Table 3. Effects of N treatments on canopy fractional intercepted PAR (fIPAR) and leaf chlorophyll content index (CCI) and the vegetation indices NDVI, NDVIg, NDVIrgb, BR and GR (see Table 1 for details on the vegetation indices studied).
Values are average (standard error of the mean) of 3 plots. Values followed by the same letter are not significantly different at P < 0.05 according to SNK.
| N (Kg ha-1) |
fIPAR | CCI | NDVI | NDVIg | NDVIrgb | BR | GR |
|---|---|---|---|---|---|---|---|
| Anthesis | |||||||
| 0 | 0.58 (0.02) a | 26.4 (1.48) a | 0.36 (0.04) a | 0.24 (0.01) a | 0.49 (0.01) a | 1.26 (0.01) a | 1.63 (0.04) a |
| 60 | 0.61 (0.06) a | 34.3 (2.88) b | 0.42 (0.06) a | 0.26 (0.01) a | 0.51 (0.01) b | 1.40 (0.05) b | 1.72 (0.05) a |
| 120 | 0.62 (0.04) a | 30.9 (0.89) b | 0.42 (0.02) a | 0.26 (0.01) a | 0.52 (0.01) b | 1.43 (0.02) b | 1.71 (0.01) a |
| 180 | 0.67 (0.03) a | 32.8 (1.62) b | 0.48 (0.01) a | 0.27 (0.01) a | 0.52 (0.01) b | 1.43 (0.02) b | 1.74 (0.01) a |
| Initial grain filling | |||||||
| 0 | 0.61 (0.04) a | 25 (0.73) a | 0.31 (0.05) a | 0.22 (0.01) a | 0.48 (0.01) a | 1.27 (0.01) a | 1.57 (0.04) a |
| 60 | 0.66 (0.04) a | 28.6 (2.61) ab | 0.36 (0.02) a | 0.24 (0.01) ab | 0.50 (0.01) b | 1.35 (0.05) b | 1.64 (0.02) ab |
| 120 | 0.69 (0.02) a | 31.3 (0.78) b | 0.40 (0.02) a | 0.25 (0.01) ab | 0.51 (0.01) b | 1.39 (0.02) b | 1.66 (0.03) ab |
| 180 | 0.66 (0.01) a | 29.7 (3.62) ab | 0.45 (0.03) a | 0.26 (0) b | 0.52 (0.01) b | 1.42 (0.02) b | 1.72 (0.01) b |
| Final grain filling | |||||||
| 0 | 0.54 (0.09) a | 21.2 (0.21) a | 0.23 (0.02) a | 0.20 (0.01) a | 0.46 (0.01) a | 1.19 (0.03) a | 1.51 (0.02) a |
| 60 | 0.63 (0.08) a | 30.9 (2.47) b | 0.31 (0.01) b | 0.23 (0.01) b | 0.48 (0.01) b | 1.26 (0.02) ab | 1.61 (0.01) b |
| 120 | 0.63 (0.05) a | 30.2 (1.00) b | 0.31 (0.03) b | 0.23 (0.01) b | 0.48 (0.01) b | 1.29 (0.04) b | 1.59 (0.04) b |
| 180 | 0.68 (0.04) a | 34.2 (3.05) b | 0.35 (0.01) b | 0.24 (0.01) b | 0.5 (0.01) b | 1.32 (0.02) b | 1.64 (0.01) b |