science and Biotechnology, College of Agricultural and Life Sciences, Chungnam National University, Daejeon 34134, Korea

IJERPH, 2022, vol. 19, issue 15, 1-11

Abstract: A quick, accurate and cost-effective method for estimating total soil carbon is necessary for monitoring its levels due to its environmentally and agronomically irreplaceable importance. There are several impediments to both laboratory analysis and spectroscopic sensor technology because the former is both expensive and time-consuming whereas the initial cost of the latter is too high for farmers to afford. RGB photography obtained from digital cameras could be used to quickly and cheaply estimate the total carbon (TC) content of the soil. In this study, we developed models to predict soil TC contents across different cropland types including paddy, upland and orchard fields as well as the TC content of the soil combined from all the aforementioned cropland types on a regional scale. Soil colour measurements were made on samples from the Chungcheongnam-do province of South Korea. The soil TC content ranged from 0.045% to 6.297%. Modelling was performed using multiple linear regression considering the soil moisture levels and illuminance. The best soil TC prediction model came from the upland soil and gave training and validation r 2 values of 0.536 and 0.591 with RMSE values of 0.712% and 0.441%, respectively. However, the most accurate equation is the one that produces the lowest RMSE value. Hence, although the model for the upland soil was the most stable of all, the paddy soil model which gave training and validation r 2 values of 0.531 and 0.554 with RMSE values of 0.240% and 0.199%, respectively, was selected as the best soil TC prediction equation of all due to its comparatively high r 2 value and the lowest RMSE of all equations.

Keywords: multiple regression models soil colour; RGB photography; total soil carbon (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
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