Investigating the quantity-intensity (Q/I) parameters of potassium in the soil affected by the addition of minerals and humic acid

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Document Type : Research Paper

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Department of Soil Science, Faculty of Agriculture, Razi University, Kermanshah, Iran

Abstract

This study was conducted to investigate the effect of using bentonite, vermiculite, and zeolite saturated by sodium and calcium with and without humic acid on the parameters of potassium quantity-intensity relationship in a loamy soil. The amendments saturated by calcium and sodium were added separately to 400-g soil samples at the rate of 1% and 2% (w/w). For each treatment containing mineral amendment, two levels of humic acid application (0 and 0.5% w/w) were considered. After the end of a two-month incubation, adsorption isotherm tests were performed using solutions containing concentrations of 0.3, 0.6, 1.2, 1.8, 2.4, 2.7, and 3 mM potassium chloride and 10 mM calcium chloride and Q/I parameters were obtained. The highest and lowest values of AReK were related to 1% Ca-Z and 2% Na-B + 0.5% HA treatments, respectively. There was a negative and significant correlation between AReK and PBCK and CEC. The PBCK varied in the range of 59.4-174.1 (cmolc kg-1) (mol L-1)-1.2 and the highest and lowest values were obtained in 2% Na-Z + 0.5% HA and 1% Ca-B treatments, respectively. The PBCK decreased in 1% Ca-B, 2% Ca-B, 1% Ca-V, and 1% Ca-Z treatments compared to the control. These treatments have less power than the control in regulating the intensity factor during the discharge of soluble potassium. Therefore, they can be beneficial for the quick supply of potassium to the plant. However, they are weaker than the untreated soil in maintaining and providing potassium in the long term.

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Iranian Journal of Soil and Water Research

Articles in Press, Accepted Manuscript
Available Online from 15 October 2024

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