Slurry Pits and Coverings
If the slurry tank is not sufficiently covered, approximately 15% of the nitrogen in the slurry can evaporate. An evaporation of this size will deteriorate the nutritive value of the slurry and subsequently result in a deteriorated output in the field. The ammonia emission can moreover damage the surrounding nature and water areas and present a serious nuisance to the neighbours. As a consequence it has in Denmark been decided, that slurry tanks must be covered by either a solid cover or a tight floating layer.
A tight covering is a lasting solution and can e.g. consist of a tent covering or a solid cover. Tight coverings will besides a higher output in the field keep the rainwater from entering the slurry tank, which will increase the storage capacity as well as save money in concern with the spreading.
The cheapest type of covering is a natural floating layer consisting of e.g. stable manure or chopped straw. A so-called floating barrage can secure that storm will not cause open slurry surfaces on the slurry tank.
