Your grass should be cut often enough so that not more than one-third of the grass blade is removed at any one time.ĭon't leave piles of heavy, wet clippings on the lawn. If clippings are removed, then the only way to keep fertility up is to keep adding more fertilizer." "I consider mowing more important than fertilizer if clippings are returned via a mulching mower. "Frequent mowing, about once a week during the growing season, will have a greater impact on turf quality than any other lawn care practice except irrigation in the summer," he said. If you plan to leave the clippings, mow the lawn often. 5 percent phosphorus and 2.5-3.5 percent potassium, said Cook. Grass clippings contain up to the equivalent per weight of 3-4 percent nitrogen. "And on lawns growing in clay soils, I have produced acceptable quality turf for as long as 12 years without adding any fertilizer at all." "Our research has shown that we can cut the fertilizer application rate almost in half when we return clippings with a mulching type rotary mower," explained Cook. Leaving clippings helps save fertilizer costs and thereby prevents ground and surface water contamination. Unless you've let the lawn grow excessively long, or the clippings are in thick clumps, grass clippings are a good source of nutrients. CORVALLIS - In case you've been wondering what to do with your grass clippings, just leave them on the lawn, advises Tom Cook, turf grass specialist at Oregon State University.
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