Abstract
Fertility status of some calcareous soil in Nineveh governorate North Iraq. were evalued studying K buffering capacity using Beckett method. The thermodynamic parameter included intensity factor, (DK) amount of adsorbed K as quantity factor (PBCK) and free energy (-∆G), The results showed (ARKe) ranged between 28-353 (mole.L-1) and 71-355 (mole.L-1)- 1/2without and with the addition of sulfur respectively. The results for K- desorption ranged 102-28 (mole.L-1)-1/2 and 112-68 (mole.L-1)-1/2 for the some trend mentioned. potassium potential Buffering Capacity (PBCK) were ranged between (201-31),(236-1483) after adsorption experiment and (239 -169), (146-2469) C. mole.K (mole.L)-1/2 after desorption experiment for treatment, without and with sulfur respectively. The results free for energy of potassium replacement ranged between (-3480,-3342), and (-3339,-4292),(-4066 -3480) and (-4022, -2954) Cal.mole-1 for potassium adsorption and desorption after sulfur application respectively. The result showed sulfur has a significant increasing on potassium availiabity parameter. Accordingly, the study revealed that sulfur has a singifant effect on K availabity.
