1. Soil sulphur testing;Anderson;Sulphur Agric.,1992
2. Soil Nutrient Bioavailability: A Mechanistic Approach,1984
3. Mineralisation of nitrogen and sulphur from sheep faeces;Barrow;Aust. J. Agric. Res.,1961
4. Reactions of fertiliser sulphate in soil;Barrow,1975
5. Return of nutrients by animals;Barrow,1987