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Gewählte Publikation:

Kuderna, M; Blum, WEH.
(1998): N-fluxes and efficiencies on farms in Styria, Austria

N-fluxes and efficiencies were investigated on three typical pig farms of the Leibnitzer Feld, Styria, Austria. The farms ranged from 26 to 30 ha in size and had 100-200 fattening pigs and 25 brood-sows. Fattening was mainly based on maize and purchased soycake. The N-budget (= sum of all N-inputs = sum of all N outputs) of the farms were similar in relation to Austrian livestock units, DGVE, (146 kg N DGVE(-1) year(-1) to 162 kg N DGVE(-1) year(-1)) and averaged 181 kg N ha(-1) year(-1) to 240 kg N ha(-1). 43-54% of the total N-inputs were due to fertiliser-N, 28-40% to food-purchase, and 12-17% to atmospheric deposition. 9-23% of the total N-outputs were for sold plant products, 11-16% for sold pigs and 24-33% for ammonia emissions from pig-housing and slurry storage. The rest, remaining in the soil, was 37-57%. Additional investigations with field lysimeters showed that almost all of it was washed out as NO3-. The N-efficiency of plant production as determined on the farms was 59%, animal production had an N-efficiency of up to 25%. 44%-67% of all N excreted by the pigs was lost through NH3-emissions from housing and slurry storage. Comparative investigations on the key components of the farms, maize cropping and pig fattening, were undertaken in order to find out, if changing the N-inputs would improve their N-efficiency and reduce N-losses. For maize cropping a relation of decreasing N-efficiency for increasing N-inputs was determined. Additionally it was found that for a given amount of yield (which was supposed to be necessary for the existing livestock) a small increase of the cultivated area would result in a considerable decrease of the unused fertiliser-N. For pig fattening a reduction of the protein content of the feed would reduce the N-excretions in absolute figures, but the N-efficiency would decrease.
Autor*innen der BOKU Wien:
Blum Winfried E.H.
BOKU Gendermonitor:

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