Combining the critical nitrogen concentration and machine learning algorithms to estimate nitrogen deficiency in rice from UAV hyperspectral data
YU Feng-hua, BAI Ju-chi, JIN Zhong-yu, GUO Zhong-hui, YANG Jia-xin, CHEN Chun-ling
Journal of Integrative Agriculture . 2023, (4): 1216 -1229 .  DOI: 10.1016/j.jia.2022.12.007