Pakistan Journal of Biological Sciences

Year: 2003 | Volume: 6 | Issue: 5 | Page No.: 505-510
DOI: 10.3923/pjbs.2003.505.510

Determination of Suitable Chemical Extraction Methods for Available Iron Content of the Soils from Edirne Province in Turkey

Aydin Adiloglu

Abstract: The aim of this research was to determine the available iron (Fe) content of the soils of Edirne Province and the most suitable chemical extraction method. Eight chemical extraction methods (0.005 M DTPA+0.01 M CaCl₂+0.1 M TEA; 0.05 M HCl+0.012 M H₂SO₄; 1 M NH₄OAc (pH: 4.8); 0.01 M EDTA+1 M NH₄OAc; 1 M MgCl₂; 0.01 M EDTA+1 M (NH₄)₂CO₃; 0.005 M DTPA+1 M NH₄HCO₃ and 0.001 M EDDHA methods) and six biological indices (dry matter yield, Fe concentration, Fe uptake, relative dry matter yield, relative Fe concentration, relative Fe uptake) were compared. Biological indices were determined with Barley (Hordeum vulgare L.) grown under greenhouse conditions. The highest correlation coefficients (r) were determined to be between 0.005 M DTPA+0.01 M CaCl₂+0.1 M TEA method and biological indices and between 0.005 M DTPA+ 1M NH₄HCO₃ method and biological indices. The correlation coefficients (r) for 0.005 M DTPA+0.01 M CaCl₂+0.1 M TEA method were r:0.621^**; r:0.823^**; r:0.810^**; r:0.433^**; r:0.558^** and r:0.640^** and for 0.005 M DTPA+1 M NH₄HCO₃ method are r:0.618^** ; r:0.520^**; r:0.679^**; r:0.521^**; r:0.492^** and r:0.641^**, (**:p<0.01) respectively. These extraction methods, among all the methods tested were suggested for the determination of available Fe content of Edirne Province soils.