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Soil phosphate values in relation to phosphate supply to plants from some Nigerian soils

Published online by Cambridge University Press:  27 March 2009

B. W. Bache  and
N. E. Rogers
B. W. Bache
Affiliation:
Department of Soil Fertility, Macaulay Institute, for Soil Research, Aberdeen
N. E. Rogers
Affiliation:
Institute for Agricultural Research, Ahmadu Bello University, Zaria, Nigeria
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Summary

Phosphate uptake and dry-matter yield from unfertilized pots and relative yield (ratio of unfertilized to fertilized yield) of Rhodes grass were used as plant indices of P supply from twenty-four soil samples from long-term manurial trials in Nigeria. Although measurements of the soil P quantity factor were generally the more important, intensity measurements also made a highly significant independent contribution to the P supply. Inorganic P (a quantity measure) combined with the log of P concentration in a saturation water extract (an intensity measure) gave a multiple correlation coefficient of R = 0·954*** with relative yield, accounting for 91% of its variation. The best single measure was resin-extractable P, which gave r =0·930*** for correlation with relative yield. Organic P did not appear to contribute to plant growth.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 74 , Issue 2 , April 1970 , pp. 383 - 390
Copyright
Copyright © Cambridge University Press 1970

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