Figure 1From: Ensiling of crops for biogas production: effects on methane yield and total solids determinationMethane yields of fresh frozen and ensiled crops. Methane yields expressed as (a) l per kg wet weight (WW) (left), and (b) l per kg volatile solids (VS) (right). The methane yields are given above the bars. Error bars denote 1 SD, n = 3.Back to article page