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Table 1 Soil and plant responses to rainfall, Si-application and simulated grazing (clipping) treatments from linear/mixed models

From: Silicon uptake by a pasture grass experiencing simulated grazing is greatest under elevated precipitation

Response variable

Fig.

Rainfall

Si-application

Clipping

Rainfall × Si–application

Rainfall × Clipping

Si–application × Clipping

Rainfall × Si–application × Clipping

F 2,60

P

F 1,60

P

F 1,60

P

F 2,60

P

F 2,60

 

F 1,60

 

F 2,60

 

Soil characteristics

 Soil moisture

1B

364.80

< 0.001

22.47

< 0.001

0.04

0.850

6.87

0.002

0.03

0.970

0.04

0.833

0.44

0.646

 Soil Sib

2A

3.08

0.053

59.63

< 0.001

1.41

0.240

1.96

0.150

0.41

0.667

0.02

0.903

0.04

0.959

 Soil C

–

2.66

0.078

2.41

0.125

0.55

0.461

0.10

0.908

0.28

0.760

0.01

0.984

0.97

0.386

 Soil Na

–

2.37

0.102

0.01

0.952

0.05

0.819

0.16

0.856

0.77

0.468

0.01

0.927

1.06

0.352

Plant growth

 Heighta

–

5.89

0.005

4.29

0.043

0.96

0.332

0.34

0.715

0.16

0.852

1.26

0.266

0.05

0.956

 Tiller number

1C

43.95

< 0.001

1.27

0.265

5.57

0.022

2.15

0.125

0.46

0.632

0.01

0.953

0.09

0.913

 Root massa

1D

9.33

< 0.001

2.99

0.089

0.64

0.426

0.78

0.465

0.32

0.726

0.44

0.512

0.21

0.814

Plant chemistry

 Root Si

2B

4.02

0.023

0.01

0.972

7.28

0.009

0.24

0.789

0.01

0.998

0.07

0.796

0.04

0.960

 Shoot Si

2B

40.78

< 0.001

0.88

0.353

42.04

< 0.001

2.83

0.066

2.30

0.109

0.01

0.963

0.41

0.664

 Root/shoot Sib

2B

18.75

< 0.001

1.44

0.235

12.42

< 0.001

1.85

0.166

0.02

0.979

0.01

0.992

0.02

0.984

 Root C

2C

7.60

< 0.001

0.13

0.720

5.86

0.019

0.34

0.714

0.32

0.725

0.01

0.953

0.25

0.780

 Shoot C

2C

32.31

< 0.001

0.03

0.862

52.14

< 0.001

2.76

0.072

2.14

0.127

0.07

0.788

0.08

0.920

 Root N

–

31.58

< 0.001

0.01

0.934

3.77

0.057

0.08

0.923

1.29

0.282

0.37

0.545

0.35

0.706

 Shoot Nc

–

1.72

0.187

0.07

0.796

0.99

0.323

2.89

0.063

2.74

0.072

0.21

0.651

0.09

0.918

  1. P-values highlighted in italic indicate significance (P < 0.05). Where appropriate, response variables were transformed (alog, bsquare root, cexp) before analysis. Height represents the height over time before the clipping treatment was applied