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- Soil conservation -- South Africa -- Swartland 1
- Soil degradation 1
- Soil enzymology 1
- Soil erosion -- South Africa -- Swartland 1
- Soil fertility 2
- Soil inoculation 1
- Soil liquefaction -- Testing 1
- soil management 1
- Soil pollution 1
- Soil pollution -- Health Aspects 1
- Soil productivity 1
- Soilless culture 1
- Soilless media 1
- Soils -- Environmental aspects -- South Africa 1
- Soils -- Heavy metal content 3
- Soils -- Heavy metal content -- South Africa 1
- Soils -- Leaching 1
- Soils -- Manganese content 1
- Soils -- Polycyclic aromatic hydrocarbon content 1
- Soils -- Quality -- South Africa 1