To cite soiltestcorr in publications use:

  Correndo, A.A., et. al., 2023. The soiltestcorr R package: An
  accessible framework for reproducible correlation analysis of crop
  yield and soil test data. SoftwareX 21, 101275,
  https://doi.org/10.1016/j.softx.2022.101275

A BibTeX entry for LaTeX users is

  @Article{,
    title = {The soiltestcorr R package: An accessible framework for reproducible correlation analysis of crop yield and soil test data},
    author = {Adrian A. Correndo and Austin Pearce and Carl H. Bolster and John T. Spargo and Deanna Osmond and Ignacio A. Ciampitti},
    journal = {SoftwareX},
    year = {2023},
    volume = {21},
    pages = {101275},
    doi = {10.1016/j.softx.2022.101275},
    url = {https://doi.org/10.1016/j.softx.2022.101275},
  }