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Experiments on the effects of phosphate applied to a Buganda soil: I. Pot experiments on the response curve

Published online by Cambridge University Press:  27 March 2009

P. H. Le Mare
P. H. Le Mare
Affiliation:
Cotton Research Corporation, Cotton Research Station, Namulonge, Uganda*
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Summary

In a pot experiment providing for rapid growth of sorghum plants in the red clay loam soils of the Cotton Research Station, Namulonge, in the Buganda Province of Uganda, large yield increases were obtained from added phosphate. In an uncultivated soil which had carried undisturbed natural vegetation (Pennisetum purpureurn)for at least 10 years the response curve had negative curvature throughout. In an arable soil, yields without added phosphate were very poor and the response curve was sigmoid in form. With the arable soil, liming did not modify the form of the response curve for added phosphate but at the heaviest dressing lime decreased yield.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 70 , Issue 3 , June 1968 , pp. 265 - 270
Copyright
Copyright © Cambridge University Press 1968

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References

Le Mare, P. H. (1960). Observations on the phosphate potential of some tropical soils. Trans 7th. int. Congr. Soil Sci. (Madison, Wise, U.S.A.) 3, 600–603.Google Scholar
Manning, H. L. & Ap Griffith, G. (1949). Fertilizer studies in Uganda soils. E. Afr. agric. J. 15, 87–97.Google Scholar
Radwanski, S. A. (1960). The soils and land use of Buganda. A reconnaissance survey. Mew. Res. Div. Dep. Agric. Uganda. Ser. 1. Soils 4.Google Scholar