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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.

Mill and Farm technologies in Age of Empires III
Mill aoe3de MillSeed Drill · Artificial Fertilizer
Farm aoe3de Farm*Selective Breeding · Great Feast · Harvest Ceremony · Green Corn Ceremony · Large Scale Gathering · Flag AztecDE Cinteotl Worship · Flag IroquoisDE Strawberry Festival · Flag SiouxDE Horsemanship · Flag IncanDE Urcuchillay Worship
* introduced in The WarChiefs
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