ECconversion1 {soilassessment}

A function for harmonizing electrical conductivity of a soil solution to that of the saturated paste extract

Description

This function converts electrical conductivity measurements of a soil solution to that of soil paste extract. It considers the influence of texture, organic matter content, and clay content on electrical conductivity conversion. These factors and ratio of soil:water mix for the solution and conversion method must be indicated.

Usage

ECconversion1(ec,texture,method,extract,oc=NULL,clay=NULL)

Arguments

ec

measured electrical conductivity of the soil solution

texture

soil textural class according to USDA or its equivalent. Texture class is given in terms of class codes as given in classnames("texture")

method

method for converting electrical conductivity of the soil:water mix to that of the soil paste extract. The methods included are FAO, sonmez, and hogg. The default is FAO

extract

ratio of soil:water in extract solution for measuring electrical conductivity was measured. Example is 1:1, 1:2, etc. The default is 1:1

oc

organic matter content of the soil in percent

clay

clay content of the soil in percent

Details

This function considers the influence of texture and soil-water solution on conversion of electrical conductivities. The functions includes FAO, sonmez, and hogg conversion models. FAO model requires information on clay content and organic carbon content.

Value

equivalent electrical conductivity of saturated soil extract

Author(s)

Christian Thine Omuto

References

FAO. 2006. Soil description guidelines. FAO, Rome.

Sonmez S, Buyuktas D, Asri FO. 2008. Assessment of different soil to water ratios (1:1, 1:2.5, 1:5) in soil salinity studies. Geoderma, 144: 361-369

Hogg TTJ, Henry JL. 1984. Comparison of 1:1 and 1:2 suspensions and extracts with the saturation extracts in estimating salinity in Saskatchewan. Can. J. Soil Sci. 1984, 64, 699–704

See Also

ECconversion2, ECconversion3, ECconversion4

Examples

library(sp)
library(raster)
ECconversion1(7.31,"SiCl","FAO","1:2.5",0.91,22.5)
ec=suitabinput["ec"]
soc=nutrindicator["soc"]
clay=textureinput["clay"]
texture=suitabinput["texture"]
newmap=ec
newmap$ECe=ECconversion1(ec$ec,texture$texture,"FAO","1:2.5",soc$soc,clay$clay)
spplot(newmap["ECe"], main="Equivalent ECse")