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Timing of Nitrogen Application Affects Downy Brome (Bromus tectorum) Growth in Winter Wheat

Published online by Cambridge University Press:  12 June 2017

Randy L. Anderson
Randy L. Anderson*
Affiliation:
Agric. Res. Serv., U.S. Dep. Agric., Akron, CO 80720
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Abstract

Field studies were conducted to determine if varying the time N fertilizer was applied would affect downy brome interference in winter wheat. Five treatments were compared: four broadcast application times of NH4NO3 at 56 kg N ha-1 during the fallow-crop cycle: 1) during fallow; 2) at planting; 3) during crop dormancy; 4) before winter wheat jointing; and 5) a control where no N was applied. Downy brome was least responsive to N applied during fallow. All N applications during the growing season of winter wheat increased downy brome biomass and culms m-2. Downy brome interference prevented winter wheat from responding positively to N. For example, when crop season precipitation was only 70% of normal, applying N reduced grain yield of winter wheat infested with downy brome from 12 to 28%. This study indicates that N manipulation offers potential for reducing downy brome interference in winter wheat.

Keywords

Winter wheat, Triticum aestivum L. ‘Sandy’downy brome, Bromus tectorum L. ♯ BROTEYield componentsprecipitation effectcommunity yieldBROTE
Type
Research
Information
Weed Technology , Volume 5 , Issue 3 , September 1991 , pp. 582 - 585
Copyright
Copyright © 1991 Weed Science Society of America 

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