I know this isn’t how folks have been doing it in the past but I’d suggest adding some N to your fields at the same time you throw your seed out instead of waiting. We had to plant wheat at the new land this year due to the shortage of rye. We fertilized at planting with a 4-wheeler spreader while I bushhogged with the tractor. Well, the little spreader didn’t do the best job of getting a nice wide even spread…..and when we came back a couple weeks after germination you could clearly see where we hit and where we missed. Biomass takes up N after it’s put on the ground and temporarily locks it up. You could obviously see the wheat looking N deficient in the areas we missed. I think you would see a much quicker jump out of the ground from your plots to go ahead and add 50 lbs/ac of 34-0-0 with your seed......then come back in a few weeks and hit it with your heavier application.