Relationship Between The Quantity And Intensity Of Potassium In Some Maize Soils Of Central Kashmir (India)
DOI:
https://doi.org/10.48165/Abstract
Plant K uptake depends on its intensity, capacity and removal rate of soils which can be modeled using K exchange-equilibrium obtained from quantity-intensity (Q/I) isotherms i.e. activity ratio at equilibrium (AReK), labile K (KL), potential buffering capacity (PBCK) and free energy change (-∆G). These relations were studied in five major maize growing soils of district Ganderbal (Kashmir, India). AReKranged from 0.26 to 1.21 x 10-3 (Mol L-1)0.5, KL from 0.26 to 0.67 cmolc kg-1, PBCKfrom 23.2 to 37.6 cmolc kg-1/(Mol L-1)0.5 and -∆G from 3.98 to 4.81 K cal mol-1oK-1. AReK was found significantly correlated with clay (r = 840**) and K0 (r = 988*). Magnitude of labile K (KL), K held on non-specific sites (K0) and specific sites (KX) were higher in Sumbal silty clay. The negative values of ∆G indicated that K- (Ca + Mg) exchange in all the soils was spontaneous.
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