AL1

LL

P3

−LY

+LY

−LY

+LY

SEM2

D

LY

D × LY

Physicochemical parameters

pH

5.95a

5.95a

6.19b

6.07b

0.02

<0.0001

0.27

0.15

Eh4, mV

−166a

−167a

−147b

−140b

1.7

<0.0001

0.72

0.0002

rH4

6.36a

6.33a

7.48b

7.46b

0.07

<0.0001

0.88

0.001

Fermentative parameters

Total VFA, mM

94.3b

89.6ab

84.1a

91.3b

1.4

0.006

0.75

0.005

C2, mM

49.6a

48.9a

48.7a

53.6b

0.68

0.24

0.13

0.012

C3, mM

28.7c

25.9b

18.5a

16.7a

0.56

<0.0001

0.0001

0.77

C4, mM

9.9a

9.8a

12.2b

16.5c

0.36

<0.0001

<0.0001

<0.0001

C2/C3

1.7a

2.0b

2.9c

3.3c

0.06

<0.0001

0.0001

0.33

C5, mM

4.0b

3.0a

2.6a

2.4a

0.11

<0.0001

0.001

0.006

IC4, mM

0.71b

0.66b

0.56a

0.66b

0.01

<0.0001

0.19

0.0009

IC5, mM

1.2a

1.3a

1.4b

1.3b

0.04

0.0002

0.71

0.60

NH3-N, mg/L

81.2

81.6

33.1

37.9

3.3

<0.0001

0.99

0.53

Lactic ac.5, mM

6.0

4.9

4.3

4.8

0.67

0.11

0.91

0.80