Originally Posted by Smallaxe
I did that and it worked however,,, that is the same as an Early Spring app of N,,, which of course is bad policy, in that N should be done only after the 2nd or 3rd mowing...
I don't think it is quite the same but it would be interesting to see a side by side test. Seems to me that fall compost topdressing would not cause near the same flush of (useless) growth as 1/2# sythetic N applied, say, April 15.
It has probably been done but let's imagine 6 plots where we:
1 do nothing Fall or Spring
2 apply 1# synthetic N Oct 15
3 topdress with 1/2 cu yd compost/M Oct 15
4 apply Milorganite at 1/2# N Oct 15
5 apply Urea (granular) at 1/2# N April 15
6 apply Milorganite at 1/2# N April 15 (too early, I know)
And we take photos, examine roots, and measure top growth on April1, April 15, May 1, and May 15. Personally, I rarely put any N down before May 15 and it is usually a week later than that. I will make exceptions, for one season, if no fertilizer has been applied since the previous Spring.