Abstract
Field studies were conducted in Wyoming and Nebraska in 2007 through 2009 to evaluate winter wheat response to aminocyclopyrachlor. Aminocyclopyrachlor was applied at rates between 15 and 120 g ai ha−1 6, 4, and 2 mo before winter wheat planting (MBP). Redroot pigweed control was 90% with aminocyclopyrachlor rates of 111 and 50 g ha−1 when applied 4 or 2 MBP. Aminocyclopyrachlor at 37 g ha−1 controlled Russian thistle 90% when applied 6 MBP. At Sidney, NE, winter wheat yield loss was > 10% at all aminocyclopyrachlor rates when applied 2 or 4 MBP, and at all rates > 15 g ha−1 when applied 6 MBP. At Lingle, WY, > 40% winter wheat yield loss was observed at all rates when averaged over application timings. Although the maturing wheat plants looked normal, few seed were produced in the aminocyclopyrachlor treatments, and therefore preharvest wheat injury ratings of only 5% corresponded to yield losses ranging from 23 to 90%, depending on location. The high potential for winter wheat crop injury will almost certainly preclude the use of aminocyclopyrachlor in the fallow period immediately preceding winter wheat.
Highlights
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A general trend for declining summer fallow hectares has been observed in the United States since 1970; this practice is still utilized on approximately 6 million hectares (USDA-ERS 2007)
Weed control during the fallow period is of utmost importance to prevent water usage by weeds because in most years winter wheat yield is highly correlated with the amount of water in the soil profile at the time of planting (Nielsen et al 2002)
Summary
Authors: Kniss, Andrew R., and Lyon, Drew J. BioOne Complete (complete.BioOne.org) is a full-text database of 200 subscribed and open-access titles in the biological, ecological, and environmental sciences published by nonprofit societies, associations, museums, institutions, and presses. Your use of this PDF, the BioOne Complete website, and all posted and associated content indicates your acceptance of BioOne’s Terms of Use, available at www.bioone.org/terms-of-use. Weed control during the fallow period is of utmost importance to prevent water usage by weeds because in most years winter wheat yield is highly correlated with the amount of water in the soil profile at the time of planting (Nielsen et al 2002). Aminocyclopyrachlor has a reported half-life of 72 to 128 d in bare ground field soils
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