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Organic Agriculture

, Volume 5, Issue 1, pp 39–51 | Cite as

Weed suppressive ability in sole and intercrops of pea and oat and its interaction with ploughing depth and crop interference in organic farming

  • Annkathrin Gronle
  • Jürgen Heß
  • Herwart Böhm
Article

Abstract

The cultivation of weak weed competitive pea sole crops after reduced ploughing depth may result in weed problems in organic farming. Intercropping peas and cereals is one option to manage weed problems. However, little evidence exists on the weed suppressive ability of pea-cereal intercrops after differing ploughing depths. The effect of crop stand (pea sole crop, pea-oat intercrop and oat sole crop) and ploughing depth (10–12 vs. 25–27 cm) on the annual weed infestation, PAR transmission and weed nitrogen as well as water supply was investigated in field experiments in Northern Germany. In order to determine causes for the differing weed suppressive ability in pea and oat sole or intercrops, a pot experiment and a bioassay were conducted complementary to the field experiments. Crop stand and ploughing depth did not interact with regard to weed infestation. The weed suppressive ability increased from pea sole crops to oat sole crops, whereas shallow ploughing resulted in a significantly higher weed infestation than deep ploughing. While crop-weed competition for light was not essential for the differing weed suppressive ability, competition for water and nitrogen were detected to be key factors. As root exudates of the examined oat cultivar showed a growth inhibiting potential, allelopathy may also contribute to the weed suppression in oat sole and pea-oat intercrops. Results from this study indicate that pea-oat intercropping is not able to compensate for the higher annual weed infestation after shallow ploughing. Nevertheless, owing to their good weed suppressive ability, intercrops with cereals are of particular suitability for the cultivation of weak weed suppressive semi-leafless peas in reduced tilled soils in organic farming.

Keywords

Shallow ploughing Competition Allelopathy Pisum sativum Avena sativa 

Notes

Acknowledgments

This study was part of the project “Enhancing the economic value of organically produced cash crops by optimizing the management of soil fertility” funded by grants of the Federal Program for Organic and Sustainable Farming supported by the German Federal Ministry of Food and Agriculture. We thank B. Ivens-Haß and colleagues for their help in the field and the sample preparation. We also express gratitude to the Trenthorst Laboratory Unit for the chemical analysis and to Zobel-Stahlbau for providing the skim plough.

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Copyright information

© Springer Science+Business Media Dordrecht 2015

Authors and Affiliations

  • Annkathrin Gronle
    • 1
    • 2
  • Jürgen Heß
    • 2
  • Herwart Böhm
    • 1
  1. 1.Thünen Institute of Organic FarmingFederal Research Institute for Rural Areas, Forestry and FisheriesWesterauGermany
  2. 2.Organic Farming and Cropping SystemsUniversity of Kassel-WitzenhausenWitzenhausenGermany

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