Fig. 3From: Anaerobic digestion of mixed silage of waterweed biomass and wheat straw in a long-term semi-continuous biogas production processBuffer capacity (TAC) and concentrations of water-soluble elements. Buffer capacity (a), concentrations of calcium (b), magnesium (c), phosphorus (d), sodium (e) and potassium (f) in the course of semi-continuous fermentation using Elodea straw silage as mono-substrateBack to article page