Final answer:
New agricultural technologies such as plows and seeders were introduced during the Middle Ages, greatly improving farming efficiency and crop yields.
Step-by-step explanation:
One agricultural development during the Middle Ages was the introduction of new agricultural technologies such as plows, seeders, and harvesting tools. These innovations greatly enhanced agricultural production by making farming more efficient and less labor-intensive. Farmers were able to increase their crop yields, which helped to feed the growing population of Europe during this time.