Inca agriculture was the culmination of thousands of years of farming and herding in the high-elevation Andes mountains of South America, the coastal deserts, and the rainforests of the Amazon basin. These three radically different environments were all part of the Inca Empire (1438-1533 CE) and required different technologies for agriculture. Inca agriculture was also characterized by the variety of crops grown, the lack of a market system and money, and the unique mechanisms by which the Incas organized their society. Andean civilization was "pristine"—one of six civilizations worldwide which were indigenous and not derivative from other civilizations. Most Andean crops and domestic animals were likewise pristine—not known to other civilizations. Potatoes and quinoa were among the many unique crops; Camelids (llamas and alpacas) and guinea pigs were the unique domesticated animals. The Inca civilization was predominantly agricultural. The Incas had to overcome the adversities of the Andean terrain and weather. Their adaptation of agricultural technologies that had been developed by previous cultures allowed the Incas to organize production of a diverse range of crops from the arid coast, the high, cold mountains, and the hot, humid jungle regions, which they were then able to redistribute to villages that did not have access to the other regions. These technological achievements in agriculture would not have been possible without the workforce that was at the disposal of the Inca emperor, called the Sapa Inca, as well as the road system and extensive storage systems (qullqas) that allowed them to harvest and store food and to distribute it throughout their empire.
Environment
The heartland of the Inca Empire was in the high plateaus and mountains of the Andes of Peru. This area is mostly above 3,000 metres (9,800 ft) in elevation and is characterized by low or seasonal precipitation, low temperatures, and thin soils. Freezing temperatures may occur in every month of the year at these altitudes. Westward from the Andes is the Pacific Ocean, its coast often called the driest desert in the world. Agriculture is only possible with irrigation waters from the many rivers originating in the Andes and crossing the desert to the ocean. Eastward from the Andes are the rugged foothills above the Amazon Basin, an area of abundant rainfall, exuberant vegetation, and tropical or sub-tropical temperatures.
Organization
In the Inca Empire, society was tightly organized. Land was divided in roughly equal shares for the emperor, the state religion, and the farmers themselves. Individual farmers were allocated land by the leader of the ayllu, the kinship group typical of both the Quechua and Aymara speakers of the Andes. The allocations of land to individual farmers depended upon kinship, social status, and number of family members. The farmers were expected to produce their own sustenance from the land they were allocated. Rather than being taxed on their production, farmers were required to work on the lands of the emperor and the state religion for designated periods. On the state lands, the Incas provided the inputs—seeds, fertilizer, and tools—to farmers. The farmers contributed their labor. Communities were essentially self-sufficient, growing a variety of crops, pasturing camelids, and weaving cloth. Private property existed in the form of royal estates, especially in the Sacred Valley near the Inca capital of Cuzco. Emperors customarily confiscated large quantities of land for their own use and exploitation and the estate was inherited by descendants after the emperor's death. The famous archaeological site of Machu Picchu was a royal estate. The royal estates made use of local labor, but also were staffed by a servant class called yanakunas who were ruled directly by Inca nobles and were outside the ayllu kinship system. In some areas, such as the valley of Cochabamba in Bolivia, state farms were dedicated to the production of maize, the prestige crop of the Incas but one which could not be grown at the higher elevations of the Andes. In the oasis valleys on the desert coast, the population was more specialized, divided mostly into farmers and fishermen with trade relationships between the two.
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