soilphysics: compressive_properties3 – R documentation

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compressive_properties3

Estimation of compressive properties by de Lima et al. (2018)

Description

It calculates the compressive parameters N, lambda and kappa using the pedo-transfer function from de Lima et al. (2018)

Usage

compressive_properties3(bulk.density, matric.suction, soil=c("SandyLoam","SandyClayLoam"))

Arguments

`bulk.density`	a numeric vector containing the values of bulk density, Mg m^{-3}
`matric.suction`	a numeric vector containing the values of matric suction, hPa
`soil`	the soil texture group 'SandyLoam' or 'SandyClayLoam'. See exemples

Details

Pedo-transfer function deveploed under no-till condition. See de Lima et al. (2018)

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

de Lima, R. P., da Silva, A. P., Giarola, N. F., da Silva, A. R., Rolim, M. M., Keller, T., 2018. Impact of initial bulk density and matric suction on compressive properties of two Oxisols under no-till. Soil and Tillage Research, 175: 168-177.

Examples

# EXAMPLE 1

compressive_properties3(bulk.density=1.5, matric.suction=100, soil="SandyLoam")
compressive_properties3(bulk.density=1.5, matric.suction=100, soil="SandyClayLoam")

# EXAMPLE 2 for SandyLoam soil

matric.suction <- seq(from=30,to=1000,len=100)
out <- compressive_properties3(bulk.density=1.5, 
	matric.suction=matric.suction, soil="SandyLoam")
plot(x=matric.suction,y=out$N, ylab="N", 
	xlab="Matric suction (hPa)", log="x") # plot for N
# plot for lambda
plot(x=matric.suction,y=out$lambda, ylab="lambda", 
	xlab="Matric suction (hPa)", log="x") 
# plot for kappa
plot(x=matric.suction,y=out$k, ylab="kappa", 
	xlab="Matric suction (hPa)", log="x") 


# EXAMPLE 3 for SandyClayLoam soil

matric.suction <- seq(from=30,to=1000,len=100)
out <- compressive_properties3(bulk.density=1.5, 
				matric.suction=matric.suction, 
				soil="SandyClayLoam")
plot(x=matric.suction,y=out$N, ylab="N", 
     xlab="Matric suction (hPa)", log="x") # plot for N
# plot for lambda
plot(x=matric.suction,y=out$lambda, 
     ylab="lambda", xlab="Matric suction (hPa)", log="x")
# plot for kappa
plot(x=matric.suction,y=out$k, 
     ylab="kappa", xlab="Matric suction (hPa)", log="x")

# End (not run)

soilphysics

Soil Physical Analysis

v4.0

GPL (>= 2)

Authors

Anderson Rodrigo da Silva [aut, cre] (<https://orcid.org/0000-0003-2518-542X>), Renato Paiva de Lima [aut] (<https://orcid.org/0000-0003-0524-439X>)

Initial release

2020-12-06