Augering holes around dripline
We had a lot of work done in the yard last fall and this spring. We thinned a dense forest down to keep the large, healthy, straight trees.
In the process of this work there were trucks in the yard. And we had some of the site graded to correct some low spots that were causing problems. The guys who did the work said all the right things to indicate they understand trees (they didn't use the bulldozer anywhere near the trees & spread a thin layer of loam by hand over the root zones).
But still - there were trucks in the yard and I'm pretty sure some soil compaction has happened around the trees we want to keep alive. So I bought an auger (1.5" diameter, 18" long) to aerate the soil around the drip line.
Question is - what do I put in the holes after I drill them? I've read that I should use peat moss, peat + manure, and small gravel. Will peat last, or will I have lots of holes in the yard in a few months?
Any ideas on what the right answer is? I planned to do this this week or next (while I have time off). Is there a good or bad time to do this?