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

Sohail Jamil, Ayaz Mehmood, Mohammad Saleem Akhtar, Mehrunisa Memon, Muhammad Imran, Shah Rukh, Abdul Qayyum, Matthew A. Jenks

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


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 (380-590 mg kg−1) in all cases, followed in decreasing abundance by iron oxides surfaces adsorbed phosphorus (Fe-P), octacalcium phosphates (Ca8-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.

Original languageEnglish (US)
Pages (from-to)1567-1577
Number of pages11
JournalArchives of Agronomy and Soil Science
Issue number11
StatePublished - Nov 1 2016


  • Apatite
  • estuary plains
  • soil development
  • toposequence

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Soil Science


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