A Study of the Quantity and Intensity Relationship of Potassium in Some Soils of Thi- Qar Province, Southern Iraq

Authors

  • Reiyadh Bedeeh Department of Soil Sciences and Water Resources, College of Agriculture, University of Sumer, Al-Refaee, Iraq
  • Hussein Chlaib Department of Soil Sciences and Water Resources, College of Agriculture, University of Sumer, Al-Refaee, Iraq.
  • Hakeem Zachi 3Department of Animal Production, College of Agriculture, University of Sumer, Al-Refaee, Iraq.
  • Jallal Ali Department of Soil Sciences and Water Resources, College of Agriculture, University of Sumer, Al-Refaee, Iraq.

Keywords:

Potential Buffering Capacity, Free Energies, Gapon Selectivity Coefficient, Equilibrium Activity Ratio

Abstract

The study aims to use thermodynamic criteria derived from intensity and quantity relationships to estimate the supply capacity of potassium for selected soils from agricultural and non-agricultural sites northern of Dhi-Qar Governorate/ southern Iraq. Results of thermodynamic criteria in this study showed that all studied soils were low in the K-availability , the value of the activity of potassium (ARK0) ranged widely from (6.14 - 10.83 )×10-4 in agricultural soils to 3.35 - 6.57× 10-4 (mol. L-1 )0.5 in non-agriculture  soils , labile KL (ΔK0) (6.64 -7.17) and (7.02 - 8.25) cmol .kg-1,and the potential buffering capacity (PBCK) 64.51 – 113.10×10-2 cmol. kg-1 (mol. L-1 ) 0.5 , and 110 - 245 cmol. kg-1   (mol. L-1 ) 0.5, and the Gapon Selectivity Coefficient (KG)  0.028  - 0.048 ,and 0.041 – 0.100    (mol. L-1 ) 0.5, and the Free Energy (-∆G) range between -4044 to - 4380 ,and -4340  to -4739  Cal.mole-1for agriculture and non-agriculture respectively. The study provided more accurate information about the dynamics potassium of soil that plays an important role in describing the behavior of potassium in the saline soils of southern Iraq.

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Published

2025-06-28

Issue

Vol. 4 No. 1 (2025): Vol. 4 No. 1 (2025)

Section

Biology