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Phosphor-Bodenbilanzen von Grünland- und Ackerflächen auf einem ökologischen Milchviehbetrieb

Ohm, Magdalena; Schüler, Maximilian and Paulsen, Hans Marten (2015) Phosphor-Bodenbilanzen von Grünland- und Ackerflächen auf einem ökologischen Milchviehbetrieb. Paper at: 13. Wissenschaftstagung Ökologischer Landbau, Hochschule für nachhaltige Entwicklung Eberswalde, 17. - 20. März 2015.

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Summary

Mineral phosphorus (P) fertilizers from fossil reserves are finite which puts agriculture at risk of losing soil fertility. This study calculates P soil balances of an organic dairy farm in Northern Germany to focus on potentials and variations in the farm P cycle. P flows were different between the years because yield levels and amount of manure application varied. Different plant species showed different P export which depended mainly on biomass export. This can also be seen as their site specific mobilization potential. The highest mean P export between 2010 and 2012 was measured with maize (mean 30.4, range 17.7-38.2 kg P ha-1 a-1) and grass-clover (mean 23.7, range 17.3-29.5 kg P ha-1 a-1). By grazing, permanent grassland showed a mean P mobilization from soil P of 15.9 kg ha-1 a-1. The annual soil P balance was -7.96 kg P ha-1 (range -6.16 to -9.3 kg P ha-1) at permanent grassland and -11.1 kg P ha-1 at arable land (range -1.5 to -17.7 kg P ha-1). Because of the high ranges it is reasonable to analyze a few years to get a better view on P flows at farms. High PCAL values from historical fertilizer inputs can be seen as a P source in short term and can especially be mobilized by permanent grassland. It is necessary to change the P flows into a more sustainable way before the P gap cannot be closed by soil reserves anymore and P deficit will limit plant growth.


EPrint Type:Conference paper, poster, etc.
Type of presentation:Paper
Keywords:Bodenreserven, Ackerbau, Phosphor Mobilisierung, Nährstoffflüsse
Subjects: Farming Systems > Farm nutrient management
Research affiliation: Germany > Federal Research Institute for Rural Areas, Forestry and Fisheries - VTI > Institute of Organic Farming - OEL
International Conferences > 2015: Scientific Conference of the German Speaking Countries > Plant & soil
ISBN:978-3-89574-885-1
DOI:27197
Related Links:http://www.wissenschaftstagung.de/
Deposited By: Ohm, Magdalena
ID Code:27197
Deposited On:22 Jun 2015 14:39
Last Modified:13 Jan 2016 10:30
Document Language:German/Deutsch
Status:Published
Refereed:Peer-reviewed and accepted
Additional Publishing Information:Dieser Beitrag ist im Tagungsband der 13. Wissenschaftstagung erschienen.
Häring, A.M., Hörning, B., Hoffmann-Bahnsen, R., Luley, H., Luthardt, V., Pape, J., Trei, G. (Hrsg.)(2015):
Am Mut hängt der Erfolg - Rückblicke und Ausblicke auf die ökologische Landbewirtschaftung.
Beiträge zur 13. Wissenschaftstagung Ökologischer Landbau, Hochschule für nachhaltige Entwicklung Eberswalde, 17.-20. März 2015
Verlag Dr. Köster, Berlin

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