Assessing in-season crop nitrogen status based on UAV multispectral imaging and AI-driven model optimization - Yeying Zhou; Syed Tahir Ata-Ul-Karim; Jingru Yin; Marco Canicatti'; Lili Tóth; Sheng Wang; Yuntao Ma; Caicong Wu; Mathias Neumann Andersen; Davide Cammarano (Computers and Electronics in Agriculture, 2026)