Quantity-intensity ratio of potassium in gypsiferous soils in Iraq

Authors

  • Mijbil Mohammad Al-Jumaily
  • Hudhaifa Maan Al-Hamandi
  • Mohammed Ali Al-Obaidi
  • Radhwan Rafid Al-Zidan

Abstract

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.

KEYWORDS: Exchangeable-K, buffering capacity, labile potassium, Gapon selectivity.

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Author Biography

Hudhaifa Maan Al-Hamandi

Hudhaifa Maan AL-Hamandi

The scientific title :  Assist Professor

Department of Soils and Water Resources

 College of Agriculture

Tikrit University

Email: hudhaifaalhamandi@tu.edu.iq  

 

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Published

2022-07-18

How to Cite

AL-JUMAILY, M. M. .; AL-HAMANDI, H. M. .; AL-OBAIDI, M. A. .; AL-ZIDAN, R. R. . Quantity-intensity ratio of potassium in gypsiferous soils in Iraq. Pesquisa Agropecuária Tropical [Agricultural Research in the Tropics], Goiânia, v. 52, p. e71620, 2022. Disponível em: https://revistas.ufg.br/pat/article/view/71620. Acesso em: 17 jul. 2024.

Issue

Vol. 52 (2022)

Section

Research Article

License

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