A further part of this study should help solve these crucial problems:

1. What is the rational utilisation of digestate and/or fugate and separated solid fraction of digestate in the agriculture sector that are generated by current biogas plants if we know that their utilisation as fertilisers is rather problematic?

2. What are the prospects of utilisation of wastes from biogas production and what modifications in the technology of biogas production from agricultural wastes should be introduced?

3. What problems should be solved by researchers so that the promising utilisation of wastes from biogas production could be realised?

4. What is the optimum form of utilisation of wastes from biogas plants and why?

3. Information