Remove any debris from the seedbed, including rocks, trash and weeds. A uniform seedbed, without undesirable vegetation, is best for planting. Pick up rocks and gravel from the top 2 inches of the soil. Dispose of all plant matter, trash and rocks in the appropriate manner.
Loosen the top 4 to 6 inches of soil with a rototiller, going over the seedbed in several different directions. Rototilling the soil will help improve grass rooting and control undesirable vegetation. Top-dress the seedbed with 8 to 10 inches of topsoil. The topsoil will settle down to about 6 to 8 inches.
Collect soil samples during the growing season from at least eight different areas. Soil samples should be at least 2 to 4 inches deep, free of plant parts and mixed together thoroughly, with about 1 cup of the mixture put in a soil sample box. Send the sample to a local extension office for testing.
Apply the amount of fertilizer recommended by the soil test results to the top 4 to 6 inches of soil. If soil test results are not available, apply 10 to 15 pounds of a slow-release fertilizer (composition rating of 0-46-0) per 1,000 square feet. Till the fertilizer into the top 4 to 6 inches of soil.
Apply 2 inches of manure, compost, sphagnum peat moss or well-rotted organic matter over the seedbed. Organic matter improves drainage and nutrient content, and it reduces fertilizer leaching, diseases and weeds. Till the organic matter into the top 6 to 8 inches of soil with a rototiller.
Firm the soil with a water ballast roller. If the seedbed is to be sprigged, keep the top few inches of soil loose. Apply 1 1/2 to 2 pounds of a slow-release nitrogen fertilizer per 1,000 square feet. Till the fertilizer into the top 4 to 6 inches of soil. Rake the seedbed to make it uniform.
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