Spatial prediction of lime requirements by adjusting aluminium saturation in Sub-Saharan Africa croplands.

Autor: Uwiragiye Y; School of Geography, Nanjing Normal University, Nanjing 210023, China; College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, Shaanxi, China; Department of Agriculture, Faculty of Agriculture, Environmental Management and Renewable Energy, University of Technology and Arts of Byumba, Rwanda; Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture, Yangling, 712100, Shaanxi, China. Electronic address: uwyves@gmail.com., Ngaba MJY; College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, Shaanxi, China; Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture, Yangling, 712100, Shaanxi, China., Yang M; College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, Shaanxi, China; Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture, Yangling, 712100, Shaanxi, China., Elrys AS; Soil Science Department, Faculty of Agriculture, Zagazig University, Zagazig 44511, Egypt; College of Tropical Crops, Hainan University, Haikou 570228, China; Liebig Centre for Agroecology and Climate Impact Research, Justus Liebig University, Germany., Chen Z; College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, Shaanxi, China; Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture, Yangling, 712100, Shaanxi, China., Cheng Y; School of Geography, Nanjing Normal University, Nanjing 210023, China., Zhou J; College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, Shaanxi, China; Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture, Yangling, 712100, Shaanxi, China. Electronic address: jbzhou@nwsuaf.edu.cn.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2024 Jan 15; Vol. 908, pp. 167989. Date of Electronic Publication: 2023 Oct 31.
DOI: 10.1016/j.scitotenv.2023.167989
Abstrakt: Acidic soils cover over 30 % of Sub-Saharan Africa cropland. Acidic soils deprive crops of calcium, magnesium, potassium, molybdenum, and phosphorus due to aluminium (Al), manganese, and iron toxicities. Thus, liming is required to adjust the level of exchangeable Al 3+ to the desired level of Al saturation of the crops grown. Lime requirement (LR) was quantified using soil dataset from Africa soil information service (AfSIS). Spatial variations of LR of cereals, pulses and cash crops were predicted using random forest algorithm. Our results revealed that mean of LR Mg CaCO 3 (1 Mg = 10 6  g) ha -1 for cereal crops were 6.34, 6.35, and 4.41 for maize, sorghum, and upland rice, respectively. Mean of LR (Mg ha -1 ) for pulses were 6.28, 5.19, and 4.90 for common beans, soybeans, and cowpeas, respectively. Mean of LR Mg CaCO 3 (1 Mg = 10 6  g) ha -1 for cash crops were 3.41 and 6.29 for coffee and cotton, respectively. Spatial variation showed that LR in croplands was higher in tropical humid regions than in semi-arid and arid regions and ranged from 0 to 8.8 Mg ha -1 . The results of 10-fold cross validation for high model performance of LR for tested crops were coefficient of determination (R 2 ) of 0.61, a root mean square error (RMSE) of 0.5, and a mean absolute error (MAE) of 0.31, maize LR with RMSE = 0.9, MAE = 0.24, and R 2  = 0.51, and cotton LR with RMSE = 0.5, MAE = 0.31, and R 2  = 0.60. We recommend predicting lime requirement in acidic soils of Sub-Saharan Africa by adjusting Al saturation up to the tolerance of the grown crop, updating soil surveys in Sab Saharan Africa, and using digital soil mapping to monitor soil acidity and lime requirement.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests.
(Copyright © 2023 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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