The efficient and environmentally friendly application of biogas digestates on permanent grassland is not yet cleared. Effects of separated fermentation substrates are to be investigated on the botanical composition, the DM yields and the soil mineral contents (year wise at the end of the season) in comparison to mineral and zero fertilisation on permanent grassland.
We expect clear results about fertilization of liquid and solid fractions of biogas digestates on permanent grasslands in order to give advices for dairy and biogas farmers.
We expect more information about the handling of thick fractions in water protection area II. Additionally effects on transportation costs per unit nutrients in the solid fraction are awaited.