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Table 3 Components of energy inputs in calculation of GHG emissions for cocksfoot grass production and processing into biogas in seven annual growing cycles

From: The effect of digestate and mineral fertilisation of cocksfoot grass on greenhouse gas emissions in a cocksfoot-based biogas production system

Only in year 1 of grass growthFor all 1–7 years of grass growth
Direct energy input with subsequent direct GHG emissionsIndirect energy input with subsequent indirect GHG emissionsDirect energy input with subsequent direct GHG emissionsIndirect energy input with subsequent indirect GHG emissions
Soil tillageAgricultural machineryCuttingAgricultural machinery
Soil cultivationFertilisersRakingFertilisers
SowingSeedsChopping and collectionHuman work
FertilisationHuman workTransportation 
Cutting Ensiling 
  Anaerobic digestion 
  Spreading of digestate