Heavy Plow is the second in line of farm techs. In addition to the previous techs your farms get +125 Food so they last longer before expiring and thus saves you wood. This techs also allows your villagers to carry one extra food when farming. The next farm tech is Crop Rotation.
Available to: All
Researched at: Mill
Requires: horse collar
Cost: 125 Food, 125 Wood
Effect: Farms +125 food; +1 peasant food capacity.