Correlation of soil available potassium rapidly analyzed by ion selective electrode and extracted by soil potassium extractants
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Abstract
Precise and rapid tests of potassium (K) in the soil are helpful for precision site-specific K management. Potassium ion-selective electrode (K-ISE) has the potential for rapid K analysis in the field. Still, it needs calibration by correlating with those extracted with soil K extractants. This study aimed to investigate the correlation between K content measured by K-ISE and those extracted with six soil K extractants including NH4OAc, BaCl2, CaCl2, H2O, Kelowna, and Mehlich III) and then measured by atomic absorption spectrophotometer (K-AAS), and between K content measured by K-ISE and forms of soil K (soluble K, exchangeable K, non-exchangeable K, and total K). Seventy agricultural soil samples divided into clayey, loamy, and sandy texture groups were used. Results revealed that K content in most soils was mainly in non-exchangeable form rather than in exchangeable and soluble forms. Potassium contents derived from K-ISE highly significantly had a linear correlation with those from K-AAS. The agreement analysis by the Bland-Altman plot confirmed that the K-ISE method was at an acceptable level of agreement with the K-AAS method. Extracting the soil with Kelowna extractant and determining by K-ISE was more specific to exchangeable K which indicated the availability of soil K. Therefore, K content analyzed by K-ISE can tentatively be used as available K index for K fertilizer recommendation basing on soil test.
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