# compressive_properties5: Estimation of compressive properties by O'Sullivan et al.... In soilphysics: Soil Physical Analysis

## Description

It calculates the compressive parameteres N, lambda and kappa using the pedo-transfer function from O'Sullivan et al. (1999)

## Usage

 1 2 compressive_properties5(water.content, soil=c("SandyLoam","ClayLoam"))

## Arguments

 water.content a numeric vector containing the values of gravimetric water content, \% soil the the soil texture group 'SandyLoam' or 'ClayLoam'. See exemples.

## Details

See O'Sullivan et al. (1999).

## Value

 N the specific volume at p = 1 kPa, N CI the compression index, lambda k the recompression index, kappa

## Author(s)

Renato Paiva de Lima <renato_agro_@hotmail.com> Anderson Rodrigo da Silva <anderson.agro@hotmail.com>

## References

O'sullivan, M. F., Henshall, J. K., Dickson, J. W., 1999. A simplified method for estimating soil compaction. Soil and Tillage Research, 49: 325-335.

## Examples

 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 # EXAMPLE 1 water.content <- 15 compressive_properties5(water.content=water.content, soil="SandyLoam") compressive_properties5(water.content=water.content, soil="ClayLoam") # EXAMPLE 2 - SandyLoam water.content <- seq(from=5,to=20,len=20) out <- compressive_properties5(water.content=water.content, soil="SandyLoam") plot(x=water.content ,y=out\$N, ylab="N", xlab="Bulk density") # plot for N plot(x=water.content ,y=out\$lambda, ylab="lambda", xlab="Bulk density") # plot for lambda plot(x=water.content ,y=out\$kappa, ylab="kappa", xlab="Bulk density") # plot for kappa # EXAMPLE 3 - ClayLoam water.content <- seq(from=10,to=25,len=20) out <- compressive_properties5(water.content=water.content, soil="ClayLoam") plot(x=water.content ,y=out\$N, ylab="N", xlab="Bulk density") # plot for N plot(x=water.content ,y=out\$lambda, ylab="lambda", xlab="Bulk density") # plot for lambda plot(x=water.content ,y=out\$kappa, ylab="kappa", xlab="Bulk density") # plot for rkappa # End (not run)

soilphysics documentation built on Jan. 13, 2021, 7:06 p.m.