What was the advantage of a rotating crops medieval europe

Rotating crops every year makes sure that whatever crop is being planted gets the nutrients it needs from the soil.

Explanation:

The soil is being run dry of a certain nutrient because it is being taken by whatever the crop is. If you rotate the crop for the next year, those nutrients will replenish while a different nutrient is being taken for use by the new crop.

I believe the answer is because it makes the soil more fertile