Fig. 1

Correlation between lipids, hemicellulose, cellulose, lignin, and non-structural carbohydrates contents and experimental methane yield (a–e, respectively) of 20 kinds of leafy vegetables
Correlation between lipids, hemicellulose, cellulose, lignin, and non-structural carbohydrates contents and experimental methane yield (a–e, respectively) of 20 kinds of leafy vegetables