CAAR advises all Manitoba members and producers of the information regarding the restriction on winter application of nutrients from the Manitoba Sustainable Development website.

Restriction on Winter Application of Nutrients

Provincial legislation prohibits the application of nitrogen and phosphorus between and including November 10th of one year and April 10th of the following year. Nutrient sources containing nitrogen and/or phosphorus include synthetic fertilizer and livestock manure. The winter spreading restrictions are in place as the application of nutrients onto frozen or snow-covered soils results in an increased risk of nutrient runoff. Nutrient runoff to waterways contributes directly to algal blooms in Lake Winnipeg and elsewhere.

However, there may be some years where weather conditions are such that agricultural land can reasonably be worked to apply nutrients between November 10th of one year and April 10th of the following year for crop uptake while still protecting water quality. In these cases, a provincial or regional variance may be issued.

No provincial variance in effect. Nutrients cannot be applied on or after November 10, 2017.

For more information please go to

Help CAAR Advocate for You

CAAR is an active participant in the advisory group working with Manitoba Sustainable Development to review the option for a variance to spring and fall nutrient application deadline dates.

CAAR will again join the advisory group to meet with Manitoba Sustainable Development in spring 2018 to assess the possibility of a variance to the April 10 deadline. Make your voice heard for your region. Contact the CAAR office at This email address is being protected from spambots. You need JavaScript enabled to view it. to be added to CAAR’s agronomist outreach list. Thank you to the agronomists who provided important feedback to the fall 2017 session.

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