JWSS - Journal of Water and Soil Science

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Quantity-Intensity (Q/I) curves and their derived parameters provide general information about soil Potassium (K) availability. This investigation was conducted to obtain K different varieties and their correlations with K, Q/I parameters in 13 soils sample from Bahar area as the major potato producing area in Iran. Soil Samples were equilibrated with solution containing different potassium activity ratios (ARK), and changes in potassium concentrations in the equilibrium solution (ΔK) were ploted against activity ratio of K, and Q/I parameters were determined. The results showed that, potassium activity ratio at equilibrium (AR0) ranged from 0.007 to 0.995 with an average of 0.16 (mmol L-1)0.5, The readily exchangeable potassium (ΔK0) ranged from 0.04 to 2.199 with an average of 0.49 cmol kg-1, The potassium potential buffering capacity (PBCK) ranged from 13.21 to 75.37 with an average of 42.02 (mmol kg-1) / (mmol L-1)0.5. Highly significant linear correlations were found between PBCK and CEC (r = 0.6*), AR0 and KSO (r = 0.99**), AR0 and Kex (r = 0.85**). Among the studied soils, one soil (Chopolgh Lo soil) absorbed potassim on edge position of clay minerals and the others absorbed potassium on planar surface.

Keywords: Potassium, Quantity – intensity curves, Potential buffering capacity, Bahar area.

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