One of the major agricultural innovations was the introduction of what into rice paddies?

Name: One of the major agricultural innovations was the introduction of what into rice paddies?
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The introduction of fish into rice paddies is a form of aquaculture and has been a major innovation in agriculture. The fish help to control pests and fertilize the rice plants, leading to better yields and healthier rice. This system is still used today in many parts of the world.

One of the Major Agricultural Innovations Was the Introduction of What