@article{camacho-tamayo_barbosa_pérez_leiva_rodríguez_2009,  title={Operational characteristics of four metering systems for agricultural fertilizers and amendments},  volume={29},  ISSN={0100-6916},  url={https://doi.org/10.1590/S0100-69162009000400010},  DOI={10.1590/S0100-69162009000400010},  number={4},  journal={Engenharia Agrícola},  publisher={Associação Brasileira de Engenharia Agrícola},  author={Camacho-Tamayo, Jesus H. and Barbosa, Angela M. and Pérez, Nancy M. and Leiva, Fabio R. and Rodríguez, Gonzalo A.},  year={2009},  pages={605–613} }