Estimation of winter wheat canopy nitrogen density at different growth stages based on Multi-LUT approach

Li, Z; Li, N; Li, Z; Wang, J; Liu, C

doi:10.1117/12.2278719

Estimation of winter wheat canopy nitrogen density at different growth stages based on Multi-LUT approach

Lookup NU author(s): Dr Zhenhai Li, Dr Na Li, Professor Zhenhong Li

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Abstract

© 2017 SPIE. Rapid real-time monitoring of wheat nitrogen (N) status is crucial for precision N management during wheat growth. In this study, Multi Lookup Table (Multi-LUT) approach based on the N-PROSAIL model parameters setting at different growth stages was constructed to estimating canopy N density (CND) in winter wheat. The results showed that the estimated CND was in line with with measured CND, with the determination coefficient (R2) and the corresponding root mean square error (RMSE) values of 0.80 and 1.16 g m-2, respectively. Time-consuming of one sample estimation was only 6 ms under the test machine with CPU configuration of Intel(R) Core(TM) i5-2430 @2.40GHz quad-core. These results confirmed the potential of using Multi-LUT approach for CND retrieval in winter wheat at different growth stages and under variables climatic conditions.