Potassium Release Kinetics as Influenced by Time and Parent Materials in Parts of Akwa Ibom State, Nigeria Potassium Release Kinetics as Influenced by Time and Parent Materials in Parts of Akwa Ibom State, Nigeria – Direct Research Journal of Agriculture and Food Science
Original Research Article

Potassium Release Kinetics as Influenced by Time and Parent Materials in Parts of Akwa Ibom State, Nigeria

Umoh, F. O.*
Uduak, I. G.
Ekanem, C. E.
Article Number: DRJAFS48969162
DOI: https://doi.org/10.26765/DRJAFS48969162
ISSN: 2354-4147

Vol. 10(10) Pp. 233-240 October 2022

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Abstract

The goal of the study was to evaluate potassium (K) release in soils derived from three parent materials (shale, sandstone, and alluvium soils), and to identify the best-fitting equations to describe K release to 0.01M CaCl2 extraction over the course of 1–128 hours at various concentrations of added K ranging from (0, 50, 100, 150, 200mgL-1K). Two gram (2g) soil suspended in 20 ml of 0.01M CaCl2 was shaken at 250C on a reciprocating shaker and subsequently centrifuged. The K concentration in the supernatant was determined. Potassium release with time was modeled using zero and first order equations. The results revealed a sharp increase in K release from 0mgL-1 to 50mgL-1 in the soils. The highest concentration was found in alluvial soil, while the lowest concentration was found in shale soil. In zero order equations, the trends were Alluvium 146.3 > sand stone 108 > shale 72.27 mgkg-1 and in first order equations, Alluvium 5.308 > sand stone 4.983 > shale 4.557mgkg-1. The concentration of K released in the soil increased as time passed in the soils. The results also revealed that the zero order equation adequately described the K release reactions, with the highest mean R2 values of 0.997.

Keywords: Potassium, parent material, kinetics released, first order equation, zero order equation, texture
 Received: August 5, 2022  Accepted: September 19, 2022  Published: October 1, 2022


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