Table 3. Photosynthetic parameters of relay-intercropped maize and soybean as affected by different planting pattern from 2016 to 2017.
| Years | Stages | Treatments | Photosynthetic Rate (μmol CO2 m-2 s-1) |
Stomatal Conductance (mol H2O m-2 s-1) |
Transpiration Rate (mmol H2O m-2 s-1) |
Intercellular CO2 Concentration (μmol CO2 m-2 s-1) |
||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Maize | Soybean | Maize | Soybean | Maize | Soybean | Maize | Soybean | |||||||
| WR | NR | WR | NR | WR | NR | WR | NR | |||||||
| 2016 | TS—V1 | 2M2S | 28.8a | 28.1b | 9.7b | 0.32a | 0.29b | 0.14a | 2.93a | 2.89a | 3.3b | 211.9b | 216.5b | 252.2b |
| 1M1S | 28.5a | 28.7a | 5.5c | 0.3a | 0.31a | 0.08b | 2.91a | 2.91a | 2.5c | 222.3b | 229.2a | 271.4a | ||
| M | 27.9b | 28.2b | - | 0.26b | 0.27b | - | 2.87b | 2.83b | - | 248.5a | 236.4 | - | ||
| S | - | - | 13.4a | - | - | 0.16a | - | - | 5.3a | - | - | 205.2c | ||
| GFS—V5 | 2M2S | 26.8a | 21.3c | 11.6b | 0.21a | 0.11b | 0.86b | 3.51a | 1.98c | 3.9b | 110.2b | 176.3a | 293.6c | |
| 1M1S | 24.2b | 24.5a | 5.6c | 0.17b | 0.15a | 0.59c | 3.26a | 3.19a | 3.5c | 145.6a | 142.8b | 312.5a | ||
| M | 23.6c | 23.5b | - | 0.14b | 0.14a | - | 2.69b | 2.64b | - | 153.2a | 156.8a | - | ||
| S | - | - | 14.8a | - | - | 1.03a | - | - | 4.3a | - | - | 305.6b | ||
| MS—R1 | 2M2S | 19.3a | 22.8a | 12.9b | 0.19a | 0.20a | 0.63b | 2.88a | 2.92a | 3.8a | 121.6c | 119.8b | 306.8a | |
| 1M1S | 18.6a | 18.5b | 8.8c | 0.17a | 0.15b | 0.43c | 2.76b | 2.68b | 3.4b | 133.5b | 135.2b | 290.1b | ||
| M | 16.8b | 17.1c | - | 0.13b | 0.13b | - | 2.63c | 2.58b | - | 221.4a | 226.5a | - | ||
| S | - | - | 14.5a | - | - | 0.76a | - | - | 3.9a | - | - | 309.7a | ||
| 2017 | TS—V1 | 2M2S | 26.6a | 22.3c | 9.3b | 0.21a | 0.19b | 0.24b | 2.69b | 2.66b | 4.1b | 278.6a | 289.4a | 313.6b |
| 1M1S | 24.1b | 24.4a | 6.1c | 0.21a | 0.22b | 0.11c | 2.72a | 2.73a | 3.5c | 266.4b | 253.1b | 328.1a | ||
| M | 23.8c | 23.8b | - | 0.23a | 0.24a | - | 2.69b | 2.68b | - | 276.4a | 273.5a | - | ||
| S | - | - | 13.1a | - | - | 0.38a | - | - | 4.6a | - | - | 296.9c | ||
| GFS—V5 | 2M2S | 24.3a | 20.8b | 12.1b | 0.18a | 0.09b | 0.93a | 3.22a | 1.67b | 4.5b | 148.5b | 183.4a | 318.9b | |
| 1M1S | 22.6b | 22.4a | 4.9c | 0.13b | 0.13a | 0.62b | 2.75b | 2.73a | 3.8c | 162.8a | 163.7b | 333.2a | ||
| M | 22.1b | 22.1a | - | 0.13b | 0.12a | - | 2.69b | 2.68a | - | 163.1a | 168.9b | - | ||
| S | - | - | 16.3a | - | - | 1.03a | - | - | 5.2a | - | - | 320.5b | ||
| MS—R1 | 2M2S | 17.8a | 21.3a | 12.3b | 0.15a | 0.16a | 0.86a | 2.84a | 2.84a | 3.5b | 158.2b | 143.8b | 286.9a | |
| 1M1S | 17.1a | 17.8b | 10.6c | 0.14a | 0.13b | 0.25b | 2.65b | 2.66b | 3.2c | 162.8b | 163.7b | 273.3b | ||
| M | 14.5b | 14.4c | - | 0.11b | 0.11b | - | 2.45c | 2.38c | - | 256.8a | 249.7a | - | ||
| S | - | - | 15.7a | - | - | 0.93a | - | - | 3.9a | - | - | 292.5a | ||
TS, GFS and MS refers to tasseling, grain filling and maturity stage of maize corresponding to second trifoliate (V2), fifth trifoliate (V5) and flower initiation (R1) stage of soybean, respectively. The 2M2S (40 cm: 60 cm: 40 cm: 60 cm) and 1M1S (50 cm: 50 cm). The SM and SS refer to sole cropping system of maize and soybean, respectively. The WR and NR wide rows (WR; right side) and narrow rows (NR; left side), respectively. Means are averaged over three replicates. Different lowercase letters in the same line are significantly different at 0.05 probability level.