| QIPoly {QI} | R Documentation |
Quantity-intensity (Q/I) relationship of soil K derived through a second order polynomial i.e., quadratic equation
Description
A quadratic equation of the form "y = ax2 + bx + c" can be fitted to Q/I data to find out different Q/I parameters
Usage
QIPoly(Solution2Soil = Solution2Soil, CKi = CKi, CKf = CKf, CCaMg = CCaMg)
Arguments
Solution2Soil |
Ratio of solution volume to soil mass (mL/g or L/kg) |
CKi |
Initial K concentration (mg/L) |
CKf |
Final or equilibrium K concentration (mg/L) |
CCaMg |
Final or equilibrium 'Ca+Mg' concentration (mol/L) |
Value
AReK - Equilibrium activity ratio (unitless) Kl - Total labile K (cmolc/kg) PBCK - Potential buffering capacity (cmolc/kg) deltaG0 - The standard free energy of exchange (cal/mol)
References
Wang, J.J., Harrell, D.L., Bell, P.F., 2004. Potassium buffering characteristics of three soils low in exchangeable potassium. Soil Science Society of America Journal 68, 654-661.
Wang, J.J., Scott, A.D., 2001. Effect of experimental relevance on potassium Q/I relationships and its implications for surface and subsurface soils. Communications in Soil Science and Plant Analysis 32, 2561-2575.
Examples
with(data = df, QIPoly(Solution2Soil = Solution_to_Soil_Ratio, CKi = Initial_K,
CKf = Final_K, CCaMg = Final_Ca_and_Mg))