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Yield loss in spring-sown cereals related to the weed flora in the spring

Published online by Cambridge University Press:  20 January 2017

Ullalena Boström ,
Per Milberg  and
Håkan Fogelfors
Per Milberg
Affiliation:
Department of Biology—IFM, Linköping University, SE-581 83 Linköping, Sweden
Håkan Fogelfors
Affiliation:
Department of Ecology and Crop Production Science, SLU, Box 7043, SE-750 07 Uppsala, Sweden
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Abstract

Yield loss was related to weed species composition and density in permanent plots, recorded several weeks after sowing of spring cereals in southern Sweden. A range of agronomic situations was included by experimentally varying fertilizer application and sowing density in 33 field trials in different locations during 3 yr. Direct gradient analysis, using yield loss as the sole predictor, arranged weed community composition in the spring along a gradient of small to large yield losses. Yield loss could be explained, to some extent, by the species composition in the spring. Species associated with situations with large losses were hempnettle and wild radish, whereas several benign species were identified based on their association with lack of yield loss. The results suggest that possible predictive tools using spring species composition would be improved if they also considered soil type and seed rate. Some agronomically important weed species were not identified as associated with yield loss when assessed in terms of their abundance in the spring, which may limit the possibilities of basing management decisions on weed plant density in the spring.

Keywords

Hempnettle, Galeopsis spp.wild radish, Raphanus raphanistrum L. RAPRAnightflowering catchfly, Silene noctiflora L. MELNOscarlet pimpernel, Anagallis arvensis L. ANGARspurge species; Euphorbia spp.Polygonum spp.prostrate knotweed, Polygonum aviculare L. POLAVwild buckwheat, Polygonum convolvulus L. POLCOcommon lambsquarters, Chenopodium album L. CHEALfield violet, Viola arvensis Murr. VIOARspring barley, Hordeum distichum L.spring wheat, Triticum aestivum L.Multivariate analysispredictionredundancy analysisseedlingSweden
Type
Research Article
Information
Weed Science , Volume 51 , Issue 3 , June 2003 , pp. 418 - 424
Copyright
Copyright © Weed Science Society of America 

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