Tithe series and grain production in modern Spain: Guadalajara 1700-1800

The following paper presents original tithe series for the province of Guadalajara in New Castile. The series include the four main grains, wheat, barley, rye and oats and their evolution during the eighteenth century. The series complete previous estimations of grain production for New Castile and suggest that the eighteenth century was a period of growth. However the increase was not a sustained process, but one with intense imbalances with production reaching its peak in the mid 1750s followed by a deep crisis and very weak recovery. Wheat was clearly the most important of the four grains in volume and especially in value. Its predominance was maintained thanks to a demand encouraged by the demographic that took place during the eighteenth century. A comparison with other tithe series from the interior of Spain reveals similarities like the crisis of the late 1750s.