Depends on your soil fertility and weather. I have a poor yield because I
have poor soil and not a lot of good compost. If I till in a good one foot
high stand of fall rye before planting, my yield goes way up. Since my soil
is quite poor, the plants succumb to potato blight as the tubers form thus
decreasing my yield. Potatoes like an acidic soil. Homespun potatoes are the
best especially potatoes with the silky skins.

Farmer John