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Fertility Studies on a Sandy Loam in Semi-Arid Tanzania

I. Effects of Nitrogen, Phosphorus and Potassium Fertilizers on Yields of Maize and Soil Nutrient Status

Published online by Cambridge University Press:  03 October 2008

G. D. Anderson
G. D. Anderson
Affiliation:
Ministry of Agriculture and Co-operatives, Tanzania*
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Summary

N and P fertilizers applied to maize had considerable effects over a five-year period, especially when both were given. Initial applications of 47 lb/acre/P2O5 with annual dressings of 58 lb N, produced a mean yield increase of 55 per cent above the control. K gave little response in the first three years, but thereafter became more important. 1120 lb ammonium sulphate nitrate caused striking reductions in soil pH, Ca, Mg, K, total and organic P but increases in exch. Mn and soluble P. 112 lb double superphosphate increased the total and organic P and 65 lb K2O reduced organic P. Organic carbon suffered a mean loss of 33 per cent over five years. Recommendations are made regarding P2O5, N and K on this soil.

Type
Research Article
Information
Experimental Agriculture , Volume 6 , Issue 1 , January 1970 , pp. 1 - 12
Copyright
Copyright © Cambridge University Press 1970

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