degradation in poultry manure: how to express concentrations ? Leo Van Leemput Janssen Animal Health a division of Janssen Pharmaceutica London, 23 June 2009 1/6
the experiment (1988) � radiolabelled test substance given to chickens � collect excreta � incubate in flow-through transformation system � unmixed � mixed (50/50) with � peat � straw � wood chips � soil � follow material balance as a function of time � volatile radioactivity � extractable radioactivity � unextractable radioactivity 2/6
observation � high biochemical activity, violent transformation � radioactivity concentrations expressed as: � wet weight of incubate � dry weight (24 h at 120 °C) of incubate seemed to increase with time ! � disappearance of water transformation of natural constituents � refer to ash content (3 h at 550 °C) 3/6
some results (1) 120 % recovery 100 80 extracted unextracted 60 volatilised total 40 20 0 0 1 2 3 4 5 6 7 8 weeks of incubation 4/6
some results (2) % extracted 100 95 unmixed peat soil 90 straw wood 85 80 75 70 65 60 0 1 2 3 4 5 6 7 8 weeks of incubation 5/6
conclusions � poultry manure behaves different from cattle or pig slurry � not liquid, low moisture content � concentration on an ash content basis 6/6
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