Journal of Soil Science and Environmental Management
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Article Number - A0C09DD55836


Vol.9(1), pp. 1-12 , January 2018
https://doi.org/10.5897/JSSEM2017.0666
ISSN: 2141-2391


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Full Length Research Paper

Potassium adsorption characteristics of five different textured soils under enset (Ensete ventricosom cheesman) farming systems of Sidama zone, South Ethiopia



Kibreselassie Daniel Auge
  • Kibreselassie Daniel Auge
  • Department of Plant and Horticulture Science, Hawassa University, Ethiopia.
  • Google Scholar
Tekalign Mamo Assefa
  • Tekalign Mamo Assefa
  • Ministry of Agriculture, Ethiopia.
  • Google Scholar
Wassie Haile Woldeyohannes
  • Wassie Haile Woldeyohannes
  • Department of Plant and Horticulture Science, Hawassa University, Ethiopia.
  • Google Scholar
Bizuayehu Tesfaye Asfaw
  • Bizuayehu Tesfaye Asfaw
  • Department of Plant and Horticulture Science, Hawassa University, Ethiopia.
  • Google Scholar







 Received: 27 October 2017  Accepted: 12 December 2017  Published: 31 January 2018

Copyright © 2018 Author(s) retain the copyright of this article.
This article is published under the terms of the Creative Commons Attribution License 4.0


A laboratory study was conducted to determine the potassium (K) adsorption characteristics of five soils under enset (Ensete ventricosom cheesman) farming system in Sidama. Potassium adsorption isotherms were constructed by equilibrating 5 g soil samples with 5 levels of K (0 to 78mg/L) as KCl in 10 mmoles/L CaCl2 solutions. Suspensions were shaken for half an hour. Adsorption data were fitted to Freundlich, Langmuir and Temkin adsorption equations. On an average, amount of K adsorbed ranged from 29.2 to 67.82% of added K. Significant positive relationship existed among percent K adsorbed, CEC, percent clay and pH. Langmuir equation gave a better fit of equilibrium K adsorption data for sandy clay loam and silty clay loam soils, while Freundlich equation gave a better fit for clay and loam soils. Furthermore, Temkin isotherm gave a better fit of equilibrium K adsorption data for clay loam soil. Sandy clay loam and loam soils had low 1/n values. The n values on the other hand indicated that the sorption is favorable only for these soils. The Freundlich adsorption capacity, kf were found low as compared to available soil potassium. The negative values of Langmuir isotherm maximum monolayer coverage capacity (a) for clay loam and clay soils agreed with the absence of best fit to the model. Sandy clay loam and silty clay loam which indicated best fit had high monolayer coverage. Value of Temkin isotherm equilibrium binding constant (AT) was high for clay loam soil and this was manifested by high coefficient of determination. Low values of constant related to heat of sorption (B) were determined for sandy clay loam and loam whilst clay loam, silty clay loam and clay soils indicated high binding energy (B).

Key words: Sorption isotherm, Freundlich, Langmuir, Temkin model, monolayer coverage, equilibrium binding constant, heat of sorption.

 

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APA Auge, K. D., Assefa, T. M., Woldeyohannes, W. H., & Asfaw, B. T. (2018). Potassium adsorption characteristics of five different textured soils under enset (Ensete ventricosom cheesman) farming systems of Sidama zone, South Ethiopia. Journal of Soil Science and Environmental Management, 9(1), 1-12.
Chicago Kibreselassie Daniel Auge, Tekalign Mamo Assefa, Wassie Haile Woldeyohannes and Bizuayehu Tesfaye Asfaw  . "Potassium adsorption characteristics of five different textured soils under enset (Ensete ventricosom cheesman) farming systems of Sidama zone, South Ethiopia." Journal of Soil Science and Environmental Management 9, no. 1 (2018): 1-12.
MLA Kibreselassie Daniel Auge, et al. "Potassium adsorption characteristics of five different textured soils under enset (Ensete ventricosom cheesman) farming systems of Sidama zone, South Ethiopia." Journal of Soil Science and Environmental Management 9.1 (2018): 1-12.
   
DOI https://doi.org/10.5897/JSSEM2017.0666
URL http://academicjournals.org/journal/JSSEM/article-abstract/A0C09DD55836

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