REFERENCES
- Hardy, F. (1923).—The physical signficance of the shrinkage co-efficient of clays and soils, J. Agric. Sci., 13, 243–265.
- Keen, B. A., et al.—Studies in soil cultivation J. Agric. Sci. Eleven papers from 1930 onwards.
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- Keen, B. A. and Raczkowski, H. (1921).—The relation between the clay content and certain physical properties of a soil. J. Agric. Sci., 11, 441–449.
- Kerr, A. J. (1942).—A new system of grass fallow strip-cropping for the maintenance of soil fertility. Emp. J. Expt. Agric., 10, 125–132.
- Martin, E. F. and Badcock, W. J. (1937).—Preliminary studies on grasses and grazing at Ngetta. E. Afric. Agric. J., 3, 192–195.
- Martin, W. S. and Biggs, C. E. J. (1937).—Experiments on the maintenance of soil fertility in Uganda. E. Afric. Agric. J., 2, 371–378.
- Martin, W. S. (1944).—Grass covers in their relation to soil structure. Emp. J. Expt. Agric., 11.
- Nye, G. W. (1937).—Preliminary notes on the use of elephant grass as a fallow crop in Buganda. E. Afric. Agric. J., 3, 186–190.
- Tiulin, A. F. (1928).—Questions on soil structure. II Aggregate analysis as a method of determining soil structure. Perm Agric. Expt. Sta. Div. Agric. Chem., 2, 77–122.
- See also Russell, E. W. (1938).—Soil structure. Imp. Bur. Soil Sci. Tech. Commun.