Table 1. Effects of N and corn cultivars on corn growth.
| Parameters | Stages or periods | N | C | C × N |
|---|---|---|---|---|
| Leaf dry weight (g m−2) | A | ** | * | n.s. |
| B | ** | ** | n.s. | |
| C | * | * | n.s. | |
| The maximum quantum yield of PSII (Fv/Fm) | A | * | * | * |
| B | * | * | * | |
| C | * | * | n.s. | |
| Photosynthetic CO2 assimilation (Ph, μmol m−2 s−1) | A | ** | * | * |
| B | ** | ** | ** | |
| C | ** | * | n.s. | |
| Leaf N concentration (mg g−1) | A | * | * | n.s. |
| B | ** | * | n.s. | |
| C | * | n.s. | n.s. | |
| Leaf sugar concentration (mg g−1) | A | n.s. | n.s. | n.s. |
| B | * | n.s. | n.s. | |
| C | * | n.s. | n.s. | |
| The sugar-to-nitrogen concentration ratio (%) | A | * | n.s. | n.s. |
| B | * | n.s. | n.s. | |
| C | * | n.s. | n.s. |
Note:aA, B, and C denote three successive growth stages: August 16th, September 6th, and September 17th, respectively.
bProbability levels are indicated by n.s., *, and ** for ‘not significant’, P < 0.05, and P < 0.01, respectively.