To cite 'soilphysics' in publications use:

  Da Silva, A.R.; De Lima, R.P. (2015) soilphysics: an R package to
  determine soil preconsolidation pressure. Computers and Geosciences,
  84: 54-60.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {soilphysics: an R package to determine soil preconsolidation pressure},
    author = {A. R. da Silva and R. P. {de Lima}},
    journal = {Computers and Geosciences},
    year = {2015},
    volume = {84},
    pages = {54-60},
  }

  de Lima, R.P.; da Silva, A.R.; da Silva, A.P.; Leao, T.P.;
  Mosaddeghi, M.R. (2016) soilphysics: an R package for calculating
  soil water availability to plants by different soil physical indices.
  Computers and Eletronics in Agriculture, 120: 63-71.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {soilphysics: an R package for calculating soil water availability to plants by different soil physical indices},
    author = {R. P. {de Lima} and A. R. da Silva and A. P. da Silva and T. P. Leao and M. R. Mosaddeghi},
    journal = {Computers and Eletronics in Agriculture},
    year = {2016},
    volume = {120},
    pages = {63-71},
  }

  Da Silva, A.R.; De Lima, R.P. (2017) Determination of maximum
  curvature point with the R package soilphysics International Journal
  of Current Research, 9: 45241-45245.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Determination of maximum curvature point with the R package soilphysics},
    author = {A. R. da Silva and R. P. {de Lima}},
    journal = {International Journal of Current Research},
    year = {2017},
    volume = {9},
    pages = {xx-yy},
  }

  De Lima, R.P.; Da Silva, A.R.; Da Silva, A.P. (2021) soilphysics: An
  R package for simulation of soil compaction induced by agricultural
  field traffic. Soil and Tillage Research, 206: 104824.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {soilphysics: An R package for simulation of soil compaction induced by agricultural field traffic},
    author = {R. P. {de Lima} and A. R. da Silva and A. P. da Silva},
    journal = {Soil and Tillage Research},
    year = {2021},
    volume = {206},
    pages = {104824},
  }