Reis, M., Reis, P., Martinez, M. E., Lopes, Y., Guimarães, G., & de Oliveira, A. M. (2021). Study on the Innovation Process in Precision Agriculture using patent mapping using NPK sensors in the production of fertilizers. Journal of Mechatronics Engineering, 4(1), 2–11. https://doi.org/10.21439/jme.v4i1.87