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Symbiotic N2 fixation by soybean in organic and conventional cropping systems

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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