Too many people do not do this to increase their grass hay yields! 

Treated is the only thing I use. It’s only $30/ton more and totally worth it if an expected rain doesn’t materialize.

I don’t irrigate, so whatever falls out of the sky is what I get and I can’t do anything about it!

I do have nitrogen in the spring as ammonium sulfate and coated urea. But I go back and add more nitrogen after each cutting as it gets spent quickly. Heavy growth in first cut will consume most of the nitrogen added in the spring. Sometimes I skip urea in the spring because it slows the grass down so it isn’t over mature by the time I’m able to cut it.

Yes, NPK is added in the spring, usually around March or early April. I add based on soil test. Then after first cut I top dress with more nitrogen.

Yes that works great. You just don’t want to incorporate it too deep.

I am in SW Michigan.

This is orchard grass and Kentucky bluegrass with a little bit of red clover.

You would need to do a soil test to really see what your yard needs. Urine is only 2% urea, and half of that would be nitrogen, so about 1% nitrogen total from urine urea. Not enough to do anything. If you don’t want to do a soil test, do they sell bagged yard fertilizer down there in home-improvement type stores?