Effects of soil properties on phosphorus fractions in subtropical soils of Iran

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Author(s)
Adhami, E
Owliaie, HR
Molavi, R
Rezaei Rashti, M
Esfandbod, M
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Ebrahim Adhami ,Hamid Reza Owliaie, Roya Molavi, Mehran Rezaei Rashti, Maryam Esfandbod

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2013
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Abstract

The distribution of inorganic P fractions and their relationships with soil properties was studied in 17 slightly acidic to slightly alkaline soils (pH range 5.37 to 7.61). The soils were selected from agricultural fields of the north of Iran. Inorganic P fractionation included successive extraction with NaOH (NaOH-P), citrate-bicarbonate (CB-P), citrate two times (C1- and C2-P), Citrate-ascorbate (CAs-P), citrate-dithionite-bicarbonate (CBD-P), sodium-acetate buffer (NaOAc-P) and HCl (HCl-P). Results showed that the abundance of P fractions was in the order NaOH-P (35.67 mg kg-1) , NaOAc-P (39 mg kg-1), C2-P (49 mg kg-1), CBD-P (102 mg kg-1), CB-P (136 mg kg-1), CAs-P (156 mg kg-1), C1-P (197 mg kg-1), HCl-P (417 mg kg-1). Among soil properties, pH had almost a linear negative relationship with NaOH-P and a linear positive relationship with HCl-P; in addition, it significantly affected C1-P, CAs-P and NaOAc-P. Oxalate extractable Fe showed a significant positive correlation with NaOH-P and CAs-P, while calcium carbonate equivalent (CCE) had a significant positive correlation with NaOAc-P and HCl-P.

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Journal of soil science and plant nutrition

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13

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1

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© The Author(s) 2013. This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial 3.0 Unported (CC BY-NC 3.0) License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted, non-commercial use, distribution and reproduction in any medium, providing that the work is properly cited.

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Soil sciences

Soil chemistry and soil carbon sequestration (excl. carbon sequestration science)

Agriculture, land and farm management

Agricultural systems analysis and modelling

Crop and pasture production

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