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.

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.

Corresponding BibTeX entries:

  @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},
  }
  @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},
  }