We removed a couple of big trees and did some trimming of others last fall - three oak trees and a hickory. The firewood has been cut and given to a friend, but I've got a lot of small limbs to burn. I'll have to push the piles of branches around with a tractor, and it'll make a real big bonfire.
My vegetable garden is 35' x 50', and it's clay soil amended with compost I've been adding for years. I've added small amounts of wood ashes to the soil before, but never this much. I'm thinking of building the bonfire in the garden, where the fire might kill a lot of weed and crabgrass seeds in the soil - then plowing and tilling the ashes in deep.
I remember the way lye soap was made with wood ashes in the old days, though, and I don't want to get the soil pH off too much on the alkaline side. What do you think?