Table 1 Differences in physico-chemical soil properties for each site and treatment after 17 months.

From: Conversion of marginal land into switchgrass conditionally accrues soil carbon but reduces methane consumption

Variable

Silt loam fallow

Silt loam switchgrass

Kruskal–Wallis tests

Clay loam fallow

Clay loam switchgrass

Kruskal–Wallis tests

 

Mean ± SD

Mean ± SD

Chi-squared

p

Effect size

Mean ± SD

Mean ± SD

Chi-squared

p

Effect size

pH

6.5 ± 0.67

6.7 ± 0.95

1.32

0.25

-

5.73 ± 0.44

5.85 ± 0.57

2.17

0.14

-

Soil moisture (%)

7.1 ± 4.1

8.7 ± 6

3.27

0.07

-

10.4 ± 6.8

9.82 ± 5.5

0.75

0.39

-

Total soil C (%)

0.47 ± 0.09

0.61 ± 0.12

118

< 0.0001***

0.40*** Large

1.3 ± 0.42

1.3 ± 0.36

0.86

0.40

-

Total soil N (%)

0.06 ± 0.01

0.07 ± 0.01

55.4

< 0.0001***

0.19** Medium

0.11 ± 0.02

0.11 ± 0.02

0.27

0.6

-

Phosphorus (ppm)

55.6 ± 13

73.7 ± 9.7

128

< 0.0001***

0.44*** Large

22.6 ± 9.7

17.5 ± 6.5

27.7

< 0.001**

0.095** Medium

Nitrate (ppm)

3.5 ± 3.7

2.2 ± 3

16.8

< 0.001**

0.06* Small

8.3 ± 9.8

8.9 ± 15

2.37

0.12

-

Ammonium (ppm)

13.6 ± 11

14.5 ± 10

1.73

0.19

-

18.5 ± 11

17.9 ± 11.5

0.61

0.44

-

  1. Values are mean ± SD values and significance was tested by Kruskal–Wallis rank sum test (n = 588). Astreriks (*) indicate significance of p-values.
  2. *Effect size shown by epsilon squared with *small (0.01–<0.08), **medium (0.08–<0.26), and ***large (≥0.26) ranges.
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