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To achieve implementation of sustainable agriculture practices and implement circular bioeconomy in farms, agricultural waste and residuals commonly are used as feedstock for biogas production that is in line with European Union strategy to reduce methane emissions. Anaerobic digestion of feedstock results in production of the digestate. Digestate, on the one hand, is valuable fertilizer that can substitute synthetic fertilizers. On the other hand, it is associated with methane (CH4), ammonia (NH3) emissions and n...