saxton_1986_psi: Estimate Matric Water Potential using Saxton et al. (1986)

In ncss-tech/pedotransfR: Pedotransfer Functions used by USDA-NRCS / NCSS

Estimate Matric Water Potential using Saxton et al. (1986)

Description

Estimate Matric Water Potential using Saxton et al. (1986)

Usage

saxton_1986_psi(sand, clay, theta)

Arguments

sand	numeric; sand percentage
clay	numeric; clay percentage
theta	numeric; water content proportion

Value

numeric estimates of matric water potential (kPa) at specified water content ('theta') given 'sand' and 'clay' percentages

References

Saxton, K.E., W.J. Rawls, J.S. Romberger, R.I. Papendick. Estimating generalized soil-water characteristics from texture. Soil Sci. Soc. Am. J. 50: 1031-1036.

Examples

theta <- seq(0.00, 1, 0.01)
plot(log10(saxton_1986_psi(80, 10, theta)) ~ theta,
     xlab = "Water Content (\u03b8)", ylab="Log10 Matric Potential (\u03a8, kPa)", 
     type="l", lty=2, xlim=c(0,1))
lines(log10(saxton_1986_psi(35, 40, theta)) ~ theta, lty=3)
legend("topright", legend=c("80% sand / 10% clay", "35% sand / 40% clay"), lty=2:3)

ncss-tech/pedotransfR documentation built on Feb. 14, 2024, 10:06 p.m.