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4R Case Study Growing Green Waters (Phosphorous)
Prepared by Nutrients for Life CanadaTeacher Resource for 4R Case Study 2www.nutrientsforlife.ca
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What is Food Security and Sustainable Agriculture?
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Let’s Review: Challenges to Feeding the World..
Local Provincial
Federal Global
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Phosphorous is an Essential Nutrient
Globally there are about ten different sources of fertilizer phosphorous.
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• Phosphorous is held strongly in the solid phase.
• A little phosphorous
goes a long way.
• 1lb of phosphorous supports about 1000 lbs of algae!
Who Remembers the Phosphorous Cycle?
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Source: Statistics Canada in Honey, J. 2010. Crops in Manitoba.
Increasing Yields & Lake Winnipeg
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○ Between 1990- 2000, increases in the frequency and severity of algal blooms in Lake Winnipeg were present.
○ Large algal bloom covered 10,000 km2 of north basin in 2005.
○ Should this Lake water be green? Is this normal?
So Why the Concern In Manitoba?
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Source: Phosphorus for Life – Phosphorus and Water Quality (2014). Crops Nutrient Council.
Phosphorus Sources to Lake Winnipeg
What are the sources of Phosphorous inputs?
•53% Upstream Jurisdictions•17% Natural (Undefined)•15% Agriculture•9% Point Sources•6% Atmospheric Deposition
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A Solution to the Pollution - 4R Nutrient Stewardship
○ Nutrients are applied using the Right Source @ Right Rate, Right Time and Right Place with producers using Best Management Practices (BMP’s) to achieve economic, social and environmental sustainability.
○ Results are measured, evaluated and adjusted. ○ Farmer will determine which combination of BMP’s
will optimize nutrient use efficiency and economic return at the farm.
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Let’s 4R Discuss to Find Solutions Lets 4R Discuss about Phosphorous
1.Why is phosphorous a concern?2.What are the sources of excess phosphorous?3.Why is phosphorous making a comeback into some of the larger water bodies in Canada?4.What can we do to reduce phosphorous5.What are some possible solutions to solving the phosphorous challenge?