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

Gronle, Annkathrin; Heß, Jürgen and Böhm, Herwart (2015) Weed suppressive ability in sole and intercrops of pea and oat and its interaction with ploughing depth and crop interference in organic farming. Organic Agriculture, 5 (1), pp. 39-51.

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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 cropweed 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.

EPrint Type:Journal paper
Keywords:Shallow ploughing, Competition, Allelopathy, Pisum sativum, Avena sativa, BÖLN, BOELN, BÖL, BOEL, FKZ 08OE009
Subjects: Crop husbandry > Crop combinations and interactions
Crop husbandry > Production systems > Cereals, pulses and oilseeds
Crop husbandry > Soil tillage
Crop husbandry > Weed management
Research affiliation: Germany > Federal Organic Farming Scheme - BOELN > Plants > Pflanzenbau
Germany > Federal Research Institute for Rural Areas, Forestry and Fisheries - VTI > Institute of Organic Farming - OEL
Germany > University of Kassel > Department of Organic Farming and Cropping
ISSN:1879-4238 (Print), 1879-4246 (Online)
DOI:DOI 10.1007/s13165-014-0095-x
Related Links:http://www.bundesprogramm-oekolandbau.de, https://orgprints.org/cgi/search/advanced?addtitle%2Ftitle=&keywords=08OE009&projects=BOEL&_order=bypublication&_action_search=Suchen
Deposited By: Böhm, Dr. Herwart
ID Code:29318
Deposited On:28 Sep 2015 09:00
Last Modified:14 Jul 2020 08:26
Document Language:English
Refereed:Peer-reviewed and accepted

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