1. Balasubramanian, K. A., Influence of nitrogen and phosporus fertilizers on the expression of downy mildew of sorghum. Plant and Soil38, 477–479 (1973).
2. Chapman, H. D. and Pratt, D. F., Methods of analysis for soils, plants and water. Univ. Calif. Div. Agric. Sci. Berkley (1961).
3. Chupp, C., The effects of potash, phosphorus on the tip burn and mildew of cabbage. Phytopathology20, 307–318 (1940).
4. Colhoun, John, Effects of environmental factors on plant diseases Annu. Rev. Phytopathol.11, 343–364 (1973).
5. Ghabrial, S. A. and Pirone, T. P., Effect of mineral nutrition on host reaction toCladosporium fulvum. Phytopathology56, 493–496 (1966).