14308 1 archive 5679 disk0/00/01/43/08 2009-04-15 2009-08-20 14:40:40 2009-08-20 14:40:40 conference_item show 0 de 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 int_conf_2009_wita_6_international ch-fibl-international 10.-13. Februar 2009 10. Wissenschaftstagung Ökologischer Landbau ETH Zürich, Schweiz yes 0 ftp://ftp.fao.org/paia/organicag/ofs/OFS-2007-1.pdf http://www.wissenschaftstagung.de/ http://www.verlag-koester.de/buch.php?id=645&start=0&fb_id=37 TRUE paper Zundel C. Musyoka M. Baruah R. Kilcher L. Muriuki A. Vanlauwe B. Chabi-Olaye A. Mucheru M. Mäder P. pub 2security 7biodiversity Long-term experiments, production systems, tropics, crop farming Organic agriculture is more and more perceived as a promising approach to increase food security in developing countries. However, only few attempts have been made so far to assess agronomic and economic performance of organic agriculture in these regions in a systematic way. This article reports the first year’s results of two long-term farming systems comparison field trials in Kenya and India. In sub-humid Central Kenya, on a high potential site in Meru South District (Chuka), there were no differences between yields of conventional and organic systems for the first maize and brassica crops. In contrast, organic yields were 14 to 60% lower than conventional yields on a trial site in a medium potential zone in Maragua District (Thika). It is assumed that the organic crops in Chuka could benefit from N and P mobilisation from the soil. In Thika, where N and P were less available, the crop depended on the easily soluble nutrients applied in the conventional treatments. In the semi-arid cotton belt of Central India, biodynamic, organic, conventional and genetically modified (GM) cotton are compared. Soya and wheat are also part of the crop rotation under study. Biodynamic and organic cotton and wheat yields were 30% lower than conventional and GM yields. Soya yields did not differ between the treatments. It is suggested that yield in organic farming systems in conversion depends on initial inherent soil fertility and crop. 2009 published public 9433 1 14308 1 application/pdf de public

Zundel_14308.pdf

Zundel_14308.pdf 47104 http://orgprints.org/14308/1/Zundel_14308.pdf