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Fall-applied residual herbicides improve broadleaf weed management in ultra-early wheat

Ultra-early spring wheat (Triticum aestivum L.) planting systems based on soil temperature on the northern Great Plains have lower overall variability in grain yield, and can increase grain yield relative to current calendar date-based spring wheat planting systems used in the region. However, ultra...

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Published in:Canadian journal of plant science 2022-12, Vol.102 (6), p.1115
Main Authors: Collier, Graham R.S, Spaner, Dean M, Hall, Linda M, Graf, Robert J, Beres, Brian L
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Language:English
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Spaner, Dean M
Hall, Linda M
Graf, Robert J
Beres, Brian L
description Ultra-early spring wheat (Triticum aestivum L.) planting systems based on soil temperature on the northern Great Plains have lower overall variability in grain yield, and can increase grain yield relative to current calendar date-based spring wheat planting systems used in the region. However, ultra-early planting when soils are cold (2 [degrees]C), and resulting early crop emergence, precludes most foliar pre-seeding weed control options. Field trials were conducted at three sites in western Canada from 2017 to 2019 to evaluate the crop safety, broadleaf weed efficacy, and growing system stability resulting from the inclusion of fall applications of soil-applied residual herbicides prior to planting wheat ultra-early the following spring. Flumioxazin (protoporphyrinogen oxidase inhibitor; Weed Science Society of America (WSSA) group 14) and pyroxasulfone (very long chain fatty acid synthesis inhibitor; WSSA group 15) were applied alone and in combination at multiple rates in the late fall prior to ground freeze. The following spring, hexaploid spring wheat was planted ultra-early, based on a soil temperature trigger of 2 [degrees]C, and later, triggered by a soil temperature of 8 [degrees]C. When planting was completed ultra-early, grain yield was greater, and variability of grain yield was lower. Herbicide treatments increased broadleaf weed control, and in some environments further increased grain yield and reduced grain yield variability without resulting in phytotoxicity. The ability to safely incorporate fall-applied residual herbicides into ultra-early spring wheat planting systems provides an option for growers to adopt ultra-early planting without negatively impacting weed management on their farms.
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subjects Crop yields
Fatty acids
Herbicides
Oxidases
Synthesis
Technology application
Wheat industry
title Fall-applied residual herbicides improve broadleaf weed management in ultra-early wheat
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