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Original Articles

Advisory Soil or Plant Analysis and Fertilizer Use I—Comparison of Soil Analysis Methods

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Pages 117-137 | Received 15 Sep 1967, Published online: 11 Dec 2015

References

  • Robinson, J. B. D. (1968). A simple available soil nitrogen index. Part II. Field crop evaluation. J. Soil Sci., 19, 280–290.
  • Scott, R. M. (1962). The Soils of East Africa. In the Natural Resources of East Africa. Ed. Russell, E. W., Pub. by D.A. Hawkins Ltd., in association with E.A. Lit. Bureau, Nairobi, pp. 67–76 (with map and key).
  • Robinson, J. B. D. (1968). Measuring soil nitrogen available to crops in East Africa. E. Afr. agric. for. J., 33, 269–280 (tables II and III).
  • Saggerson, E. P. (1962). The geology of East Africa. In the Natural Resources of East Africa. Ed. Russell, E. W. Pub. by D. A. Hawkins Ltd, in association with E.A. Lit. Bureau, Nairobi. pp. 52–66 (with map and key).
  • Egnér, H., Riehm, H. and Domingo, W. R. (1960). Untersuchungen uber die chemische Bodenanalyse als Grundlage fur die Beurteilung des nährstoffzustandes der Böden. II. Chemische Extraktions methoden zur Phosphor und Kaliumbestimmung. Kungl. Lantbrukshögskolans Annaler. 26, 199–215.
  • Truog, E. (1930). The determination of readily available phosphorus of soils. J. Am. Soc. Agron., 22, 874–892.
  • Mehlich, A., Pinkerton, A., Robertson, W. and Kempton, R. (1962). Mass analysis methods for soil fertility evaluation. Dept. of Agric., Kenya, Cycl. Rept. pp. 10.
  • Watanabe, F. S. and Olsen, S. R. (1965). Test of an ascorbic acid method for determining phosphorus in water and sodium bicarbonate extracts from soil. Soil Sci. Soc. Am. Proc., 29, 611–618.
  • Waugh, D. L. (1966). Ann. Rept. 1966. International Soil Testing. Fertilizer requirements of countries in Latin America. U.S.A.I.D. (no further detail).
  • Friend, M. T. (1964). The determination of exchangeable cations. E.A.A.F.R.O. Soil Analysis Method Sheet, pp. 5.

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