soilphysics: compressive_properties4 – R documentation

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compressive_properties4

Estimation of compressive properties by de Lima et al. (2020)

Description

It calculates the compressive parameters N, lambda and kappa using the pedo-transfer function from de Lima et al. (2020)

Usage

compressive_properties4(matric.suction, soil=c("PloughLayer","PloughPan"))

Arguments

`matric.suction`	a numeric vector containing the values of matric suction, hPa.
`soil`	the soil compaction state 'PloughLayer' or 'PloughPan'. See the examples.

Details

Pedo-transfer function developed for a sandy loam soil texture. 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., Rolim, M. M., da C. Dantas, D., da Silva, A. R., Mendonca, E. A., 2020. Compressive properties and least limiting water range of plough layer and plough pan in sugarcane fields. Soil Use and Management, 00: 1-12.

Examples

# EXAMPLE 1

compressive_properties4(matric.suction=100, soil="PloughLayer")
compressive_properties4(matric.suction=100, soil="PloughPan")



# EXAMPLE 2 for "PloughLayer"

matric.suction <- seq(from=10,to=10000,len=100)
out <- compressive_properties4(matric.suction=matric.suction, soil="PloughLayer")
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 "PloughPan"

matric.suction <- seq(from=10,to=10000,len=100)
out <- compressive_properties4(matric.suction=matric.suction, 
                               soil="PloughPan")
# plot for N
plot(x=matric.suction,y=out$N, 
     ylab="N", xlab="Matric suction (hPa)", log="x") 
# plot for lambda
plot(x=matric.suction,y=out$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