Nanzer, Simone; Frossard, Emmanuel; Bosshard, Christine; Dubois, Davie; Mäder, Paul and Oberson, Astrid (2009) Symbiotic N2 fixation by soybean in organic and conventional cropping systems. Poster at: 10. Wissenschaftstagung Ökologischer Landbau, Zürich, 11.-13. Februar 2009.
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Summary
In organic cropping systems nitrogen (N) often limits agricultural production. N2 fixing
crops present an important option to improve N supply and to maintain soil fertility. We
investigated N2 fixation of soybean in conventional and organic cropping systems. The
study was carried out on a long term field experiment, characterized by unequal
fertilization rates and soil microbial activity for the different systems. We assessed the
proportion of N derived from atmosphere (Ndfa) and the total amount of N
symbiotically fixed (Nfix) using the 15N natural abundance method. Ndfa for soybean
was low, ranging from 24 to 54%. The lowest Ndfa was reported for the exclusively
mineral fertilized, and the highest for the bio-organic cropping system. However, there
were no differences between the farming systems in total amount of N symbiotically
fixed. Irrespective of the cropping system, N withdrawal by harvest was higher than N
input by N2 fixation, meaning that soil N stock was not preserved.
| EPrint Type: | Conference paper, poster, etc. |
|---|---|
| Type of presentation: | Poster |
| Keywords: | Stickstofffixierung, Soja, DOK-Versuch, Natürliche Abundanzmethode |
| Subjects: | Farming Systems > Farm nutrient management |
| Research affiliation: | International Conferences > 2009: Scientific Conference on Organic Agriculture > Pflanze und Boden > Pflanzenernährung; N2-Fxierung |
| Related Links: | http://www.wissenschaftstagung.de/, http://www.verlag-koester.de/buch.php?id=645&start=0&fb_id=37 |
| Deposited By: | Nanzer, Simone |
| ID Code: | 14124 |
| Deposited On: | 16 Apr 2009 |
| Last Modified: | 12 Apr 2010 07:37 |
| Document Language: | German/Deutsch |
| Status: | Published |
| Refereed: | Peer-reviewed and accepted |
| Additional Publishing Information: | Dieser Beitrag ist im Tagungsband der 10. Wissenschaftagung erschienen: Mayer, J.; Alföldi, T.; Leiber, F.; Dubois, D.; Fried, P.; Heckendorn, F.; Hillmann, E.; Klocke, P.; Lüscher, A.; Riedel, S.; Stolze, M.; Strasser, F.; van der Heijden, M. and Willer, H., (Hrsg.) (2009) Werte – Wege – Wirkungen: Biolandbau im Spannungsfeld zwischen Ernährungssicherung, Markt und Klimawandel. Beiträge zur 10. Wissenschaftstagung Ökologischer Landbau, Zürich, 11.-13. Februar 2009. Band 1: Boden, Pflanzenbau, Agrartechnik, Umwelt- und Naturschutz, Biolandbau international, Wissensmanagement Band 2: Tierhaltung, Agrarpolitik und Betriebswirtschaft, Märkte und Lebensmittel. Verlag Dr. Köster, Berlin. Der Tagungsband kann beim Verlag Dr. Köster bezogen werden; siehe http://www.verlag-koester.de/buch.php?id=645&start=0&fb_id=37 |
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