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N-Bedarf und N-Effizienz von Mischfruchtanbausystemen mit Ölpflanzen im ökologischen Landbau

Paulsen, Hans Marten; Schochow, Martin and Behrendt, Andrea (2007) N-Bedarf und N-Effizienz von Mischfruchtanbausystemen mit Ölpflanzen im ökologischen Landbau. [N-demand and N-efficiency of mixed cropping systems with oil crops in organic farming.] Paper at: Zwischen Tradition und Globalisierung - 9. Wissenschaftstagung Ökologischer Landbau, Universität Hohenheim, Stuttgart, Deutschland, 20.-23.03.2007.

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Summary

Mixed cropping systems with oil crops are of growing interest in organic farming. They can offer agricultural advances like competition against weeds, support against lodg¬ing and buffering of yield fluctuations. The aim of the cultivation method is to gain additional oil yields for energy or feed purposes. The reported higher land-efficiency-ratios of those mixed cropping systems should lead to higher nutrient requirements. But it is unknown if the different crops just compete for rare soil nutrients or if comple¬mentary effects in mixed cropping systems lead to higher nutrient efficiency. In a field study N-contents in plants and N uptake of diverse mixed cropping systems were compared to sole cropping systems. In linseed (Linum usitatissivum) or false flax (Camelina sativa) in combination with spring wheat (Triticum aestivum) the oil crops showed lower N contents during stem elongation. The N concentrations in wheat tissue were not affected by competition. Wheat was dominating the mixtures. In mix-tures of peas (Pisum sativum) with false flax elevated N concentra¬tions in plant tissue of both component crops were determined. In non-leguminous mixtures with RYT >1 (spring wheat x false flax), N uptake exceeded the N-require¬ment of the sole crops. In mixtures of legumes with oil crops with RYT >1 (peas x false flax), the N-uptake of the mixtures was equivalent to or exceeded the N uptake of sole-cropped oil crops.


EPrint Type:Conference paper, poster, etc.
Type of presentation:Paper
Keywords:Betriebssysteme, Pflanzenernährung, Bodenfruchtbarkeit
Subjects: Soil > Nutrient turnover
Crop husbandry > Crop combinations and interactions
Research affiliation: International Conferences > 2007: Scientific Conference on Organic Agriculture > 1 Plant and Soil > 1.5 Plant nutrition, soil fertility, fertilizers, farm yard manure
Deposited By: Paulsen, Dr. Hans Marten
ID Code:9412
Deposited On:11 May 2007
Last Modified:12 Apr 2010 07:34
Document Language:German - Deutsch
Status:Published
Refereed:Peer-reviewed and accepted
Additional Publishing Information:Die endgültige Version des Beitrags ist veröffentlicht in:
S. Zikeli, W. Claupein, S. Dabbert, B. Kaufmann, T. Müller und A. Valle Zárate, Hrsg. (2007)
Zwischen Tradition und Globalisierung – 9. Wissenschaftstagung Ökologischer Landbau, Universität Hohenheim, Deutschland, 20.-23. März 2007, http://orgprints.org/10742/

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