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Growth and development of spring crops in competition with oat in the dryland Mediterranean climate of eastern Washington

Published online by Cambridge University Press:  13 July 2020

Misha R. Manuchehri*
Affiliation:
Assistant Professor, Department of Plant and Soil Sciences, Oklahoma State University, Stillwater, OK, USA
E. Pat Fuerst
Affiliation:
Assistant Research Professor, Department of Crop and Soil Sciences, Washington State University, Pullman, WA, USA
Stephen O. Guy
Affiliation:
Professor, Department of Crop and Soil Sciences, Washington State University, Pullman, WA, USA
Bahman Shafii
Affiliation:
Professor and Director of Statistical Programs, College of Agricultural and Life Sciences, University of Idaho, Moscow, ID, USA
Dennis L. Pittmann
Affiliation:
Research Technologist III, Department of Crop and Soil Sciences, Washington State University, Pullman, WA, USA
Ian C. Burke
Affiliation:
Professor, Department of Crop and Soil Sciences, Washington State University, Pullman, WA, USA
*
Author for correspondence: Misha R. Manuchehri, Department of Plant and Soil Sciences, Oklahoma State University, 371 Agricultural Hall, Stillwater, OK74078. (Email: misha.manuchehri@okstate.edu)

Abstract

Weed management during spring crop production in eastern Washington presents many challenges. Many spring crops are weak competitors with weeds. In May of 2010 and 2011, two spring crop trials were initiated near Pullman, WA, to compare the relative competitiveness of barley (Hordeum vulgare L.), wheat (Triticum aestivum L.), lentil (Lens culinaris Medik.), and pea (Pisum sativum L.) using cultivated oat (Avena sativa L.) as a surrogate for wild oat (Avena fatua L.) competition. The experiment was arranged as a split-block split-plot design with four replications. One set of main plots included three oat density treatments (0, 63, and 127 plants m−2), while a second set included each crop species. Crop species main plots were then split into subplots of two different seeding rates (recommended and doubled). Crop populations decreased as oat density increased and increased as crop seeding rate increased. As oat density increased, preharvest crop biomass decreased for all crops, while oat biomass and yield increased. Oat biomass and yield were greater in legume plots compared with cereal plots. Increasing oat density decreased yields for all crops, whereas doubling crop seeding rate increased yields for barley and wheat in 2010 and barley in 2011. Compared with legumes, cereals were taller, produced more biomass, and were more competitive with oat.

Type
Research Article
Copyright
© The Author(s), 2020. Published by Cambridge University Press on behalf of Weed Science Society of America

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Footnotes

Associate Editor: Prashant Jha, Iowa State University

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