degradation in poultry manure: how to express concentrations ? Leo - - PowerPoint PPT Presentation

London, 23 June 2009 1/6

degradation in poultry manure: how to express concentrations ?

Leo Van Leemput Janssen Animal Health a division of Janssen Pharmaceutica

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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

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• bservation

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)

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some results (1)

20 40 60 80 100 120 1 2 3 4 5 6 7 8 weeks of incubation % recovery extracted unextracted volatilised total

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some results (2)

60 65 70 75 80 85 90 95 100 1 2 3 4 5 6 7 8 weeks of incubation % extracted unmixed peat soil straw wood

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conclusions

poultry manure behaves different from cattle or pig slurry not liquid, low moisture content concentration on an ash content basis