geoR (version 1.6-35)

wrc: Points of a water retention curve data set

Description

Soil density and measures of the water retention curve obtained at different pressures on a regular grid with 10x25 points spaced by 5 meters.

Usage

data(wrc)

encoding

latin1

source

MORAES, S.O. (1991) Heterogeneidade hidr�ulica de uma terra roxa estruturada. PhD Thesis. ESALQ/USP.

Details

Uniformity trial with 250 undisturbed soil samples collected at 25cm soil depth of spacing of 5 meters, resulting on a regular grid of $25 \times 10$ sampling points.

For each sampling point there are measurents of the soil density and water content obtained at eight pressures: 5, 10, 60, 100, 306, 816, 3060 and 15300 meters of column of water (mca), corresponding to $5 \times 10^2$, $1 \times 10^3$, $6 \times 10^3$, $1 \times 10^4$, $3 \times 10^4$, $8 \times 10^4$, $3 \times 10^5$, $1.5 \times10^6$ Pa.

The experiment aimed to use the water contents of the samples to estimate the water retention curve at the 250 data points.

See also the data-set soil250 with soil chemistry properties measured at the same points.

References

MORAES, S. O. ; LIBARDI, P. L. ; REICHARDT, K. (1993) Problemas metodol�gicos na obten��o da curva de reten��o de �gua pelo solo. Scientia Agricola, Piracicaba, v. 50, n. 3, p. 383-392. MORAES, S. O. ; LIBARDI, P. L. ; REICHARDT, K. ; BACCHI, O. O. S. (1993) Heterogeneidade dos pontos experimentais de curvas de reten��o da �gua do solo.. Scientia Agricola, Piracicaba, v. 50, n. 3, p. 393-402.

MORAES, S. O. ; LIBARDI, P. L. (1993) Variabilidade da �gua dispon�vel em uma terra roxa estruturada latoss�lica. Scientia Agricola, Piracicaba, v. 50, n. 3, p. 393-402, 1993.

Examples

pr100 <- as.geodata(wrc, data.col=7)
summary(pr100)
plot(pr100)