Quantity-intensity ratio of potassium in gypsiferous soils in Iraq
2022
Mijbil Mohammad Al-Jumaily | Hudhaifa Maan Al-Hamandi | Mohammed Ali Al-Obaidi | Radhwan Rafid Al-Zidan
In gypsiferous soils, potassium (K) undergoes leaching, precipitation and other reactions that reduce its availability. This study aimed to evaluate the physicochemical behavior of K in gypsiferous soils of the Salahaddin province (Iraq), in twelve locations chosen according to the variation in their soil physical and chemical properties. The K adsorption phenomenon was described by using thermodynamic parameters according to the quantity-intensity ratio (Q/I), with the following results: equilibrium activity ratio of 16 to 48 x 10-5 (mol L-1)1/2, total labile K of 19 to 80 x 10-3 cmolc kg-1, potential buffering capacity of 22 to 42 cmolc kg-1 (mol L-1)-1/2, free energy of exchange of -1.237 to -1.086 kJ mol-1 and Gapon selectivity coefficient of 3.86 to 5.45 (L mol-1)1/2. All the investigated soils are characterized by good potassium reserves, but low in release.
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