Need help with Fertilizer recommendation Cool Season Grass
I'm located in SE Wisconsin zone 5B. I overseeded my lawn in Aug/Sept of 2025 with Twin Cities Blue Resiliance. I had my soil tested in late March 2026 and results said to apply a starter grade fertilizer, to build "P" levels for both my front and backyards in May 15-31. I applied Lawn Synergy's 15-20-10, which came out to be 0.54 lbs of nitrogen per 1,000 sq ft.
I skipped the July application just cause it was too darn hot and I figured I'd stress the grass. Soil test call for the Sept 1-15 application of a general fertilizer (20-30% N, 0 P and less than 5 K to my front yard and it says to apply the starter again to my back yard.
I know from Niles Cool Season guide that he calls for 1-4 lbs of Nitrogen per 1,000 sq ft per year. So here's my dilema. I plan on overseeding again in another week or so with Blue Resiliance. Just plan on cutting super short and bagging the clippings, then scarifying several places that are really thin and in need of more coverage, then overseeding it all. If I lay the seed down and then put down the starter in the back in a week after, how will that effect my overseeding. And since I'm also overseeding the front yard how is it going to work if I put down a high N fertilizer on those new seeds. I can instead put down a starter in the front as well, but then is my lawn getting the nitrogen that it needs. I'm in need of y'alls help so I don't mess anything up.
