In the area between Huesca and Madrid, the art of dry farming is practised. The fields are cultivated during the winter season when rainfall is just sufficient to grow crops. Harvesting takes place just before the summer heat dries out the ground. After the harvest and before rainfall, the soil is roughly ploughed to maximize water absorption. It is then sealed with rollers to reduce evaporation. The fields are also surrounded by stone walls and organized in terraces to minimize erosion.
