psd2classFAO_MOD: Generate modified FAO texture class

In melwey/euptf: Hydraulic pedotransfer functions for Europe

Generate modified FAO texture class

Description

Generate modified FAO soil texture class from sand, silt, clay content, and organic carbon content to distinguish organic soils.

Usage

psd2classFAO_MOD(sand = 0, silt = 0, clay = 0, OC = 0, option = FALSE, tol=1)

Arguments

sand	numeric vector of N observations of sand content in mass percent. Particles of diameter between 0.05 and 2 mm.
silt	numeric vector of N observations of silt content in mass percent. Particles of diameter between 0.002 and 0.05 mm.
clay	numeric vector of N observations of clay content in mass percent. Particles of diameter less than 0.002 mm.
OC	numeric vector of N observations of organic carbon content in mass percent. Determined by dry combustion after removal of carbonates or harmonised to that method.
option	logical. If FALSE (default), the output will be returned as a numeric vector. If TRUE, the output will be returned as a character vector.
tol	numeric setting the tolerance on the sum of sand, silt, clay. Default is 1: sum(sand,silt,clay) > 101 or < 99 will return NA.

Details

The texture classes are defined as: "coarse": 1, "medium": 2, "medium fine": 3, "fine": 4, "very fine": 5, "organic": 9. Organic soils are defined as soils having clay content >= 60 % clay and organic carbon >= 18 % , or having clay content < 60 % and organic carbon >= (12+clay*0.1).

Value

A numeric or character vector of length N with FAO texture class for each observation.

Author(s)

M. Weynants

References

CEC (1985). Soil Map of the European Communities, 1:1,000,000. CEC Luxembourg, 124pp. 7 maps.

IUSS Working Group WRB. 2006. World reference base for soil resources 2006. World Soil Resources Reports No. 103. FAO, Rome

See Also

psd2classUS,TT.points.in.classes

Examples

data(ptf.data)
ptf.data$TEXT_FAO_MOD <- psd2classFAO_MOD(ptf.data$USSAND,ptf.data$USSILT,ptf.data$USCLAY,ptf.data$OC,option=TRUE)

melwey/euptf documentation built on Sept. 17, 2022, 3:35 a.m.