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Herbicide-Grazing Interactions in Cheat (Bromus secalinus)–Infested Winter Wheat (Triticum aestivum)1

Published online by Cambridge University Press:  12 June 2017

Jeffrey A. Koscelny  and
Thomas F. Peeper
Jeffrey A. Koscelny
Affiliation:
Dep. Agron., Oklahoma State Univ., Stillwater, OK 74078
Thomas F. Peeper
Affiliation:
Dep. Agron., Oklahoma State Univ., Stillwater, OK 74078
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Abstract

Field experiments were conducted to determine the interaction of grazing and herbicide treatments on cheat control and biomass, wheat biomass, wheat grain yield, and wheat yield components. Ethyl-metribuzin at 1120 g ai ha−1 and metribuzin at 420 g ai ha−1 reduced cheat biomass 91 to 99 and 97 to 98%, respectively. Grazing had no effect on herbicide efficacy. Grazing increased cheat biomass in the check by 24% at only one location but did not affect total wheat plus cheat biomass. With one exception, controlled cheat was replaced by wheat on a 1:1 biomass basis when herbicides caused no crop injury. All herbicide treatments increased grain yield, but grazing did not alter yield. At two locations, increased heads m−2 and spikelets/head accounted for most of the grain yield increases, but at one location seeds/spikelet and weight/seed were also increased. Harvest index was unaffected.

Keywords

Ethyl-metribuzin (BAY SMY 1500), 4-amino-6-(1,1-dimethylethyl)-3-(ethylthio)-1,2,4-triazin-5(4H)-onemetribuzin, 4-amino-6-(1,1-dimethylethyl) - 3 - (methylthio) - 1,2,4-triazin-5(4H)-onecheat, Bromus secalinus L. # BROSEwinter wheat, Triticum aestivum L., ‘TAM 105’Grazingharvest indexyield componentsBROSE
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 38 , Issue 6 , November 1990 , pp. 532 - 535
Copyright
Copyright © 1990 by the Weed Science Society of America 

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References

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