Table 2 The net photosynthesis rate (Pn) and SPAD value in the main-stem functional leaves of upland cotton at the early flowering and flowering and boll setting in 2019 and 2020
Treatment | Early flowering | Flowering and boll setting | |||||
|---|---|---|---|---|---|---|---|
SPAD | Pn /(μmol·m−2·s−1) | SPAD | Pn /(μmol·m−2·s−1) | ||||
| Â | 2019 | 2020 | Â | Â | Â | 2019 | 2020 |
MC1D1 | 48.38c | 47.31c | 27.74c | Â | 50.91b | 26.73d | 30.57c |
MC1D2 | 50.37b | 48.76b | 25.91e | Â | 52.45a | 25.23e | 27.40d |
MC1D3 | 52.10a | 49.57a | 26.70d | Â | 53.14a | 26.04de | 28.44d |
MC0D1 | 40.58f | 39.62f | 30.06a | Â | 50.10b | 31.98a | 34.15a |
MC0D2 | 41.20e | 40.57e | 28.22bc | Â | 47.57c | 29.89b | 30.85bc |
MC0D3 | 42.63d | 41.79d | 28.85b | Â | 47.31c | 28.45c | 32.21b |
| Â | 2019 | 2020 | Â | Â | Â | Â | Â |
MC1 | 50.28a | 48.54a | 26.78b | Â | 52.17a | 27.4b | Â |
MC0 | 41.49b | 40.66b | 29.04a | Â | 48.33b | 31.26a | Â |
| Â | Â | Â | 2019 | 2020 | Â | 2019 | 2020 |
D1 | 43.97a | Â | 27.35a | 30.46a | 50.50a | 29.35a | 32.36a |
D2 | 45.24a | Â | 26.64a | 27.49b | 50.01a | 27.56a | 29.13b |
D3 | 46.52a | Â | 26.27a | 29.28a | 50.23a | 27.25a | 30.33ab |