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1 October 2016 Potential Corn Yield Losses from Weeds in North America
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Crop losses from weed interference have a significant effect on net returns for producers. Herein, potential corn yield loss because of weed interference across the primary corn-producing regions of the United States and Canada are documented. Yield-loss estimates were determined from comparative, quantitative observations of corn yields between nontreated and treatments providing greater than 95% weed control in studies conducted from 2007 to 2013. Researchers from each state and province provided data from replicated, small-plot studies from at least 3 and up to 10 individual comparisons per year, which were then averaged within a year, and then averaged over the seven years. The resulting percent yield-loss values were used to determine potential total corn yield loss in t ha−1 and bu acre−1 based on average corn yield for each state or province, as well as corn commodity price for each year as summarized by USDA-NASS (2014) and Statistics Canada (2015). Averaged across the seven years, weed interference in corn in the United States and Canada caused an average of 50% yield loss, which equates to a loss of 148 million tonnes of corn valued at over U.S.$26.7 billion annually.

Nomenclature: Corn, Zea mays L.

Nader Soltani, J. Anita Dille, Ian C. Burke, Wesley J. Everman, Mark J. VanGessel, Vince M. Davis, and Peter H. Sikkema "Potential Corn Yield Losses from Weeds in North America," Weed Technology 30(4), 979-984, (1 October 2016).
Received: 28 March 2016; Accepted: 1 May 2016; Published: 1 October 2016

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