Table 1 Descriptive statistics of rice aboveground biomass (AGB), plant nitrogen concentration (PNC), plant nitrogen uptake (PNU) and nitrogen nutrition index (NNI) for calibration and validation datasets across sites, cultivars, stages and years.
Dataset | AGB (t ha−1) | PNC (g kg−1) | PNU (kg ha−1) | NNI | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Mean | SD | CV | Mean | SD | CV | Mean | SD | CV | Mean | SD | CV | |
Calibration dataset | ||||||||||||
PI&SE (n = 286) | 2.66 | 1.07 | 40.4 | 21.0 | 4.40 | 21.0 | 53.3 | 20.5 | 38.4 | 1.02 | 0.20 | 19.5 |
HD (n = 198) | 8.77 | 1.57 | 17.9 | 14.5 | 2.29 | 15.8 | 128.3 | 33.8 | 26.3 | 1.09 | 0.20 | 18.5 |
Across all stages (n = 484) | 5.16 | 3.28 | 63.5 | 18.3 | 4.87 | 26.6 | 84.0 | 45.6 | 54.2 | 1.05 | 0.20 | 19.4 |
Validation dataset | ||||||||||||
PI&SE (n = 142) | 2.68 | 1.11 | 41.5 | 20.9 | 4.24 | 20.3 | 53.8 | 21.1 | 39.3 | 1.02 | 0.20 | 19.7 |
HD (n = 98) | 8.96 | 1.61 | 18.0 | 14.2 | 2.30 | 16.2 | 128.6 | 34.5 | 26.9 | 1.08 | 0.20 | 18.9 |
Across all stages (n = 240) | 5.24 | 3.37 | 64.3 | 18.2 | 4.84 | 26.7 | 84.3 | 45.9 | 54.4 | 1.04 | 0.20 | 19.5 |
