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Storing energy crops for methane production: Effects of solids content and biological additive

Research output: Contribution to journalArticleScientificpeer-review


Original languageEnglish
Pages (from-to)7074-7082
Number of pages9
JournalBioresource Technology
Issue number15
Publication statusPublished - Oct 2008
Externally publishedYes
Publication typeA1 Journal article-refereed


The effect of storage on chemical characteristics and CH4 yield (taking into account loss of VS during storage) of a mixture of grasses and ryegrass, ensiled as such (low solids content) and after drying (medium and high solids) with and without biological additive, were studied in field and laboratory trials. Up to 87% and 98% of CH4 yield was preserved with low solids grass (initial TS 15.6%) and high solids ryegrass (initial TS 30.4%), respectively, after storage for 6 months, while under suboptimal conditions at most 37% and 52% of CH4 yield were lost. Loss in CH4 yield was mainly due to VS loss, presumably caused by secondary fermentation as also suggested by increasing pH during storage. Biological additive did not assist in preserving the CH4 yield.