 The system of infield and outfield agriculture, a variation of open field farming widely used across Europe, may have been introduced with feudalism and would continue until the eighteenth century. This expanded from the use of small enclosed fields, which continued from the prehistoric era. The infield was the best land, close to housing. It was farmed continuously and most intensively, receiving most of the manure. Crops were usually bere (a form of barley), oats and sometimes wheat, rye and legumes. The more extensive outfield was used largely for oats. It was fertilised from the overnight folding of cattle in the summer and was often left fallow to recover its fertility. In fertile regions the infield could be extensive, but in the uplands it might be small, surrounded by large amounts of outfield. In coastal areas fertiliser included seaweed and around the major burghs urban refuse was used. Yields were fairly low, often around three times the quantity of seed sown, although they could reach twice that yield on some infields. The main unit of land measurement in Scotland was the davoch (i.e. "vat"), called the arachor in Lennox. This unit is also known as the "Scottish ploughgate". In English-speaking Lothian, it was simply ploughgate. It may have measured about 104 acres (0.42 km2), divided into four raths.
