Table 1 Effects of tillage methods and straw retention on grain yield and yield components for summer maize (2011–2014).
Year | Treatment | 1000-grain weight (g) | Grain number per ear (grain ear−1) | Number of productive ear (104 ear ha−1) | Yield (Mg ha−1) | Relative yield (%) |
|---|---|---|---|---|---|---|
2011 | CT0 | 312.6d | 521.8b | 6.7a | 7.0d | 1.0 |
CTS | 321.0a | 525.5a | 6.7a | 7.8b | 1.1 | |
NT0 | 311.3d | 513.3d | 6.7a | 7.0d | 1.0 | |
NTS | 319.9ab | 518.0c | 6.7a | 7.7b | 1.1 | |
SS0 | 317.3c | 519.9c | 6.7a | 7.2c | 1.0 | |
SSS | 320.5a | 525.5a | 6.7a | 7.9a | 1.1 | |
2012 | CT0 | 313.7d | 529.0b | 6.7a | 7.1c | 1.0 |
CTS | 319.0ab | 533.6a | 6.7a | 7.8ab | 1.1 | |
NT0 | 309.5e | 514.3d | 6.7a | 6.9d | 1.0 | |
NTS | 317.4b | 529.9b | 6.7a | 7.9a | 1.1 | |
SS0 | 316.0c | 529.0b | 6.7a | 7.1c | 1.0 | |
SSS | 319.8a | 528.1b | 6.7a | 7.9a | 1.1 | |
2013 | CT0 | 298.8g | 549.0a | 6.7a | 6.4e | 0.9 |
CTS | 327.4b | 514.1b | 6.7a | 7.4c | 1.1 | |
NT0 | 326.8b | 468.2d | 6.7a | 7.1d | 1.0 | |
NTS | 327.7b | 482.2d | 6.7a | 7.4c | 1.1 | |
SS0 | 311.0f | 513.1b | 6.7a | 7.7b | 1.1 | |
SSS | 330.0a | 499.3c | 6.7a | 8.0a | 1.1 | |
2014 | CT0 | 312.7d | 387.2f | 6.7a | 5.5e | 0.8 |
CTS | 359.7b | 481.1b | 6.7a | 7.0c | 1.0 | |
NT0 | 329.9c | 487.3a | 6.7a | 6.4d | 0.9 | |
NTS | 334.4c | 446.2c | 6.7a | 7.0c | 1.0 | |
SS0 | 310.8d | 442.9c | 6.7a | 7.3b | 1.1 | |
SSS | 349.1a | 384.4f | 6.7a | 7.4a | 1.1 |
