Effect of Ion Pairs on the Dispersion Parameters (SAR, MCAR, CROSS) of some Calcareous and Saline Soils in Nineveh Governorate

The study included selected soils from locations within Nineveh Governorate (Tal-Kaif, Al Hamdaniya, represent calcareous soils),(Rabie’a, Tal-Abta, represent saline soils) three depths were determined for soil sampling (0-20) (20-50) (50-80) cm. The results showed that there was a difference in the effect of dispersion parameters on the structural composition of soil and the degradation of soil properties, where it was observed that the values of the parameters, SAR, MCAR, CROSS were high after correcting the ion pairs values. The increase in the SAR value appeared in calcareous soils at a average of (0.031) and for saline soils at a average of (0.463) after correcting the ion pairs. The MCAR values increased in calcareous soils by (0.025) and saline soils by (0.508) after correcting the ion pairs. CROSS increased in calcareous soils by (0.027) and saline soils by (0.532) after correcting the ion pairs.