Final answer:
The technological advances in agriculture during the Middle Ages in Europe included crop rotation, horse-drawn plows, and watermills.
Step-by-step explanation:
A major technological advance in agriculture during the Middle Ages in Europe was the development of a 3-field rotation system for planting crops.
This involved planting different crops in a field each year and allowing the field to lie fallow every few years. This rotation system helped replenish nutrients in the soil and increased overall crop yields. Additionally, the invention of the heavy plow and the use of horse-drawn plows made farming more efficient, particularly in heavier soils. Watermills were also introduced for various agricultural purposes, such as grinding grain.