• Soybeans
• Herbicide Resistance
• Seeding
• University of Saskatchewan

Objective

To determine the effectiveness of seeding date and seeding rate in managing glyphosate resistant canola volunteers in glyphosate resistant soybean crops. To provide herbicide options for soybean growers to manage glyphosate resistant canola volunteers in glyphosate resistant soybean crops.

Outcome

Response to seeding date was variable and was environment dependent, however, increasing seeding rates generally resulted in reduced canola interference and higher soybean yield. Based on an economic analysis, the optimal seeding rate was 40 plants per metre squared in years with low or average market prices and 50-60 plants per metre squared with high market prices. Most of the POST- herbicides evaluated provided acceptable control of volunteer canola and resulted in increases in soybean biomass and yield more than 40% of the time.

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