Most of agricultural biogas plants in Germany and Poland bases on maize silage as a main biogas substrate.
However increase of silage demand resulted in significant growth of its price (30 EURO per ton). It influenced on
economic balance of those biogas plants. According to some sources over 25 percent of German biogas plants
collapsed by bankruptcy in the years 2007-9. Other problem is that upsurge of maize on arable area results in
monoculture of this plant in the Eastern Germany. Situation in Poland is going to the similar direction. After one
year of work the biggest Polish biogas plant in Liszkowo almost passed by bankruptcy because of lack of substrate.
Hence necessary are research on finding alternative to maize silage, effective biogas substrate. Observing that food