FIGUEROA-VIRAMONTES, Uriel. SPAD-502 calibration to evaluate nitrogen requirements in forage corn. REVISTA TERRA LATINOAMERICANA, [S. l.], v. 27, n. 4, p. 303–309, 2009. Disponível em: https://terralatinoamericana.org.mx/index.php/terra/article/view/1267. Acesso em: 15 jul. 2024.