Negative volume

Not that it has been awhile since I was able to fill the chicken’s dust bath, but the volume in the tire was negative.

Photo description: old rubber tire used as a chicken dust bath with the inside soil level below the tire and surrounding ground level
Photo description: approximately six gallons of dust bath mixture (wood ash, soil, and diatomaceous earth) added to the tire bath

There is room for another batch or two of dust bath mixture.