Gardner (1958) Fit 
The Gardner dialog contains the equation parameters necessary to mathematically represent the SWCC curve with the equation proposed by Gardner (1958). A description of the theory can found in the SVSOILS Theory Manual.
ag: The ag field refers to a fitting parameter in the Gardner (1958) equation. The ag parameter is indirectly related to the airentry value of the soil.
ng: The ng field refers to another fitting parameter in the Gardner (1958) equation. The ng parameter is related to the steepness of the SWCC.
Fit: The Fit indicates whether the experimental data has been fit with the Gardner (1958) equation.
Error: The Error field shows the difference between the fitted data and the laboratory values in terms of R2.
Residual WC: The Residual WC field refers to the calculated residual gravimetric water content from the Gardner (1958) equation.
AEV: The AEV field shows the airentry value calculated from the Gardner (1958) fit of the soilwater characteristic curve (kPa).
Max. Slope: The Max. Slope refers to the maximum slope (on a semilog plot) of the Gardner (1958) fit of the soilwater characteristic curve (unitless).
Click the graph button at the bottom of the dialog to display a graph.
