Human urine and effluents from digestion of food refuse as a fertiliser to barley - crop yields, ammonia emission and nitrate leakage

摘要

A field trial investigating the fertilising effect of stored human urine, effluents from digested food refuse and mineral fertilisers applied to barley was performed in 1997 on a farm south of Stockholm. Nitrogen efficiency and influence on yield and grain quality was studied. Ammonia emissions were measured after application of human urine. The risk of nitrate leakage was just as high from organic as from mineral fertiliser used. A nutrient balance of nitrogen added and nitrogen removed from the fields by the crops verifies that large inputs increases residual nitrogen. These are results from just one year of field trials and more experiments are needed to study plant nutrient efficiency and to measure nitrogen losses. The study will continue in 1998.