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Rapsanbau im ökologischen Landbau – Auswirkungen von Vorfrucht, Reihen-abstand und Untersaat mit Weißklee auf den Ertrag

Böhm, Herwart (2007) Rapsanbau im ökologischen Landbau – Auswirkungen von Vorfrucht, Reihen-abstand und Untersaat mit Weißklee auf den Ertrag. [Oil seed rape cultivation in organic farming – Effect of preceding crop, row distance and undersown white clover on yield.] Paper at: Zwischen Tradition und Globalisierung - 9. Wissenschaftstagung Ökologischer Landbau, Universität Hohenheim, Stuttgart, Deutschland, 20.-23.03.2007.

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Summary

The demand for organically cultivated oil seed rape in Germany is very high. But the risk of cultivation due to the high demand of N-supply, preceding crop, weed manage¬ment and plant protection is very high as well. In a two-year experiment, the effects of (I) preceding crop (ryegrass-clover-mixture: (a) cut mowing vs. (b) mulching, (c) peas and (d) barley-pea-mixture), (II) row distance of oil seed rape (12.5 cm, 25 cm, 37.5 and 50 cm) and (III) underseed in autumn together with the oil seed rape (with and without white clover) were tested in a split-plot-design with four replicates at the ex-perimental farm of the Institute of Organic Farming (FAL) in Trenthorst. The results showed a very different yield level with 0.85 t ha-1 in 2004, and 1.68 t ha-1 in 2005, which is a result of a high pressure due to blossom rape beetles (Meligethes aeneus) in 2004. The highest yield of oil seed rape was realized after the mulched ryegrass-clover-mixture with 1.29 t ha-1 in 2004 and 2.48 t ha-1 in 2005, but only in 2005 it was significantly different to the cut mowing system. In both years yield was significantly higher after ryegrass-clover compared to pea or barley-pea-mixture. In comparison of the different row distances, yield was significantly lower at the row distance of 12.5 cm. The undersown white clover decreased the yield with the exception of the 12.5 cm plots. This effect is caused by the weed control done with a mechanical hoe in the plots without the undersown clover combined with the wider row distances. So in these plots the heavy clay soil were aerated, which stimulated the N-mineralisation during the time of high N-demand by the oil seed rape in early springtime.


EPrint Type:Conference paper, poster, etc.
Type of presentation:Paper
Keywords:Pflanzenbau, Pflanzenernährung, Raps
Subjects: Crop husbandry > Production systems > Cereals, pulses and oilseeds
Crop husbandry > Crop combinations and interactions
Research affiliation: Germany > Federal Research Institute for Rural Areas, Forestry and Fisheries - VTI > Institute of Organic Farming - OEL
International Conferences > 2007: Scientific Conference on Organic Agriculture > 1 Plant and Soil > 1.1 Crop production and soil tillage
Deposited By: Böhm, Dr. Herwart
ID Code:9688
Deposited On:14 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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