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Survival of downy brome (Bromus tectorum) seed in four environments

Published online by Cambridge University Press:  12 June 2017

Gail A. Wicks
Gail A. Wicks*
Affiliation:
Department of Agronomy, University of Nebraska, North Platte, NE 69101
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Abstract

Downy brome is one of the most troublesome winter annual weeds in winter wheat-fallow rotations in the central Great Plains. A 3-yr seed burial study was initiated to determine how long downy brome seed remained germinable when placed on the soil surface or 2.5 cm deep at four different times in four environments. Only 1 to 7% of the downy brome seed survived after 1 yr on the soil surface in chemical fallow and stubble mulch when deposited in August, but survival varied in September, October, and November. In 1970, a year with low fall and winter precipitation, 36 to 46% of the seed placed on the soil surface of chemical fallow in September, October, and November survived, compared with 1 to 8% for stubble mulch tillage. Early spring tillage covered more seed with soil, and downy brome seed survival decreased. When fall and winter precipitation was normal, stubble mulch and chemical fallow had 1 to 20% germinable seed remaining. Induced dormancy existed in some years. More downy brome seed survived when placed on the soil surface of crested wheatgrass sod (14 to 50%) than on smooth brome sod (0 to 36%). No differences existed among environments when downy brome seed was buried 2.5 cm deep. Only 0.4% of downy brome seed buried 2.5 cm survived after 1 yr when averaged across all environments.

Keywords

Downy brome, Bromus tectorum L. BROTEcrested wheatgrass, Agropyron desertorum Fisch. Schultsmooth brome, Bromus inermis L. ‘Lincoln’winter wheat, Triticum aestivum L.Chemical fallowecofallowstubble mulchBROTE
Type
Weed Biology and Ecology
Information
Weed Science , Volume 45 , Issue 2 , April 1997 , pp. 225 - 228
Copyright
Copyright © 1997 by the Weed Science Society of America 

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References

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