Estimation of Winter Wheat Canopy Nitrogen Density at Different Growth Stages Based on Multi-LUT Approach

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 measured CND, with the determination coefficient (R-2) 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 0.6 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.