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Origins of blockages during the spreading of liquid manure
Florence Thirion, D. Debroize
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Abstract
Application of animal liquid manure with trailing hoses or injectors decreases ammonia emissions, optimises agronomic efficiency and enables precision fertilising. The major drawback of this technique is its cost, but reluctance is also increasing due to frequent blockages during spreading of cattle slurry. A survey has been conducted in 20 farms where liquid manure is spread with trailing hoses. It was stated that the most frequent blockages were due to straw pieces. From examination of slurry samples, a relationship could be established between blockage frequency and two characteristics of the slurry : dry matter content and total length of straw pieces. The risk of blockage could also be assessed by means of a "clogging meter" which appeared to be a reliable tool for predicting whether a particular type of manure will be easily spread or not, and then giving the farmer information on the possibility of using trailing hoses or injectors.