Mixed silage of Elodea and wheat straw as a substrate for energy production in anaerobic digestion plants

Table 3 Methane production from Elodea and Elodea-straw mixture silages after 180 days of storage

Silage	Specific methane yield (mL g⁻¹ VS)
EN without ensiling	242.2 ± 36.4^a
EN	218.6 ± 12.5^a
ESC1	205.7 ± 12.5^{a, b}
ESC2	166.1 ± 13.1^b
ESG1	228.3 ± 27.6^a
ESG2	224.5 ± 9.8^a
Pz	***
Pz × Sb	**
EN biomass	n.s.
WS	n.s.
SC1¹	235.9 ± 10.6
SC2²	214.2 ± 7.7
SG1³	275.4 ± 10.3
SG2⁴	243.8 ± 6.0

Different superscript letters in the same column indicate significant difference at p < 0.05
Pz straw particle size effect, Pz × Sb interaction particle size × substrate, EN E. nuttallii biomass effect, WS wheat straw biomass effect, n.s. not significant
¹SC1 chopped straw at 30% TS
²SC2 chopped straw at 45% TS
³SG1 ground straw at 30% TS
⁴SG2 ground straw at 45% TS
^{1, 2, 3, 4}Data from Gallegos et al. [6]
*p < 0.05, **p < 0.01, ***p < 0.001