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Germination of Winter Annual Grass Weeds under a Range of Temperatures and Water Potentials

Published online by Cambridge University Press:  08 May 2017

Ananda Scherner ,
Bo Melander ,
Peter K. Jensen ,
Per Kudsk  and
Luis A. Avila
Ananda Scherner
Affiliation:
Ph.D Student, Associate Professor, Senior Researcher, and Professor, Department of Agroecology, Aarhus University, Forsøgsvej 1, DK-4200 Slagelse, Denmark
Bo Melander*
Affiliation:
Ph.D Student, Associate Professor, Senior Researcher, and Professor, Department of Agroecology, Aarhus University, Forsøgsvej 1, DK-4200 Slagelse, Denmark
Peter K. Jensen
Affiliation:
Ph.D Student, Associate Professor, Senior Researcher, and Professor, Department of Agroecology, Aarhus University, Forsøgsvej 1, DK-4200 Slagelse, Denmark
Per Kudsk
Affiliation:
Ph.D Student, Associate Professor, Senior Researcher, and Professor, Department of Agroecology, Aarhus University, Forsøgsvej 1, DK-4200 Slagelse, Denmark
Luis A. Avila
Affiliation:
Associate Professor, Department of Crop Protection, Federal University of Pelotas, Pelotas, RS, Brazil
*
*Corresponding author’s E-mail: bo.melander@agro.au.dk
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Abstract

Silky windgrass and annual bluegrass are among the most troublesome weeds in northern European winter crops, while problems with rattail fescue have been especially linked to direct-drilling practices. This study investigated the germination patterns of silky windgrass, annual bluegrass, and rattail fescue in multiple water potentials and temperature regimes. Temperature and water potential effects were similar between silky windgrass and rattail fescue, but differed from annual bluegrass. The three grass weeds were able to germinate under low water potential (−1.0 MPa), although water potentials ≤−0.25 MPa strongly delayed their germination. Silky windgrass and rattail fescue seeds were able to germinate at 1 C, while the minimum temperature for annual bluegrass germination was 5 C. Germination of silky windgrass and rattail fescue was very similar across temperature and water potentials, which implies similar emergence flushes under field conditions, allowing management interventions to follow the same scheme.

Keywords

Annual bluegrass, Poa annua L. POAANrattail fescue, Vulpia myuros (L.) K. C. Gmel. VLPMYsilky windgrass, Apera spica-venti L. APESV.Base temperaturebase water potentialgermination rateweed biology

Information

Type
Weed Biology and Ecology
Information
Weed Science , Volume 65 , Issue 4 , July 2017 , pp. 468 - 478
Copyright
© Weed Science Society of America, 2017 

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Footnotes

Associate Editor for this paper: J. Anita Dille, Kansas State University.

References

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