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Table 2 Mean root mass and length of Veronese poplar trees 3 years after establishment from poles

From: Early root development of field-grown poplar: effects of planting material and genotype

 

Root mass (g)

Root length (m)

 

Root diameter (mm)

Root diameter (mm)

Factor

<2

2 < 5

5 < 10

10 < 20

≥20

1 < 2

2 < 5

5 < 10

10 < 20

≥20

Soil depth (m)

          

 0 < 0.5

11.1a (2.0)

29.8a (6.4)

96.1a (19.3)

114.1 (32.6)

120.4 (67.3)

7.3a (1.6)

10.3a (1.8)

6.7a (1.4)

2.6 (0.6)

2.2a (0.4)

 ≥0.5

2.0b (0.4)

10.1b (2.4)

28.4b (6.4)

66.2 (25.4)

11.8 (9.1)

1.2b (0.3)

2.6b (0.5)

1.7b (0.4)

1.0 (0.3)

1.1b (0.2)

  P value

<0.001

0.004

<0.001

0.556

0.087

<0.001

<0.001

<0.001

0.102

0.040

Width (m)

          

 0 < 0.5

10.7a (2.4)

27.0 (7.1)

77.3 (19.1)

199.5 (74.7)

93.2 (54.7)

5.8a (1.6)

8.8 (1.9)

4.2 (1.1)

3.3 (0.9)

2.6 (0.6)

 0.5 < 1.0

3.5b (0.8)

13.9 (3.9)

37.2 (9.7)

45.9 (18.1)

27.4 (21.5)

2.4b (0.7)

4.2 (1.0)

3.4 (0.9)

1.2 (0.4)

1.4 (0.4)

 ≥1.0

3.7b (0.9)

17.9 (5.3)

70.0 (19.3)

88.7 (40.0)

103.9 (180.1)

2.6b (0.8)

5.2 (1.3)

4.0 (1.1)

2.1 (0.7)

1.1 (0.3)

  P value

0.002

0.190

0.184

0.084

0.689

0.047

0.054

0.794

0.141

0.067

Depth × width

          

  P value

0.029

0.049

0.010

0.250

0.261

0.072

0.145

0.044

0.187

0.067

  1. Within factors within columns, means with different letters differ significantly at P = 0.05. P values that were significant (P < 0.05) are shown in italics. Figures in brackets are standard errors