Is bio- slurry from household digesters a better fertilizer than manure? A literate review.

In many developing countries manure is anaerobically digested to produce biogas. The residue of manure digestion, bio-slurry, can be used as fertilizer for crop production and aquaculture. This study compared bio-slurry and manure as fertilizers. Nutrients in bio-slurry, especially nitrogen, are more readily available then in manure, leading to a larger short term fertilisation effect. However, risks for N losses through volatilisation and leaching are large for bio-slurry than for manure during
storage, handling and application. Unfortunately, most studies that compared bio-slurry and manure exhibited methodological shortcomings that hamper an adequate comparison.

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