AUTHOR=Yang Chenbo , Feng Meichen , Bai Juan , Sun Hui , Bi Rutian , Song Lifang , Wang Chao , Zhao Yu , Yang Wude , Xiao Lujie , Zhang Meijun , Song Xiaoyan TITLE=Hyperspectral estimation of chlorophyll density in winter wheat using fractional-order derivative combined with machine learning JOURNAL=Frontiers in Plant Science VOLUME=15 YEAR=2025 URL=https://www.frontiersin.org/journals/plant-science/articles/10.3389/fpls.2024.1492059 DOI=10.3389/fpls.2024.1492059 ISSN=1664-462X