1. Influence of tillage practices on clod size, porosity and water retention;Bhushan;Indian Journal of Agricultural Sciences,1973
2. The effect of organic matter on the structure of clay soils;Boekel;Netherlands Journal of Agricultural Sciences,1963
3. The efficiency of aggregation indices in the comparison of some English and Canadian Soils;Bryan;Journal of Soil Science,1971
4. Estimating bulk density from organic matter content in some forest soils;Curtis,1964
5. Changes in nitrogen status and physical conditions of soils under pastures;Greenland;Soils and Fertilizers,1971