@article{mayrink_queiroz_coelho_valente_2022,  title={SOIL PHOSPHORUS TEST USING A LOW-COST SPECTROPHOTOMETER AND MACHINE LEARNING},  volume={42},  ISSN={0100-6916},  url={https://doi.org/10.1590/1809-4430-Eng.Agric.v42n6e20210228/2022},  DOI={10.1590/1809-4430-Eng.Agric.v42n6e20210228/2022},  number={6},  journal={Engenharia Agrícola},  publisher={Associação Brasileira de Engenharia Agrícola},  author={Mayrink, Grégory O. and Queiroz, Daniel M. de and Coelho, Andre L. de F. and Valente, Domingos S. M.},  year={2022},  pages={e20210228} }