Phosphorus

However, with your help it can be improved. In 2001, the City of Elk River passed an ordinance that bans the use of phosphorus in lawn fertilizer. The only exceptions are in the establishment of new turf or if the results of a soil test prove that your lawn is lacking. Also, commercial applicators must be licensed through the City.

Why ban the use of phosphorus?

Phosphorus increases the growth of plants. Any fertilizer or waste that runs off of driveways and other impervious surfaces ends up in ditches and gutters, which carry it to the lake. The phosphorus in the fertilizer provides food for algae, which makes the water green and murky. It also depletes oxygen levels so that plant life and fish do not flourish. Unpleasant to swim in, algae is not generally dangerous to humans, but can be toxic to wildlife and pets.

Besides, our soils are naturally high in phosphorus and your lawn likely does not need it. Call Sherburne County Extension for a test kit (there is a small fee for the kit & analysis).

Unsure as to how to read a fertilizer label? See "Fertilizing Basics".

Other Ways to Keep Phosphorus Out of Our Waterways

Remove Yard Waste. Grass clippings and leaves are high in phosphorus. You may recycle nutrients by leaving finely chopped clippings on your lawn, but remove yard waste from high runoff areas such as sidewalks, driveways, and decks. DO NOT dump into ditches, lakes, streams, street gutters, etc.

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One easy way to create a buffer strip is to keep an unmowed buffer of native plants and grasses that grow 20-30 inches tall in a strip ideally 20-30 feet wide. The best buffer is mature woodland with undisturbed grass and shrub layers.

There may be monies available to create a buffer strip. Contact the Sherburne Soil and Water Conservation District or the Sherburne County Extension Office for advice on construction and/or funding.

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