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Resource efficient control of Elymus repens

Ringselle, Björn (2015). Resource efficient control of Elymus repens. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae, 1652-6880 ; 2015:36
ISBN 978-91-576-8270-3
eISBN 978-91-576-8271-0
[Doctoral thesis]

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Abstract

Elymus repens is a perennial grass weed that causes great yield losses in a variety of
crops in the southern and northern temperate zones. Primary control methods for E.
repens are herbicides or intensive tillage, both of which have a number of negative
side-effects, e.g. herbicides can contaminate groundwater, and tillage can cause
increased nitrogen leaching. The aim of this thesis was to investigate how to make non-
herbicide control of Elymus repens more resource efficient in terms of less energy
demanding soil cultivation and reduced nitrogen leaching. Three field experiments
were used to test cover crop competition, mowing and different types of optimised
tillage techniques and timing, as well as the combination of under-sown cover crops
and mowing or row hoeing. The growth, biomass allocation and morphological
responses of E. repens to competition were studied in a greenhouse experiment.

The effect of competition from under-sown cover crops on E. repens seems to
depend greatly on the cover crop biomass achieved. At high biomass levels, the cover
crop can be highly suppressive (Paper IV) and reduce nitrogen leaching (Paper III),
while at low levels they can still provide benefits such as reduced E. repens shoot
biomass and increased subsequent cereal yield (Paper I). However, a low-yielding red
clover cover crop increased E. repens rhizome production by 20-30%. Under-sown
cover crops were successfully combined with both mowing and row hoeing (Paper I &
III), but while repeated mowing reduced E. repens rhizome production by 35% it could
not be shown to give a competitive advantage to the cover crops over E. repens (Paper
I). However, the low nitrogen leaching and reduced downward transport of nitrogen
when mowing or row hoeing was combined with under-sown cover crops make them
interesting control methods for future research. Delaying tine cultivation by a few days
after harvest did not reduce E. repens control, but a delay by 20 days tended to result in
higher E. repens rhizome biomass and shoot densities, compared to performing it
within a few days of harvest. Repeated tine cultivation did not improve control of E.
repens or increase subsequent cereal yield, compared to a single cultivation directly
after harvest. Repeated cultivation during autumn should therefore not be used
categorically, but only when there is reason to believe the shoots will pass the
compensation point due to the autumn conditions. We conclude that a site specific
approach is necessary to achieve resource efficient control of E. repens.

Authors/Creators:Ringselle, Björn
Title:Resource efficient control of Elymus repens
Series/Journal:Acta Universitatis agriculturae Sueciae (1652-6880)
Year of publishing :2015
Depositing date:27 April 2015
Volume:2015:36
Number of Pages:35
Papers/manuscripts:
NumberReferences
IB Ringselle, G Bergkvist, H Aronsson & L Andersson (2015). Under-sown cover crops and post-harvest mowing as measures to control Elymus repens. Weed Research In press
IIB Ringselle, G Bergkvist, H Aronsson & L Andersson. Importance of timing and repetition of stubble cultivation for post-harvest control of Elymus repens (submitted manuscript)
IIIH Aronsson, B Ringselle, L Andersson & G Bergkvist. Combining mechanical control of couch grass (Elymus repens L.) with reduced tillage and cover crops to decrease N and P leaching (submitted manuscript)
IVB Ringselle, L Andersson, H Aronsson, I Ruiz & G Bergkvist. Biomass allocation in Elymus repens as affected by competition from perennial ryegrass and red clover (manuscript)
Place of Publication:Uppsala
Publisher:Department of Crop Production Ecology, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-576-8270-3
ISBN for electronic version:978-91-576-8271-0
ISSN:1652-6880
Language:English
Additional Information:The experiments in this thesis received financial support from the Swedish Farmers’ Foundation for Agricultural Research and from the SLU Ekoforsk research programme at the Swedish University of Agricultural Sciences.
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:F Plant production > F07 Soil cultivation
F Plant production > F40 Plant ecology
F Plant production > F62 Plant physiology - Growth and development
H Protection of plants and stored products > H60 Weeds and weed control
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Agricultural Science
Agrovoc terms:elymus repens, perennial weeds, mechanical control, mowing, tillage, plant competition, cover plants, nitrogen, leaching, organic farming
Keywords:Elytrigia repens, Agropyron repens, mowing, mechanical control, perennial weeds, organic farming, nitrogen leaching, competition, cover crops, soil tillage
URN:NBN:urn:nbn:se:slu:epsilon-e-2599
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-2599
ID Code:12150
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Crop Production Ecology
External funders:Stiftelsen Lantbruksforskning
Deposited By: Björn Ringselle
Deposited On:29 Apr 2015 03:31
Metadata Last Modified:06 Feb 2016 23:08

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