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Nature and availability of residual phosphorus in longterm fertilized pasture soils in New Zealand

Published online by Cambridge University Press:  27 March 2009

L. M. Condron  and
K. M. Goh
L. M. Condron
Affiliation:
Department of Soil Science, Lincoln College, Canterbury, New Zealand
K. M. Goh
Affiliation:
Department of Soil Science, Lincoln College, Canterbury, New Zealand
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Summary

The nature and availability of phosphorus in long-term fertilized pasture soils was investigated in a series of field trials, which included liming, N fertilizer and cultivation and involved monitoring plant P uptake and changes in topsoil (0–7·5 cm) P fractions for 2 years (1982–83). Liming increased soil organic P mineralization. This was indicated by significant decreases in extractable organic P and concomitant increases in microbial biomass P in the limed soils, although these changes in soil P had no significant effect on pasture yield and P uptake. On the other hand, N fertilizer increased pasture yield and P uptake but had little effect on the amounts of P in the different soil P fractions. In the cultivated soils, increases in plant-available inorganic P were attributed to the release of P during decomposition of plant residues, while the maintenance of fallow conditions decreased amounts of microbial P in these soils.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 114 , Issue 1 , January 1990 , pp. 1 - 9
Copyright
Copyright © Cambridge University Press 1990

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