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Studies on soil phosphorus. II. The nature of native and residual phosphorus in some South Australian soils

Published online by Cambridge University Press:  27 March 2009

Colin H. Williams
Colin H. Williams
Affiliation:
Waite Agricultural Research Institute, University of Adelaide, South Australia
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Extract

A study of residual phosphorus in soils resulting from the use of phosphate fertilizers has been made, using a simplification of Ghani's method for the fractionation of soil phosphorus.

In cultivated soils all the residual phosphorus was extractable by successive extractions with 2·5% acetic acid-1% 8-hydroxyquinoline and 0–1 N-sodium hydroxide, and practically all had remained in the inorganic form; very little, if any, change in organic phosphorus was recorded as a result of the application of superphosphate.

In pasture soils (uncultivated) the application of phosphatic fertilizers brought about an increase in both inorganic and organic phosphorus and, in addition, some of the applied phosphate may have entered a form not extractable by the two extractants. The increase in organic phosphorus was not directly proportional to the amount of phosphate applied, as were the increases in the extractable inorganic fractions. It tended to approach a constant value, irrespective of amount and nature of the phosphate applied.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 40 , Issue 3 , July 1950 , pp. 243 - 256
Copyright
Copyright © Cambridge University Press 1950

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References

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