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Seedling Emergence of Winter Annual Grasses as Affected by Limited Tillage and Crop Canopy

Published online by Cambridge University Press:  12 June 2017

R. L. Anderson
R. L. Anderson*
Affiliation:
Central Great Plains Research Station, Akron, CO 80720
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Abstract

Jointed goatgrass and downy brome continue to plague winter wheat producers in the western United States. Because there are no effective herbicides for in-crop control of these weeds, producers are seeking cultural practices that stimulate seed germination and deplete the soil seed bank. We determined the effect of limited tillage and crop canopy on seedling emergence of these grasses. One tillage operation with a sweep plow increased jointed goatgrass seedling emergence 74% in the first year but did not affect emergence in later years. Downy brome emergence was not affected by tillage. Jointed goatgrass seedlings emerged over 5 yr, whereas downy brome did not emerge after 3 yr. Seedling emergence of both species was two times greater in corn and barley than in proso millet. Producers will accrue more benefit for seedbank management with cultural strategies such as alternative rotations and competitive wheat canopies than with limited tillage using a sweep plow.

Keywords

Downy brome, Bromus tectorum L. #3 BROTEjointed goatgrass, Aegilops cylindrica Host # AEGCYbarley, Hordeum vulgare L.corn, Zea mays L.proso millet, Panicum miliaceum L.winter wheat, Triticum aestivum L.Rotationseedbank depletionseed survival
Type
Research
Information
Weed Technology , Volume 12 , Issue 2 , June 1998 , pp. 262 - 267
Copyright
Copyright © 1998 by the Weed Science Society of America 

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