TABLE 2.
Effects of different N application rates on net photosynthetic rate, stomatal conductance, intercellular CO2 concentration and transpiration rate at flowering stage of winter wheat in 2018 and 2019.
| Year | Treatments | Index | |||
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| Net photosynthetic rate | Stomatal conductance | Intercellular CO2 concentration | Transpiration rate | ||
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| (μmol m–2 s–1) | (mmol m–2⋅s–1) | (μmol mol–1) | (mmol m–2 s–1) | ||
| 2018 | N0 | 12.35e | 0.09d | 180.98a | 2.70e |
| N75 | 13.91d | 0.09d | 163.38b | 2.84d | |
| N150 | 18.98c | 0.16c | 140.62e | 4.36c | |
| N225 | 26.32a | 0.26a | 131.96d | 6.91a | |
| N300 | 22.62b | 0.22b | 152.31c | 6.18b | |
| 2019 | N0 | 8.81c | 0.32b | 362.10a | 1.61b |
| N75 | 10.16b | 0.33b | 348.82b | 1.70b | |
| N150 | 10.89a | 0.37ab | 338.60c | 1.78ab | |
| N225 | 11.05a | 0.40a | 332.85c | 1.89a | |
| N300 | 10.62ab | 0.34b | 350.94b | 1.69b | |
N0: unfertilized control; N75: N application at 75 kg N⋅ha–1; N150: N application at 150 kg N⋅ha–1; N225: N application at 225 kg N⋅ha–1; N300: traditional N application rate of 300 kg N⋅ha–1. Different small letters show significant differences at p < 0.05.