1. Hyperspectral Estimation of Nitrogen Content in Winter Wheat Leaves Based on Unmanned Aerial Vehicles
- Author
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Liu Mingxing, Xu Shouzhi, Yang Guijun, Li Changchun, Li Zhenhai, Feng Haikuan, Yang Fuqin, and Pei Haojie
- Subjects
0106 biological sciences ,Winter wheat ,food and beverages ,Hyperspectral imaging ,chemistry.chemical_element ,Monitoring system ,04 agricultural and veterinary sciences ,Grain filling ,01 natural sciences ,Nitrogen ,Model validation ,Agronomy ,chemistry ,Partial least squares regression ,040103 agronomy & agriculture ,0401 agriculture, forestry, and fisheries ,Environmental science ,Stage (hydrology) ,010606 plant biology & botany - Abstract
Leaf nitrogen content is an important index of crop growth and plays an important role in crop growth and development. In this paper, the hyperspectral data of winter wheat and the leaf nitrogen content is used to study winter wheat on flagging stage, flowering stage and grain filling stage. The estimation model of nitrogen content in winter wheat leaves at different growth stages is constructed by using partial least squares method and verified by using a cross-validation method. The results showed that R2 and the RMSE of the three growth stages were 0.53, 0.68, 0.64 and 0.331%, 0.246% and 0.406% respectively, and R2 and RMSE of model validation were 0.44, 0.71, 0.64 and 0.369%, 0.235% and 0.410%. Both the prediction model and the verification model had high reliability. Therefore, it is feasible for UAV to carry hyperspectral monitoring system for retrieving nitrogen content of winter wheat leaves.
- Published
- 2019