Raw materials
Three different species were tested: maize (Zea mays L. ssp.),
cultivar Companero; rye (Secale cereal ), cultivar Carotop; and
clover grass from a seed mixture ForageMax 42 (DLF Trifolium,
Denmark). All crops were produced in 2007e2008 on the test
field of National Laboratory for Sustainable Energy, Technical
University of Denmark (Risø DTU) (55410N, 12050E). All the
raw materials were wet biomass of which the composition of
cellulose, hemicelluloses, lignin, starch and fructose is shown
in Table 1. Fresh crops have a dry matter (DM) content of 16.5%
for fresh rye, 18.4% for clover grass and 32.1% for maize
whereas the ensiled crops had a 5e10% lower dry matter
content compared to the fresh ones (Table 1).