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Vol. 3 No. 01 (2022)

Articles

Potassium Mobility Potential of Forest Soil In Kurdistan Region, Iraq, As Estimated By Quantity- Intensity (Q/I) Relationships

https://doi.org/10.38094/jastt301168

Published 2022-06-27

  • Ghafoor A. Mam-Rasul
    • ,
  • Shuela M. Sheikh-Abdullah

Ghafoor A. Mam-Rasul
Department of Natural Resources, College of Agricultural Engineering Sciences, University of Sulaimani, Kurdistan Region of Iraq

Shuela M. Sheikh-Abdullah
Department of Natural Resources, College of Agricultural Engineering Sciences, University of Sulaimani, Kurdistan Region of Iraq

Abstract

This study aimed to assess potassium(K) 's potential mobility for some soils located in the Kurdistan Region of Iraq. Five soil samples were collected from a depth of (0-30) cm. For each sample, 5g of soil was equilibrated with 50 ml of 0.01 M CaCl2, amended with different K concentrations, and incubated for 24 h at 298 Kelvin. The supernatant was filtered, and K, Ca, and Mg were determined. Potassium exchange equilibrium was calculated from quantity-intensity (Q/I) isotherms. Mean AReK values for all studied soils ranged between 2.4x10-3 to 3.6x10-3(mol L-1)1/2, which reveals that K was preferentially held at inner potions. The amount of labile K(KL) ranged from 0.479 to 1.191cmolc kg-1 in studied soils. The highest value of KL was in Kanypanka while the lowest value was in Goizha. The potential buffering capacity (PBCK) was between 619.56 and 857.37 cmolc kg-1(mol L-1) -1/2. All studied soils were characterized by low percent K saturation and a high ability to replenish K concentration in the soil solution. Gapon selectivity coefficient was relatively high and ranged from 5.64 to 7.88 L mol-1. Higher values of KL indicate a greater K release into the soil solution. Such a high affinity of K for the solid soil phase was attributed to both the elevated organic matter content in these soils and their strong buffering capacities.

Keywords

Forest soils, Gapon selectivity coefficient, labile K, Potential buffering capacity, Potassium quantity-intensity isotherms

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