1. Chemical methods of soil analysis;Atkinson,1958
2. Interpreting tillage residue management effects;Benoit;J. Soil Water Conserv.,1987
3. Effect of crop rotation and fertilization on some biological properties of a loam in southwestern Saskatchewan;Biederbeck;Can. J. Soil Sci.,1984
4. Soil property changes associated with crop residue management in a wheat-fallow rotation;Black,1973
5. Soil organic carbon nitrogen and fertility;Campbell,1978