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World’s Soil Resources

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in the Free State. Bloemfontein, University of the Free State. (M.Sc. dissertation)<br />

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Cape Province. S Afr J Plant <strong>Soil</strong>, 23(2): 93-98.<br />

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Crossley, D.A., , Mueller, B.R. & Perdue, J.C. 1992. Biodiversity of Microarthropods in agricultural soils:<br />

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Ecology. CRC Press, Boca Raton.<br />

De Villiers, M.C., Pretorius, D.J., Barnard, R.O., Van Zyl, A.J. & Le Clus, C.F. 2002. Land degradation<br />

assessment in dryland areas: South Africa. FAO Land Degradation Assessment in Dryland Project. Rome, FAO.<br />

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Dregne, H. & Chou, N. 1992. Global desertification: dimensions and costs. In H. Dregne, ed. Degradation and<br />

restoration of arid lands. Lubbock, Texas Tech. University.<br />

Dregne, H. E. 1990. Erosion and soil productivity in Africa. Journal of <strong>Soil</strong> &Water Conservation, 45(4): 431–436.<br />

Du Preez, C.C., Mnkeni, P.N.S. & Van Huyssteen, C.W. 2010. Knowledge review on land use and soil organic<br />

matter in South Africa. 19th World Congress of <strong>Soil</strong> Science, <strong>Soil</strong> Solutions for a Changing World, 1 – 6 August<br />

2010. Australia, Brisbane.<br />

Du Preez, C.C., Mnkeni, P.N.S. & Van Huyssteen, C.W. 2011a. Knowledge review on land use and soil<br />

organic matter in South Africa 1. Spatial variability and rangeland stock production. S. Afr. J. Sci., 207: 27-34.<br />

Du Preez, C.C., Mnkeni, P.N.S. & Van Huyssteen, C.W. 2011b. Knowledge review on land use and soil<br />

organic matter in South Africa 2: Arable crop production. S. Afr. J. Sci., 207: 35-42.<br />

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topsoils, soil properties and climatic data in South Africa. South African Journal of Plant and <strong>Soil</strong>, 10: 168-173.<br />

Status of the <strong>World’s</strong> <strong>Soil</strong> <strong>Resources</strong> | Main Report Regional Assessment of <strong>Soil</strong> Changes<br />

279<br />

in Africa South of the Sahara

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