Phosphorus Adsorption and its Relation with Soil Properties in Calcares Soil of Basra City


Najla J. AL-Amiri
Department of soil sciences and water resources, College of Agriculture, University of Basra, Iraq.


Soil samples from ten different parts in Basra were collected as: Qurna, Medayna, Diar, Hartha, Garmat Ali, Basra University, Brahdia, Tanoma, AbulKhaseeb and Seeba. The physic-chemical properties of these calcareous soil sites were found to be low organic matter and very high ECe and active carbonate. The laboratory work is done by weighting 2.5g. from each soil and put them in 50ml conical flask. Then added phosphorus in form of phosphate mono potassium KH2PO4 on nine levels as follows:(0,50,100,150,200,250,300,350,400)µml-1. Meanwhile, the treatments were shake and left till equilibrium. After that procedure, it was determined the soluble phosphorus after equilibrium and calculated adsorbed quantity of phosphorus on soil surfaces. The results are tested by linear Langmuir equation and calculation the constants of this equation, (b , k ) . The results showed that the greatest adsorption values of Diar and Tanoma soils were greater than other soils. The soil Electrical conductivity , clay and solid carbonat especially active carbonat gave high significant coefficient of (R2) with adsorption maxima of phosphorus (b).