4.4 Article

Changes in soil phosphorus fractions across a toposequence in the estuary plains of Pakistan

Journal

ARCHIVES OF AGRONOMY AND SOIL SCIENCE
Volume 62, Issue 11, Pages 1567-1577

Publisher

TAYLOR & FRANCIS LTD
DOI: 10.1080/03650340.2016.1155701

Keywords

Apatite; estuary plains; soil development; toposequence

Funding

  1. Higher Education Commission of Pakistan

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Understanding the regional dynamics of soil phosphorus (P) chemistry is essential for developing the best fertilizer management practices aimed at enhancing P use efficiency in cropping systems. The soil content of apatite, an important P-containing lithogenic mineral, can be influenced by its position in the local relief of a landscape. The objective of this study was to determine quantitative distribution of various P-forms in estuary plains of southern Pakistan in relation to soil genesis. Soils at different positions within the estuary plain were sampled at various genetic horizons. Apatite-P was the most abundant inorganic P constituent (380-590mgkg(-1)) in all cases, followed in decreasing abundance by iron oxides surfaces adsorbed phosphorus (Fe-P), octacalcium phosphates (Ca-8-P), aluminum oxides with surface bound P (Al-P) and the least abundant was the phosphorus occluded in iron oxides mineral (Occl-P). The abundance of apatite-P and these other forms of secondary phosphate varied for the soils at different relief positions in these estuary plain landscapes.

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