A village leaves one of its fields unsown for a whole year. What did that achieve?
Explanation
A year without a crop let the ground rebuild what grain had taken out of it, and villagers turned their beasts onto the resting field so that the dung went straight back into the soil. Treating the practice as a church rule is a natural but wrong inference, because village life was full of religious observance, yet this arrangement was a farming technique settled by the villagers and their lord.