Today was dahlia planting day and it was lots easier than the glads yesterday. I found a piece of channel steel amongst my odds and ends and clamped it to the bottom of the sub-soiler, thinking it might spread the dirt better.
It actually worked pretty well.
It got a lot of the dirt out of the trench, and what was left was soft enough that I could just push the dahlia tubers down through it and get them at a depth of about 6 inches.
Fifteen minutes of hunkered-down scrabbling along was enough to get 100 tubers planted. The tractor did the rest of the work, filling the trenches by driving backward using the loader bucket to smooth out the soil.
And I never touched a shovel.