A non-destructive and real-time method of monitoring leaf nitrogen status in wheat

作者：Yao X; Feng W; Zhu Y; Tian Y C; Cao W X^*

来源：New Zealand Journal of Agricultural Research, 2007, 50(5): 935-942.

DOI：10.1080/00288230709510370

• hyperspectral remote sensing
• leaf nitrogen status
• monitoring model
• non-destructive
• winter wheat

Non-destructive assessment of leaf nitrogen status is helpful for precision nitrogen management in crop production. This study was conducted to quantify the relationships of leaf nitrogen concentration on a leaf dry weight basis (LNC) and leaf nitrogen accumulation on a soil area basis (LNA) to canopy hyperspectral reflectance in wheat. Both LNC and LNA increased with increasing nitrogen rates, along with marked changes in canopy hyperspectral reflectance. The sensitive spectral bands for LNC and LNA occurred mostly within visible light and the near-infrared regions. The hyperspectral parameters REPle, lambda o and mND705 were linearly related to LNC, and MSS-SARVI, FD742, PSSRb and SDr/SDb were linearly related to LNA. Testing of the REPle and mND705 gave the R-2 values of 0.752 and 0.695 between the measured and estimated LNC, relative errors (RE) of 14.4 and 16.5%, whereas for FD742 and SDr/SDb, the R 2 values were 0.872 and 0.828, with RE of 14.1 and 15.2% respectively.

• 出版日期2007-12
• 单位南京农业大学