DESCRIPTION OF MAGNESIUM ADSORPTION UNDER THE INFLUENCE OF DIFFERENT TEMPERATURES IN CALCAREOUS SOILS WITH VARIED AGRICULTURAL USES

In order to study the effect of temperature on magnesium adsorption in different calcareous soils, adsorption equations such as the Langmuir, Freundlich and Temkin equation were used to describe the adsorption process. The study was conducted on five different agricultural exploitation sites in Nineveh Governorate - Iraq, and each site was divided into two depths (surface, subsurface). the study was conducted at three temperatures (278, 298, 318 Kelvin), when comparing these equations through the values of (R2) and (SE), the Langmuir equation outperformed both the Freundlich and Temkin equations in the first place, while the Temkin equation in the last place, some functions derived from the Langmuir equation were studied (maximum adsorption capacity, binding energy, maximum buffering capacity, the results of the study showed that the effect of temperature on the maximum adsorption capacity values was negatively related to the equilibrium temperature (R2=91), when the temperature increased from 278 to 298 K, it led to a decrease in the maximum adsorption capacity by 18.89%, as for the effect of temperature on the average binding energy values, there was a weak positive correlation between the average binding energy values and the equilibrium temperatures (R2=0.006), when the temperature increased from 278 to 298 K, it led to an increase in the average binding energy by 74.39%, and increasing the temperature from 278 to 318 K led to an increase in the average binding energy by 6.76%. while the effect of temperature on the maximum buffering capacitance values didnot have a consistent pattern.