Water Regime | Photosynthetic WUE (µmol/m mol) | Net Photosynthesis (µmol m2 s−1) | Stomatal Conductance (mmol m2 s−1) | Transpiration (mmol m2 s−1) | Internal Carbon (ppm) | Vapour Pressure Deficit (bars) | |
Cultivars (n = 16) |
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Moonlight | 6.7 b | 10.8b | 116.3b | 1.61b | 223.2a | 16.1 | |
Agria | 6.9 b | 12.4b | 142.9a | 1.81a | 206.7a | 14.1 | |
Moe Moe | 8.6 a | 14.4a | 122.9b | 1.67b | 160.4b | 15.8 | |
Tutaekuri | 9.4 a | 14.2a | 115.6b | 1.51b | 188.6b | 17.5 | |
Significant | p < 0.001 | p < 0.0001 | p < 0.05 | p < 0.05 | p < 0.01 | Ns | |
Irrigation (n = 32) |
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60% ET | 8.5 | 10.8b | 123.2 | 1.52 | 170.4 | 17.1a | |
100% ET | 9.2 | 12.6a | 134.1 | 1.61 | 153.1 | 14.8b | |
Significant | Ns | p < 0.0001 | Ns | Ns | Ns | p < 0.05 | |
Nitrogen (32) |
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50 kg N ha−1 | 9.2 | 10.9 | 118.4b | 1.50 | 153.0 | 15.1 | |
200 kg N ha−1 | 8.5 | 12.4 | 138.9a | 1.63 | 170.5 | 16.7 | |
Significant | Ns | p < 0.0001 | p < 0.01 | Ns | Ns | Ns | |
Days after emergence (n = 64) |
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20 | 9.6a | 17.7a | 130.1a | 1.84b | - | 15.3 | |
50 | 6.9b | 12.8a | 144.0a | 2.08a | - | 18.1 | |
65 | 9.3a | 12.3a | 145.1a | 1.52b | 168.8 | 15.1 | |
85 | 9.8a | 9.1b | 78.8b | 1.15c | 140.6 | 15.1 | |
Significant | p < 0.01 | p < 0.0001 | p < 0.0001 | p < 0.0001 | NS | Ns | |
Interaction |
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Var.*DAE | Ns | p < 0.0001 | Ns | Ns | Ns | Ns | |
Var.*N*IRR | Ns | p < 0.05 | Ns | Ns | NS | Ns | |