Rosa, Hugo José Andrade, Lucas Rios do Amaral, José Paulo Molin, and Heitor Cantarella. 2015. “Sugarcane Response to Nitrogen Rates, Measured by a Canopy Reflectance Sensor”. Pesquisa Agropecuaria Brasileira 50 (9):840-48. https://doi.org/10.1590/S1678-3921.pab2015.v50.21093.