Table 1.
Root parameters under each combination of water and nitrogen condition
| Nitrogen | Water | Root Length (cm) | Root SurfArea (cm2) | Number of Root Tips | Fine Root Length (cm) | Fine Root SurfArea (cm2) |
|---|---|---|---|---|---|---|
| Well Watered | Low Nitrogen | 1311.7 a ±155.0 | 385.5 a ±43.2 | 1056.4 a ±838.4 | 672.8 a ±97.9 | 23.9 a ±3.4 |
| Adequate Nitrogen | 1190.3 a ±95.5 | 388.6 a ±72.1 | 877.6 ab ±451.7 | 564.2 a ±53.2 | 20.1 a ±1.9 | |
| Drought | Low Nitrogen | 674.1 b ±198.3 | 191.0 b ±60.8 | 535.4 b ±243.5 | 313.2 b ±94.2 | 11.2 b ±3.4 |
| Adequat Nitrogen | 1422.3 a ±147.8 | 431.1 a ±48.3 | 1174.8 a ±572.8 | 735.5 a ±84.7 | 26.2 a ±3.1 | |
| F Value of Two-way ANOVA | Nitrogen (N) | 4.3* | 4.7* | 3.5 | 3.6 | 3.6 |
| Water (W) | 1.8 | 1.8 | 0.8 | 1.3 | 1.3 | |
| N × W | 8.4** | 4.5* | 10.9** | 10.3** | 10.4** |
SurfArea: root surface area. Means with different letters are statistically different in multiple comparisons between treatments at the 5% level in ANOVAs. Level of significance of F value in two-way ANOVA is denoted by: *0.05 > p > 0.01, **p < 0.01