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Large variation in nitrogen efficiency among organic and non-organic farms Organic Eprints
Hansen, Sissel; Koesling, Matthias; Schüler, Maximilian; Fystro, Gustav; Bleken, Marina Azzaroli.
Agricultural production is requested to be environmental friendly and resource efficient. A literature review of farm surveys and prototype farm studies found that increasing use of N fertilizer and imported feed increased the yields and the productivity of dairy farms, but also increased the N-surplus. We studied the N-efficiency and cause of variation in organic and non-organic commercial dairy farms. Increased amount of purchased-N per ha farmland increased the farm N-surplus per ha on organic and non-organic farms. Increased amount of purchased-N tended to decrease N-efficiency, but not on non-organic farms. The correlation between the N-surplus per unit of produce and N-purchase was weak. The organic farms had lower N-surplus per ha than the...
Tipo: Conference paper, poster, etc. Palavras-chave: Production systems; Dairy cattle; Farm nutrient management.
Ano: 2016 URL: http://orgprints.org/31205/1/Hansen%20et%20al.%202016.%20LARGE%20VARIATION%20IN%20NITROGEN%20EFFICENCY%20AMONG%20ORGANIC%20AND%20NON-organic%20dairy%20farms_27%20-29%20June%2C%20Skara%20Sweden%2C%20pp%2082-83%2C%20Abstract.pdf
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Stickstoffeffektivität von Milchviehbetrieben Organic Eprints
Koesling, Matthias; Hansen, Sissel; Fystro, Gustav.
Die Nitrogeneffektivität im Jahr 2010 wird auf zehn ökologisch wirtschaftenden Milchviehbetrieben und zehn konventionellen untersucht. Vorläufige Resultate werden präsentiert und die verwendete Methode diskutiert. Die Effektivität wird aus Netto-Ex- durch Netto-Import berechnet. Die Nitrogenfixierung durch Klee hatte großen Einfluss auf die berechnete Nitrogen-Effektivität. Da es große Variation von Jahr zu Jahr und Unsicherheit bei dem Anschlag für die Nitrogenfixierung (durch Estimierung der Rauhfuttererträge, des Kleeanteils und wie viel Nitrogen pro Kilogramm geerntetem Klee fixiert wurde), sollten die angegebenen Werte für die berechnete Nitrogen-Effektivität nicht als absolut angesehen werden. Die Unterschiede in der Flächenausstattung, dem...
Tipo: Conference paper, poster, etc. Palavras-chave: Dairy cattle; Farm nutrient management.
Ano: 2013 URL: http://orgprints.org/21568/1/21568_Koesling.pdf
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Vereinfachte Berechnung der Grauen Energie in Gebäuden Organic Eprints
Koesling, Matthias; Fystro, Gustav; Ruge, Gesa; Hansen, Sissel.
A simple building component framework for agricultural buildings has been adapted to estimate their embodied energy. Based on the results from a case study of 20 dairy farms in Norway we conclude that the amount of embodied energy in buildings is a variable but notable component and highlight the important factors for this variation. This research advances knowledge and practice of embodied energy calculations for existing farm buildings. The findings advance overall energy consumption and future planning of farming buildings and businesses.
Tipo: Conference paper, poster, etc. Palavras-chave: Buildings and machinery.
Ano: 2015 URL: http://orgprints.org/27224/1/27224_koesling.pdf
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