fitsoilwater3: Interactive Estimation of the Dexter's (2008) Model...

Description Usage Arguments Value Author(s) References See Also Examples

Description

An interactive graphical adjustment of the soil water retention curve through the Dexter's (2008) formula. The nonlinear least-squares estimates can be achieved taking the graphical initial values.

Usage

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fitsoilwater3(theta, x, xlab = NULL, ylab = NULL, ...)

Arguments

theta

a numeric vector containing the values of soil water content.

x

a numeric vector containing the values of applied air pressure.

xlab

a label for the x axis; if is NULL, the label "pF" is used.

ylab

a label for the y axis; if is NULL, the label "Soil water content" is used.

...

further graphical arguments; see par.

Value

A plot of theta versus x and the curve of the current fitted model according to the adjusted parameters in an external interactive panel. Pressing the button "NLS estimates" a nls summary of the fitted model is printed on console whether convergence is achieved, otherwise a warning box of "No convergence" is shown.

Author(s)

Anderson Rodrigo da Silva <anderson.agro@hotmail.com>

References

Dexter et al. (2008). A user-friendly water retention function that takes account of the textural and structural pore spaces in soil. Geoderma, 143:243–253.

See Also

soilwater3, nls, fitsoilwater2

Examples

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# data extracted from Liu et al. (2011)
h <- c(0.001, 50.65, 293.77, 790.14, 992.74, 5065, 10130, 15195)
w <- c(0.5650, 0.4013, 0.2502, 0.2324, 0.2307, 0.1926, 0.1812, 0.1730)
fitsoilwater3(w, h)

# End (not run)

soilphysics documentation built on Jan. 13, 2021, 7:06 p.m.