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Mineralization of lupine seed meal and seedlings used as N fertilizer in organic vegetable production

Katroschan, K. and Stützel, H. (2008) Mineralization of lupine seed meal and seedlings used as N fertilizer in organic vegetable production. Poster at: Cultivating the Future Based on Science: 2nd Conference of the International Society of Organic Agriculture Research ISOFAR, Modena, Italy, June 18-20, 2008.

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Summary

Seeds of grain legumes are currently discussed as N fertilizer in organic vegetable production. They can be produced by the farmers themselves and applied in well controlled amounts flexibly in time and space. Most research investigating the N mineralization of grain legume seeds was carried out using coarsely milled seeds. We hypothesized that seed germination alters the chemical composition leading to a higher N release compared to seed meal. In a pot experiment the C:N ratio of lupine seeds was shown to decrease noticeably within the first two weeks after sowing. After an incubation period of 1300°Cd net N mineralization was significantly higher for the lupine seedlings compared to the seed meal and close relationships between N mineralization and C:N ratio were found. In field experiments with white cabbage, carried out in 2005 and 2006, similar relationships were found but sowing followed by an early incorporation of seedlings after 12 and 13 days showed an N supply similar to the seed meal treatment only. Strong priming effects, mainly caused by the lupine seed meal, are discussed to be a possible reason. Late incorporation after 42 and 37 days resulted in significantly lower N supply and cabbage yield.


EPrint Type:Conference paper, poster, etc.
Type of presentation:Poster
Keywords:C:N lupine seedlings lupine seed meal N mineralization organic fertilizer
Subjects: Soil > Nutrient turnover
Crop husbandry > Composting and manuring
Research affiliation: International Conferences > 2008: IFOAM OWC: Research Track / ISOFAR > 2.4 Vegetable production
Deposited By: Katroschan, Kai-Uwe
ID Code:12677
Deposited On:30 Sep 2008
Last Modified:03 Nov 2010 09:54
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted
Additional Publishing Information:This paper is published in the conference proceedings:
Neuhoff, Daniel; Halberg, Niels; Alfldi, Thomas; Lockeretz, William; Thommen, Andreas; Rasmussen, Ilse A.; Hermansen, John; Vaarst, Mette; Lck, Lorna; Carporali, Fabio; Jensen, Henning Hgh; Migliorini, Paola and Willer, Helga, Eds. (2008) .Cultivating the Future Based on Science. Proceedings of the Second Scientific Conference of the International Society of Organic Agriculture Research (ISOFAR), held at the 16th IFOAM Organic World Congress in Cooperation with the International Federation of Organic Agriculture Movements (IFOAM) and the Consorzio ModenaBio, 18 . 20 June 2008 in Modena, Italy.. International Society of Organic Agriculture Research (ISOFAR), c/o IOL, DE-Bonn, Research Institute of Organic Agriculture FiBL, CH-Frick. http://orgprints.org/13672 and http://orgprints.org/13674

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