Abstract
Urea ammonium nitrogen can be used as a carrier for herbicides to provide growers with an option for the control of broadleaf weeds and spraying nitrogen fertilizer in one pass in winter wheat. Field studies (six in total) were seeded in the autumn of 2005, 2006 and 2007 at Exeter and Ridgetown, Ontario, Canada to determine if UAN can be used as a carrier for bromoxynil/MCPA, dichlorprop/2,4-D, dicamba/MCPA/mecoprop, or thifensulfuron/tribenuron applied postemergence (POST) at three application timings (approximately April 20, May 1 and May 10) in winter wheat. Winter wheat injury was as much as 4%, 5%, 4% and 5% for bromoxynil/MCPA, dichloroprop/2,4-D, dicamba/MCPA/ mecoprop or thifensulfuron/tribenuron, respectively. There was minimal visible winter wheat injury with treatments evaluated at 4 and 9 week after treatment. There was no significant reduction in winter wheat height or yield with herbicides evaluated at various application timings except for dicamba/MCPA/mecoprop treatment which reduced height 3% and yield 25% at May 10 compared with April 20 application timing. Herbicides carrier had no effect on winter wheat height or yield with evaluated herbicides. Based on this research there is potential for co-application of UAN and bromoxynil/MCPA, dichlorprop/2,4-D, dicamba/MCPA/mecoprop, or thifensulfuron/tribenuron applied (POST) early in the spring in winter wheat.
Highlights
Winter wheat (Triticum aestivum L.) is important to the agriculture in Ontario where it ranks as the fourth largest field crop grown in the province after maize (Zea mays L.), soybean (Glycine max L.) and alfalfa (Medicago sativa L.) [1]
There was no significant reduction in winter wheat height or yield with herbicides evaluated at various application timings except for dicamba/MCPA/mecoprop treatment which reduced height 3% and yield 25% at May 10 compared with April 20 application timing
Based on this research there is potential for co-application of urea-ammonium nitrate solution (UAN) and bromoxynil/MCPA, dichlorprop/2,4-D, dicamba/MCPA/mecoprop, or thifensulfuron/tribenuron applied (POST) early in the spring in winter wheat
Summary
Winter wheat (Triticum aestivum L.) is important to the agriculture in Ontario where it ranks as the fourth largest field crop grown in the province after maize (Zea mays L.), soybean (Glycine max L.) and alfalfa (Medicago sativa L.) [1]. In 2010, winter wheat growers planted nearly 443,000 hectares and produced 2,207,000 MT of winter wheat with a farm gate value of more than $300,000,000 [2]. Ontario growers like to include winter wheat in their crop rotation as this crop is seeded in narrow rows in the autumn allowing it to suppress weed growth. Winter cereals play an important role in the protection of light soils against water and wind erosion as their establishment in the autumn helps to anchor the soil during the winter and spring seasons [3].
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