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RESEARCH ARTICLE
Contents Vol 45(4)

Relationship between phosphorus fractions and properties of highly calcareous soils

Ebrahim Adhami A D , Hamid Reza Memarian B , Farzad Rassaei B , Ehsan Mahdavi B , Manouchehr Maftoun B , Abdol-Majid Ronaghi B and Reza Ghasemi Fasaei C
+ Author Affiliations
- Author Affiliations

A Department of Crop Science, College of Agriculture, Yasouj University, Yasouj, Iran.

B Department of Soil Science, College of Agriculture, Shiraz University, Shiraz, Iran.

C College of Agriculture and Natural Resources, Shiraz University, Darab, Iran.

D Corresponding author. Email: eadhami@gmail.com

Australian Journal of Soil Research 45(4) 255-261 https://doi.org/10.1071/SR06118
Submitted: 31 August 2006  Accepted: 19 May 2007   Published: 28 June 2007

Abstract

Inorganic phosphorus (P) sequential fractionation schemes are applicable techniques to interpret soil P status. The present study was initiated to determine the origin of various P fractions in highly calcareous soils. Inorganic P forms were determined by a sequential fractionation procedure extracting with NaOH (NaOH-P), Na citrate-bicarbonate (CB-P), Na citrate 2 times (C1-P and C2-P), Na citrate-ascorbate (CAs-P), Na citrate-bicarbonate-dithionite (CBD-P), Na acetate (NaAc-P), and HCl (HCl-P). Results showed that NaOH-P was negatively correlated with active iron oxides. CB-P was positively correlated with silt content and negatively related to citrate-bicarbonate-dithionite extractable Fe (Fed). This result illustrates the weathering effect on Ca-P, with Ca-P content declining as a consequence of weathering. A negative correlation was observed between C1-P and citrate ascorbate extractable Fe (FeCAs). Second citrate extractable P (C2-P) was negatively related to calcium carbonate equivalent and positively related to hydroxylamine-hydrochloride and neutral ammonium acetate-hydroquinone extractable Mn (Mnh and Mnq). Fine silt (Fsilt) was the most influential factor affecting CAs-P. It seemed citrate-dithionite-bicarbonate extractable Al (Ald), Mnh, and Mnq have been sinks for CBD-P, while free iron oxide compounds (Feo, Fec, and FeCAs) were a major contributing factor for the formation of NaAc-P. Stable P compounds (HCl-P) of highly calcareous soils originated from coarse silt (Csilt) and hydroxylamine-hydrochloride extractable Mn (Mnh).

Additional keywords: silt, Ca phosphate, Fe, Al and Mn phosphates, Fe, Al and Mn minerals.


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