Table 3. Effects of plastic film mulching and irrigation on grain-filling characteristics of maize.
| Rainfall | Grain position | Treatment | Wmax | Gmax | Gmen | D |
|---|---|---|---|---|---|---|
| mg | mg per grain d-1 | mg per grain d-1 | d | |||
| 220 | Upper | PM | 211.8b | 6.77b | 5.18b | 37.1b |
| TN | 234.7a | 8.45a | 5.61a | 41.3a | ||
| Middle | PM | 223.1b | 9.38a | 6.43a | 34.7b | |
| TN | 251.9a | 9.29a | 6.05b | 39.2a | ||
| Basal | PM | 239.9b | 10.59a | 7.08a | 31.6b | |
| TN | 263.4a | 10.62a | 6.41b | 38.1a | ||
| 270 | Upper | PM | 262.1a | 10.29a | 6.23a | 40.3a |
| TN | 246.7b | 9.25b | 5.72b | 42.1a | ||
| Middle | PM | 282.8a | 11.49a | 6.88a | 38.1a | |
| TN | 260.9b | 10.27b | 6.14b | 39.4a | ||
| Basal | PM | 287.9a | 11.77a | 7.22a | 38.4a | |
| TN | 274.4b | 11.13b | 6.47b | 39.1a | ||
| 320 | Upper | PM | 271.1a | 11.59a | 6.50a | 41.4a |
| TN | 257.3b | 11.01b | 6.05b | 42.5a | ||
| Middle | PM | 289.1a | 12.28a | 7.16a | 39.3a | |
| TN | 281.5a | 12.52a | 7.18a | 39.7a | ||
| Basal | PM | 290.9a | 12.50a | 7.29a | 38.6a | |
| TN | 288.5a | 12.59a | 7.21a | 39.3a |
Values within a column and for the same grain type followed by different letters are significantly different at P = 0.05. PM: plastic film mulching management; TN: traditional non mulching management. Wmax: the maximum grain weight; Gmax: maximum grain-filling rates; Gmean: mean grain-filling rates; D: activity grain-filling period.