@article{medeiros_figueiredo_mafra_2010, title={Portable penetrometer for agricultural soil: sensitivity test to identify critical compaction depth}, volume={34}, ISSN={0100-0683}, url={https://doi.org/10.1590/S0100-06832010000600006}, DOI={10.1590/S0100-06832010000600006}, number={6}, journal={Revista Brasileira de Ciência do Solo}, publisher={Sociedade Brasileira de Ciência do Solo}, author={Medeiros, João Carlos and Figueiredo, Getulio Coutinho and Mafra, Álvaro Luiz}, year={2010}, month={Nov}, pages={1823–1829} }