Using machine learning and RGB images to assess nitrogen and potassium status in sorghum (Sorghum bicolor L.) under field conditions - Martins, Guilherme Augusto; Baesso, Murilo Mesquita; Devechio, Fernanda de Fátima da Silva; Tech, Adriano Rogério Bruno; Regazzo, Jamile Raquel; Ricci, Carlos Eduardo Nunes; Leão, Murilo de Lima (AgriEngineering, 2025)