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The management of potassium (K) necessitates the understanding of K dynamics and assessment of crop-available K reserves. Non-exchangeable K (NeK) could have a substantial impact on plant nutrition, therefore, non-exchangeable potassium release and supplying power of soils from four different soil orders of Haryana, Northwest India was examined. After successive cropping with maize and oats, initial exchangeable K contents of 0.38, 0.22, 0.25 and 0.09 cmol(p + ) kg −1  declined by 23.37%, 27.28%, 29.41% and 27.77% in Alfisols, Inceptisols, Entisols and Aridisols, respectively. The release of non-exchangeable K to plant roots in screen house was compared with K release to nitric, citric and oxalic acids in the laboratory to assess the feasibility of these acids for non-exchangeable K extraction. The amount of K released was quantified as cumulative uptake by maize and oats. Non-exchangeable K released to plant roots ( r  = 0.94;  p  ≤ 0.01) and oxalic acid ( r  = 0.63;  p  ≤ 0.05) were significantly correlated with cumulative K uptake. The initial level of exchangeable K (Ex-K) and cumulative K uptake by maize and oats exhibited strong and significant correlation ( r  = 0.85;  p  ≤ 0.05) signifying that K removal by crops results in the equilibrium among different K pools. The strongly significant relationship between non-exchangeable K released to oxalic acid and plant roots ( r  = 0.92;  p  ≤ 0.01) affirms the reliability of laboratory methods vis-à-vis K release studies.

Non-exchangeable potassium release and supplying power of soils of Haryana, Northwest India