Phosphorous sorption in some great soil groups of semi-arid region of Turkey

Bilgili A. V. , Uygur V., Karaca S., USTA S., Dengiz O., Aydemir S.

International Journal of Soil Science, vol.3, no.2, pp.75-82, 2008 (Peer-Reviewed Journal) identifier

  • Publication Type: Article / Article
  • Volume: 3 Issue: 2
  • Publication Date: 2008
  • Doi Number: 10.3923/ijss.2008.75.82
  • Journal Name: International Journal of Soil Science
  • Journal Indexes: Scopus, Biotechnology Research Abstracts, Pollution Abstracts
  • Page Numbers: pp.75-82
  • Keywords: Adsorption, Calcareous soils, Langmuir isotherm, Phosphorous, Precipitation


Removal of fertilizer phosphorous by adsorption and precipitation processes is an important factor for yield loss in low input soils of arid and semi-arid regions. The phosphate sorption characteristics of surface and subsurface horizons of four semi-arid region soils and their relationships with soil chemical and physical properties were investigated. Two sorption sites were identified. The adsorption capacity was greater for region 1 while bonding energy was higher for region 2 sites. The adsorption maxima (b1) of the low concentration range (region-I) was 625-1250 μg P/g and adsorption energy coefficient k1 ranged between 0.159-0.800 mL μg -1. The calculated b and k values of high concentration range (region-II) were not treated as real adsorption parameters, because as the concentration increased, the data weakly confirmed Langmuir isotherm. This revealed the fact that Langmuir isotherm can be applied to phosphorous adsorption in soils and soil materials to a limited extent. Adsorption maximum of soils for P were found to be greater for soils and horizons high in CaCO 3, clay and CEC. Statistically significant positive relationships were found between adsorption maximum and CaCO3, clay and CEC whereas important negative relationships were found between adsorption capacity and organic matter, sand, Fe2O3 and Al2O 3 content of soils. © 2008 Academic Journals Inc.