| wrc {geoR} | R Documentation |
Soil density and measures of the water retention curve obtained at different pressures on a regular grid with 10x25 points spaced by 5 meters.
data(wrc)
A data frame with 250 observations on the following 11 variables.
CoordXCoordYDensidadePr5Pr10Pr60Pr100Pr306Pr816Pr3060Pr15300Uniformity trial with 250 undisturbed soil samples collected at 25cm soil depth of spacing of 5 meters, resulting on a regular grid of 25 x 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 x 10^2, 1 x 10^3, 6 x 10^3, 1 x 10^4, 3 x 10^, 8 x 10^4, 3 x 10^5, 1.5 x 10^6 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.
MORAES, S.O. (1991) Heterogeneidade hidráulica de uma terra roxa estruturada. PhD Thesis. ESALQ/USP.
MORAES, S. O. ; LIBARDI, P. L. ; REICHARDT, K. (1993) Problemas metodológicos na obtenção da curva de retenção de água 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 retenção da água do solo.. Scientia Agricola, Piracicaba, v. 50, n. 3, p. 393-402.
MORAES, S. O. ; LIBARDI, P. L. (1993) Variabilidade da água disponível em uma terra roxa estruturada latossólica. Scientia Agricola, Piracicaba, v. 50, n. 3, p. 393-402, 1993.
pr100 <- as.geodata(wrc, data.col=7) summary(pr100) plot(pr100)