Nitrogen

Water

Root Length (cm)

Root SurfArea (cm^{2})

Number of Root Tips

Fine Root Length (cm)

Fine Root SurfArea (cm^{2})


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 Twoway 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 twoway ANOVA is denoted by: *0.05 > p > 0.01, **p < 0.01