r | R Documentation |
The equivalent pore radius as a function of soil water tension.
r(h, surface.tension.water=0.072, water.density=1000, water.pore.contact.angle=0)
h |
The water tension (hPa). |
surface.tension.water |
Surface tension of water (N/m). |
water.density |
Density of water (kg/m^3). |
water.pore.contact.angle |
Water pore contact angle (degrees). |
The equivalent pore radius, in micrometer..
Renato Paiva de Lima <renato_agro_@hotmail.com>
Ghiberto, P. J., Imhoff, S., Libardi, P. L., Silva, A. P. D., Tormena, C. A., Pilatti, M. A. (2015). Soil physical quality of Mollisols quantified by a global index. Scientia Agricola, 72(2):167-174.
x <- seq(log10(1), log10(15000), len=50) h <- 10^x y <- r(h=h) plot(x=h, y=y, log="yx", xlab="h (hPa)", yaxt='n', ylab="", ylim=c(0.1, 1500)) ax <- c(0.1, 1, 10, 100, 1000, 1500) axis(2,at=ax, labels=ax) mtext("Pore radius"~ (mu*m), 2, line=2.5) # End (not run)
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