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- W263272023 abstract "Potassium exchange-equilibrium parameters were outcome from quantity-intensity (Q/I) isotherms, i.e. K equilibrium activity ratio ( K O AR ), equilibrium potential buffering capacity for K ( K o PBC ), K labile (KLab), free energy of K replenishment ( K equ G ∆ − ); non-specific (Kx) and specific (∆Kequ) potassium, preferential factor ( ex ex K ) Mg Ca ( PF + ) and the Gapon selectivity coefficient (kG). It was found that soils did not generally differ in their exchangeable potassium (Kex) but did for % K saturation as an estimate of K lability. Potassium was differently controlled by soil properties of which organic carbon (Corg) exhibited weak relationships with most of Q/I parameters. Potassium activity ( K O AR ) was controlled more by silt (r = 0.97 P < 0.001), Fe (DCB and Ox, r = 0.81 and r = 0.71, P < 0.005, respectively) and Mn (DCB and Ox, r = 0.70 and r = 0.71, P < 0.005, respectively) than by the cation exchange capacity (CEC) and exchangeable cations (r = 0.50, P < 0.05, on average). Of mineral soil constituents, it was found that Fe and Mn oxides also significantly influenced the free energy of changes ( K equ G ∆ − with 0.75≤ r ≥ 0.63). This implies that studies on potassium dynamics of soils should additionally consider the level of Fe and Mn, as well. Most of the Gapon selectivity coefficients (kG) (i.e. 80%) fluctuated within the range 3.87-4.96 (dm·mol), suggesting that the relative affinity for K was quite similar, irrespective of the degree of K saturation. The latter one along with the pool of labile K (KLab) indicated that soils will sufficiently support plant cropping without any threat of K shortage, as stated by the K equ G ∆ − values." @default.
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- W263272023 title "Evaluation of potassium quantity-intensity parameters of selected Polish agricultural soils" @default.
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