du Preez, Chris, Cornie van Huyssteen, and Pearson Mnkeni. “Land Use and Soil Organic Matter in South Africa 2: A Review on the Influence of Arable Crop Production”. South African Journal of Science 107, no. 5/6 (May 16, 2011): 8 pages. Accessed May 2, 2024. https://sajs.co.za/article/view/10033.