Input Study and Recovery

Researcher: K. Neil Harker, John O’Donovan, Kelly Turkington, Agriculture and Agri-Food Canada (AAFC), Lacombe AB, Robert Blackshaw, Newton Lupwayi, AAFC Lethbridge, AB, Eric Johnson, AAFC Scott SK, Randy Kutcher, University of Saskatchewan

Project Code: 3.6.3

Final Report: April 2013

Summary: Growers may wish to limit herbicide use to reduce costs, crop injury, environmental concerns and herbicide-resistance selection pressure. However, reducing herbicide inputs can increase crop production risks. Economic losses can occur when low herbicide rates substantially reduce weed control and increase weed competition with
crops. Overall, the study results showed that for relatively competitive, narrow-row crops such as barley and canola, the negative effects of high soil weed seedbanks can be mitigated if growers achieve healthy crop canopies with appropriate seed and fertilizer rates in combination with judicious herbicide applications to adequately
manage recruited weeds.

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