subsoiler

The ordinary plough was to be followed in this case by a subsoiler, to stir the earth as deep as possible.

They should be thrown out as deep as can be done with a plow, then followed by subsoiler twelve to eighteen inches deep.

I prefer young, thrifty trees, planted in furrows made with a plow and subsoiler.

Let Sam take the plough, and have young Thompson follow with the subsoiler.

In planting, plow both ways with a coulter and subsoiler, then dig out.