I have been out of town for 10 days. I compared 5 treatments, each on one sqft on a low-quality bluegrass lawn, non-irrigated, applying 1/2 ounce of seed,about 31 pounds per thousand sqft, (Scotts Classic seed). Temperatures were cool--its 44 degrees now. soil temp is 45.
Seed after aeration
Seed just prior to aeration
Slits in soil
Soil topdressing (about .16 " )
16 days later, it was difficult to tell the difference, but treatments with soil topdressing, and secondly, seed applied before topdressing showed the best result. The tallest seedlings were about a half-inch tall.