Binary exchange of calcium, magnesium, potassium and sodium in calcareous soils in Kurdistan region of Iraq

Abstract The objective of this research was to look into the binary exchange in four calcareous soils. ion adsorption carried by Batch equilibrium method used saturate soil samples with sodium, potassium, calcium and magnesium ions, separately, get Sodium–Soil, Potassium–Soil, Calcium–Soil Magnesium–Soil. mean Kd (L kg –1 ) scores various systems were arranged as follows: Calcium – Magnesium (18. 7) > Magnesium– Sodium(18.66) >Magnesium (17.69) Sodium (15.59) Potassium (14.31) (14.26) (6.5) >Potassium (6.32) (5.83) (4.09) (4.01) (3.38).The average values vanselow selectivity coefficients different cation followed order: (9.88) (8.42) (8.31) (5.92) (5.55) (5.34) (3.17) (3.07) (2.93) (2.39) (2.17)> (1.99).