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

Jeffrey A. Koscelny and Thomas F. Peeper
Weed Science
Vol. 38, No. 6 (Nov., 1990), pp. 532-535
Stable URL: http://www.jstor.org/stable/4045069
Page Count: 4
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Herbicide-Grazing Interactions in Cheat (Bromus secalinus)-Infested Winter Wheat (Triticum aestivum)
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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.

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