Coverage
For uniform coverage, divide seed into two equal parts, spreading one half in a north-south pass and the other in an east-west pass. Applying the proper amount of seed is key. Too little seed results in a thin stand and increased competition from weeds. Too much seed causes over-crowding and increased competition for nutrients and water.
Over-seeding
A properly calibrated commercial drill/slice seeder provides the best results. Many professional seeder options are available that drill/slice the soil, place the seed and firm the row in one pass, ensuring good seed-to-soil contact. Core aeration followed by broadcast seeding is popular with many turf managers. The more cores per square foot, the more opportunities for seed-to-soil contact. For smaller areas, use a rake to remove debris, thatch and loosen the first few inches of soil. Broadcast the seed and lightly rake in. Intimate seed to soil contact is vital for success.
New Seed Establishment
Till and prepare the seedbed with adequate drainage that is free of low spots. Properly adjusted commercial drill seeders and slice seeders will produce the best results. Seed may be broadcast over the prepared seedbed and followed by a cultipacker, roller, rake, or drag to ensure good seed-to-soil contact.