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Pre-harvest Glyphosate Staging Guide for Canola

By applying pre-harvest glyphosate at 50-60% seed colour change in the least mature areas of the field, including any areas of regrowth with seed production, growers can be confident grain moisture will be <30%. At this stage, seeds in the main stem will be:

  • Top = green, firm to roll
  • Middle = mostly brown, with some speckling
  • Bottom = completely brown/black
  • Where allowed, glyphosate is registered for pre-harvest weed control and is not to be used as a desiccant
  • Pre-harvest glyphosate may only be applied when grain moisture content is less than 30% in the least mature part of the field, including any areas of regrowth which may produce seed. Applying too early can result in unacceptable product residues in the grain.
  • To avoid unacceptable residue levels, always follow the product’s label for application rate, timing and pre-harvest interval (PHI).
  • Never harvest earlier than recommended – this can increase the risk of unacceptable glyphosate residues in harvested grain.
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In this episode, Lyle Cowell is joined by Dr. Erin Daly from the University of Guelph to break down denitrification and the conditions that drive nitrogen loss in the soil. They explore how nitrogen can be lost as nitrous oxide and nitrogen gas, what conditions drive losses and when they are most likely to occur.

Erin also shares how CanN2ONet, a national research network, is helping us better understand nitrous oxide emissions across Canada. From field towers that measure emissions to research into regionally tailored best management practices, discover how the network is working to help growers improve nitrogen use efficiency and help reduce nitrogen losses across the country.