Alexandre Hogue's "Erosion No. 2" from 1938
In case you don't get it, plow = penis. With a little bit of moisture and some seed, a good plow makes the earth's dry and crusty fields fertile again.
But don't forget to rotate your crops. I'll be in the home of America's great Dust Bowl this week. Just in case things get parched I always remember to pack my pocket plow. ;-)