12.7: Growth in Agriculture
Eleventh-century Europe’s economy was primarily agricultural. The eleventh and twelfth centuries saw a massive expansion of agricultural output in the northern regions of Europe, which led to a corresponding growth in the economy and population. The same improvement in iron technology that allowed the equipping of armored knights led to more iron tools: axes allowed farmers to clear forests and cultivate more land, and the iron share of a heavy plow allowed farmers to plow deeper into the thick soil of Western Europe. In addition, farmers gradually moved to a so-called three field system of agriculture: fields would have one third given over to cereal crops, one third to crops such as legumes (which increase fertility in soil), and a third left fallow, i.e., uncultivated either to serve as grazing land for livestock or simply rebuild its nutrients by lying unused. More iron tools and new agricultural techniques caused yields to rise from 3:1 to nearly 8:1 and in some fertile regions even higher. Another factor in the rise of agricultural yields was Europe’s climate, which was becoming warmer in the eleventh, twelfth, and thirteenth centuries. As a result of both climate and new agricultural tools and techniques, food supplies increased so that Western Europe would go through the majority of the twelfth century without experiencing a major famine.
We should note that at the same time that agricultural yields were rising in Europe, so too were they on the rise in Song China (see Chapter Four). Indeed, compared to China, Europe’s agricultural production was still relatively meager. It was nevertheless enough to bring about a dramatic growth in Europe’s population.