Effects of fertilisation with biogas residues on crop yield, soil microbiology and greenhouse gas emissions

摘要: The amount of residues generated by biogas production has increased dramatically due to worldwide interest in using renewable energy. Biogas (BRs) originate from anaerobic degradation different types rural and urban organic wastes have been proposed as fertilisers because their high content ammonium other valuable macro- micro-nutrients. However, application BRs agricultural soils may be accompanied environmental risks, since they contain heavy metals pollutants. Therefore the effects on crop soil ecosystem environment urgently need investigated before wider use. This thesis evaluated compared against cattle slurry, pig compost mineral fertiliser with respect (1) ability provide plants necessary nutrients, (2) impact microbial (3) emissions greenhouse gas nitrous oxide (N₂O). results short-term laboratory experiments a long-term field trial showed that yield same extent or more than conventional compost, but less slurry. source-separated household waste had tendency give higher activities BRs. no general negative effect respiration, substrate-induced respiration decreased significantly addition Although all initially inhibited potential oxidation denitrification activity, were detected. stimulated assimilation, which can temporarily decrease nitrogen availability plant. Furthermore, bacterial community structure sandy was altered significant change seen clay soil. Application animal slurry N₂O emissions, total losses flux patterns affected type type. In conclusion, value should regarded apparently adverse functions structures. Thus problematic amounts associated expansion could turned advantage, these seem safe competitive fertilisers.