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N supply in stockless organic cereal production under northern temperate conditions. Undersown legumes, or whole-season green manure?

Løes, Anne-Kristin; Henriksen, Trond Maukon and Eltun, Ragnar (2007) N supply in stockless organic cereal production under northern temperate conditions. Undersown legumes, or whole-season green manure? Paper at: 3rd QLIF Congress: Improving Sustainability in Organic and Low Input Food Production Systems, University of Hohenheim, Germany, March 20-23, 2007.

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Summary

Two systems for nitrogen (N) supply to organic spring cereals were compared under Norwegian conditions. Repeated undersowing of clover in the cereals in four growing seasons was compared to a whole-season green manure in the second year. Cereal yields were higher in the treatments with clover than in the controls. The yield increasing effect of undersown clover was residual. One year of whole-season green manure increased subsequent cereal yields significantly, but not enough to compensate for the loss of yield over the total four-year period. If phytopathological problems can be avoided, repeated undersowing of legumes seems to be more profitable than green manure each fourth year in stockless organic cereal production systems. The soil mineral N decreased during the study, demonstrating a negative N balance. Hence, additional N sources should be found for stockless organic cereal systems under Norwegian conditions.


EPrint Type:Conference paper, poster, etc.
Type of presentation:Paper
Keywords:biomass, clover, oats, ryegrass, soil mineral N, spring wheat
Subjects: Crop husbandry > Crop combinations and interactions
Research affiliation: Norway > Bioforsk - Norwegian Institute for Agriculture and Environmental Research
Norway > Bioforsk - Norwegian Institute for Agriculture and Environmental Research > Bioforsk Arable Crops Division
Norway > Bioforsk - Norwegian Institute for Agriculture and Environmental Research > Bioforsk Organic Food and Farming Division
International Conferences > 2007: 3rd QLIF Congress > 3 Crop production / soil management
Related Links:http://orgprints.org/10417/
Deposited By: Løes, Anne-Kristin
ID Code:9823
Deposited On:10 Apr 2007
Last Modified:12 Apr 2010 07:34
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted
Additional Publishing Information:The final version of this paper is published in:
Niggli, Urs; Leifert, Carlo; Alföldi, Thomas; Lück, Lorna and Willer, Helga, Eds. (2007) Improving Sustainability in Organic and Low Input Food Production Systems. Proceedings of the 3rd International Congress of the European Integrated Project Quality Low Input Food (QLIF). University of Hohenheim, Germany, March 20 – 23, 2007. Research Institute of Organic Agriculture FiBL, CH-Frick. http://orgprints.org/10417/
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