Abstract
THE authors of a letter under this title which appeared in Nature of March 5, p. 362, seem to be unaware how much is known about the manuring of Egypt's chief crop, and about the soil in which it grows.
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Gracie, D. S., et al., "The Nature of Soil Deterioration in Egypt", Min. Agric. Tech. Bull. 148 (Cairo, 1934).
Gracie, D. S., and Khalil, F., "An Analysis of the Factors Governing the Response to Manuring of Cotton in Egypt", Min. Agric. Tech. Bull. 152 (Cairo, 1935). Cited on p. 362.
Gracie, D. S., and Balls, W. L., "Dibble-Sowing of Cotton; Method, Effects and Profits", Min. Agric. Tech. Bull. 229 (Cairo, 1939).
Gracie, D. S., Balls, W. L., and Khalil, F., "Evaluating the Effect of Nitrogenous Fertilisers by Combining Statistical (1904–1940) and Agronomic Data", Min. Agric. Tech. Bull. 249 (Cairo. 1948).
Gracie, D. S., and Khalil, F., "The Total and Available Phosphoric Acid in Egyptian Soils, and the Effect of Superphosphate on the Main Agricultural Crops", Min. Agric. Tech. Bull. 251 (Cairo, 1948).
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BALLS, W. Cotton Crop Yield in Relation to the Application of Fertilizers. Nature 163, 452 (1949). https://doi.org/10.1038/163452a0
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DOI: https://doi.org/10.1038/163452a0
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