THE DYNAMIC BEHAVIOR OF POTASSIUM IN SOME DIFFERENT AGRICULTURAL SOILS IN NINEVEH GOVERNORATE

Abstract

Quantity intensity parameters were used to evaluate the dynamics of potassium in soils under the management of different agricultural use. Sixteen soil samples were collected from Nineveh Governorate to study the forms of potassium relationship of different forms of in these soils, i.e., available, water-soluble, exchangeable, were ranged from (0.005-0.272),( 0.486 to 1.252) and (0.749 to 2.355), respectively. In general, the quantity/intensity (Q/I) of K may serve as an index for the intensity and quantity of effective K supply to plants in soils. the quantity-Intensity relationship of Potassium was studied to quantify potassium release for the studied soils. results showed, potassium activity ratio (AReK) is related to changes with labile potassium (±ΔK) at equilibrium and increased together with increasing potassium concentrations, and it is ranged between (3.91 and 24.21)×10-3 (mol.L-1)1/2. The range of labile K+(KL) values is equal to (0.18- 0.61) cmol.kg-1, respectively, while the K+ (PBCK) was from 21.78 to 45.93 cmol.kg-1 (mol.L−1)−1/2, The Free energy in the (−ΔG) ranged from -0.79 to -0.53 kJ.mol-1.and Gapon Selectivity Coefficient (kG) ranged from 0.93 to 1.65 (mol.L-1)1/2. Therefore, this information may be used as references for potassium soil fertilization. The study provided more accurate information about the potassium dynamics of the soils and play a significant role in the behavior of potassium. The results of the statistical analysis showed a positive and significant correlation between potassium forms and some thermodynamic parameters of potassium and some soil properties, while the correlation was negative between these forms and CaCO3. Keywords: (Q/I) characteristics, agricultural soils in Nineveh, buffering capacity, Potassium dynamicsQuantity intensity parameters were used to evaluate the dynamics of potassium in soils under the management of different agricultural use. Sixteen soil samples were collected from Nineveh Governorate to study the forms of potassium relationship of different forms of in these soils, i.e., available, water-soluble, exchangeable, were ranged from (0.005-0.272),( 0.486 to 1.252) and (0.749 to 2.355), respectively. In general, the quantity/intensity (Q/I) of K may serve as an index for the intensity and quantity of effective K supply to plants in soils. the quantity-Intensity relationship of Potassium was studied to quantify potassium release for the studied soils. results showed, potassium activity ratio (AReK) is related to changes with labile potassium (±ΔK) at equilibrium and increased together with increasing potassium concentrations, and it is ranged between (3.91 and 24.21)×10-3 (mol.L-1)1/2. The range of labile K+(KL) values is equal to (0.18- 0.61) cmol.kg-1, respectively, while the K+ (PBCK) was from 21.78 to 45.93 cmol.kg-1 (mol.L−1)−1/2, The Free energy in the (−ΔG) ranged from -0.79 to -0.53 kJ.mol-1.and Gapon Selectivity Coefficient (kG) ranged from 0.93 to 1.65 (mol.L-1)1/2. Therefore, this information may be used as references for potassium soil fertilization. The study provided more accurate information about the potassium dynamics of the soils and play a significant role in the behavior of potassium. The results of the statistical analysis showed a positive and significant correlation between potassium forms and some thermodynamic parameters of potassium and some soil properties, while the correlation was negative between these forms and CaCO3.