The digestate was assumed to be transported back to the farm.
During storage of digestate, emissions of methane and nitrous
oxide can occur. IPCC (2006b) has developed a method for estimating
methane and nitrous oxide emissions from storage of manure.
In the absence of better data this calculation method can also be
used for digested energy crops. We however adjusted the IPCC
(2006b) method by using emission factors for Swedish conditions
given by Dustan (2002).