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Table 1 Root parameters under each combination of water and nitrogen condition

From: The influence of nitrogen availability on anatomical and physiological responses of Populus alba × P. glandulosa to drought stress

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**
  1. 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