Villagers gather Food from Mills faster.
—In-game description

Seed Drill is a technology in Age of Empires III that can be researched at the Mill once the Colonial Age is reached. Once researched, it allows Settlers, Coureurs des Bois, and Settler Wagons to gather food from Mills, Farms and Rice Paddies 15% faster. Artificial Fertilizer is the further upgrade of this technology.

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