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Growing things deplete the nitrogen and other nutrients in soil. Crop rotation was implemented just to offset the reduction in nutrients. Plants use nutrients at various levels. For example, corn uses a lot of nitrogen in a growing season, but soybeans and alfalfa process and store nitrogen in the roots. Farmers in the corn belt will sometimes plant soybeans two years in a row on ground that grew corn for one year.

For lawns, the same sort depletion of nutrients occurs. Homeowners can buy fertilizer to replace the nitrogen, phosphorous and potassium when the lawn needs nutrients. Lawns with the clippings left on them need 25 to 30% less fertilizer applications according to university studies in Missouri and elsewhere.

Some people rake their lawns or use bag mowers, many because they don't know why they are doing it. Bagging grass clippings is recommended where the type of grass tends to create a thick thatch. Thatch is bad, because it smothers the grass, restricting air and water flow. This does not apply to the vast majority of lawns, particularly those with fescue and ryegrass. Ryegrass is very good at returning nutrients to the soil.

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