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The Heavy Plow and the Medieval Agricultural Revolution

What was the agricultural revolution of the High Middle Ages?

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  1. The Origin of the Heavy Plow
  2. The Structure of the Heavy Plow
  3. The Advantages of the Heavy Plow
  4. The Cost of the Heavy Plow
  5. The Limitations of the Heavy Plow
  6. The Legacy of the Heavy Plow
  7. Sources
  8. Related Articles

The heavy plow (also called the carruca or wheel plow) was one of the most important agricultural innovations of the medieval period. Developed in the late Carolingian period and gradually diffused across northern Europe in the tenth and eleventh centuries, the heavy plow was designed to turn over the heavy, wet soils of the North European plain that had resisted the lighter Mediterranean plow. The heavy plow was a major factor in the agricultural revolution of the High Middle Ages, and it contributed to the dramatic increase in agricultural productivity that supported the demographic expansion of the period. The heavy plow was a major technological innovation that transformed the European landscape and the European economy.

The standard treatment is B. H. Slicher van Bath, “The Agrarian History of Western Europe” (1963). The Domesday Book of 1086 is the primary source for the ploughs and teams of the English Midlands. The regional variation between the heavy-plow north and the Mediterranean south is the central thread.

The Origin of the Heavy Plow

The origin of the heavy plow is obscure, but the major roots of the innovation are in the late Carolingian period, perhaps in the eighth or ninth century. The Carolingian rulers were interested in agricultural innovation, and they encouraged the development of new agricultural techniques. The Capitulare de Villis (c. 800), a major Carolingian document on the management of royal estates, includes references to the carruca (heavy plow) and the aratrum (light plow), and it suggests that the two types of plows were in use in the Carolingian Empire.

The heavy plow gradually diffused across northern Europe in the tenth and eleventh centuries, and it became the standard form of plow in northern France, England, Germany, and the Low Countries by the eleventh century. The diffusion of the heavy plow was a gradual process, and it was closely related to the expansion of cultivation into the heavier soils of northern Europe and to the development of the village community as the basic unit of agricultural production. The heavy plow was a key factor in the agricultural revolution of the High Middle Ages.

The Structure of the Heavy Plow

The heavy plow was a complex implement with several components that worked together to turn over the heavy, wet soils of northern Europe. The major components of the heavy plow were:

The heavy plow was a substantial implement, weighing perhaps 100-150 pounds, and it required a team of eight oxen to pull it. The plowman guided the plow with the handles, while the oxen provided the power to pull the plow through the soil. The plow produced a series of parallel ridges and furrows that improved drainage and aeration of the soil, and it created a pattern of cultivation that was well-suited to the heavy soils of northern Europe.

The Advantages of the Heavy Plow

The heavy plow had a number of important advantages over the lighter Mediterranean plow. First, it was able to turn over the heavy, wet soils of northern Europe that had resisted the lighter plow. The heavy soils of northern Europe — the clay soils of the Loire valley, the chalk soils of England, the loess soils of Germany — were difficult to cultivate with the lighter plow, and the heavy plow was essential for the cultivation of these soils. The diffusion of the heavy plow made it possible to cultivate the heavy soils of northern Europe that had been impossible to cultivate with the lighter plow, and it contributed to the expansion of cultivation into previously marginal lands.

Second, the heavy plow improved the drainage and aeration of the soil. The ridges and furrows produced by the heavy plow improved drainage by allowing excess water to flow off the fields, and they improved aeration by exposing the underside of the soil to the air and the sun. The improved drainage and aeration of the soil contributed to higher yields and to a more sustainable agricultural system. The heavy plow was a major factor in the sustained productivity of European agriculture for centuries.

Third, the heavy plow created a pattern of cultivation that was well-suited to the three-field system. The ridges and furrows produced by the heavy plow facilitated the rotation of crops and the fallowing of fields, and they allowed for the efficient use of the manorial and village organization of agriculture. The combination of the heavy plow and the three-field system was a major factor in the agricultural productivity of medieval Europe.

The Cost of the Heavy Plow

The heavy plow was expensive to buy and to maintain, and it required a team of eight oxen to pull it. The cost of a heavy plow and team was typically beyond the means of an individual peasant, and it was often provided by the lord of the manor or by a group of peasants who pooled their resources. The use of the heavy plow stimulated the development of cooperative labor arrangements in the medieval village, and it was a factor in the emergence of the manor as the basic unit of agricultural production.

The cost of the heavy plow was also a factor in the emergence of the open-field system of agriculture. The peasants who shared the use of a single heavy plow needed to coordinate the plowing, sowing, and harvesting of the fields, and they needed to share the strips of land in a manner that ensured a fair distribution of the work and the produce. The open-field system was a response to the need for cooperation in the use of the heavy plow, and it was a major institution of medieval agriculture.

The Limitations of the Heavy Plow

The heavy plow was not without limitations. The heavy plow required a team of eight oxen to pull it, and the cost of the oxen was a major burden on the peasant household. The oxen required food and shelter throughout the year, and they were vulnerable to disease and death. The loss of an ox was a major setback for a peasant household, and the maintenance of the oxen was a major factor in the economy of the medieval village.

The heavy plow was also vulnerable to breakage, and the repair of the plow was a major task that required the skills of a specialist craftsman — the plowwright. The plowwright was a major craftsman in the medieval village, and his services were essential for the maintenance of the heavy plow. The plowwright was a member of the carpenters’ guild or the woodworkers’ guild, and he was a highly respected member of the medieval community.

The heavy plow was also slow and labor-intensive, and it required a team of plowmen and ox-drivers to operate. The plowing of a field was a major operation that required the cooperation of many people and animals, and it took a significant portion of the agricultural year. The slowness and labor-intensity of the heavy plow were factors in the development of the cooperative labor arrangements of the medieval village, and they contributed to the centrality of the village in the medieval agricultural system.

The Legacy of the Heavy Plow

The heavy plow was a major innovation in the history of European agriculture, and it contributed to the demographic and economic expansion of the High Middle Ages. The heavy plow made it possible to cultivate the heavy soils of northern Europe that had been impossible to cultivate with the lighter Mediterranean plow, and it contributed to the expansion of cultivation into previously marginal lands. The heavy plow was a major factor in the transformation of the European landscape and the European economy in the High Middle Ages.

The heavy plow remained the standard form of plow in much of Europe until the eighteenth or nineteenth century, and it was gradually replaced by the iron plow and the steel plow of the modern era. The heavy plow is a major subject of modern historical and agricultural study, and it is a subject of ongoing debate in the modern era. The heavy plow is a powerful example of the innovative spirit of medieval European agriculture, and it is a major contribution to the history of European agriculture and the history of European technology.

Sources

Principal sources used in this article:

Further reading:

For a recent single-volume synthesis with full scholarly apparatus, see the relevant chapter of Barbara H. Rosenwein, A Short History of the Middle Ages (University of Toronto Press, 2014).