Anden E3

[Lorna Schildt]

Anandn (plural andenes), Spanish for "platform",[1] is a stair-step like terrace dug into the slope of a hillside for agricultural purposes. The term is most often used to refer to the terraces built by pre-Columbian cultures in the Andes mountains of South America. Andenes had several functions, the most important of which was to increase the amount of cultivatable land available to farmers by leveling a planting area for crops. The best known andenes are in Peru, especially in the Sacred Valley near the Inca capital of Cuzco and in the Colca Canyon. Many andenes have survived for more than 500 years and are still in use by farmers throughout the region.

The benefits of andenes include utilizing steep slopes for agriculture, reducing the threat of freezes, increasing exposure to sunshine, controlling erosion, improving absorption of water, and aerating the soil.[2] The construction and use of andenes for crops enabled agriculture in the Andes to expand into climatically marginal areas of low or seasonal rainfall, low temperatures, and thin soils.[3]

The Spanish conquest of Peru in 1533 led to a demographic collapse in the Andes, as the Indigenous population precipitously declined due to European diseases and war. With lessened population pressure, many farmers relocated or were relocated by force in accordance with the Spanish policy of reductions to flatter and more easily cultivated lands. Also, the Spanish introduced oxen and horses as draft animals and plows. Andenes were difficult to access by these innovations, being most suitable for the hand tiller. In the 19th century with population growth, a number of andenes came back into use,[7] but in the late 20th century 60 to 80 percent of andenes had been abandoned for growing crops, although they may be used for grazing.[8]

Andenes were complicated to build, requiring provisions for drainage and irrigation. The first step in constructing an andn was to lay an underground or bedrock foundation about 1 metre (3.3 ft) deep to lend strength and stability to the retaining wall, which might rise about 2 metres (6.6 ft) above the slope of the ground. Behind the retaining wall, the bottom one metre (3.3 ft) was filled with large stones, overlaid by a layer about 1 metre (3.3 ft) thick of sand or gravel. Capping the top of the terrace was a layer of topsoil about 1 metre (3.3 ft) thick. The result was a terrace providing "well-drained rich soil and a level surface for growing crops."[9] At prestigious or royal sites, such as Machu Picchu, finely cut stone was used as the outer (visible) face of the retaining wall. The planting surface of an andn is variable, but in the Colca Valley averages 3 metres (9.8 ft) wide.[10]

In the steep terrain of the Andes, flat and good farming land was scarce. The adverse climate in much of the Andes was another negative factor for agriculture, which the use of andenes helped overcome. Much of the Inca Empire was found at elevations of more than 3,000 metres (9,800 ft) above sea-level. Farmers grew crops up to an altitude of about 4,250 metres (13,940 ft).[14] Frosts impacting crops, however, can occur above an elevation of 2,200 metres (7,200 ft).[13]

The stone retaining walls of andenes absorbed the sun's heat during the day and radiated it at night, warming the soil and preventing damage to frost-sensitive crops such as maize. An important objective in constructing andenes was to permit maize to be grown at elevations above its usual climatic limit of 3,200 metres (10,500 ft) up to 3,500 metres (11,500 ft). Maize was a prestige crop for the Incas and earlier cultures, but of the crops cultivated in the Andes, it is the most demanding of water and nutrients.[15][16]

Efforts to rehabilitate and bring andenes back into production near Cuzco began in the 1970s.[5] In 2014, the Peruvian Ministry of Agriculture and the Inter-American Development Bank began a project to rehabilitate andenes, including those near Laraos in the Lima region.[17]

The andenes possess an appeal beyond the historical and their original economic motivations: they are also landscape resources whose situation in the Andes Mountains has notable aesthetic value. Many of them follow the natural curve of the slopes in such a way that preserves the visual harmony of the environment. The idea of hanging gardens in the mountains can fit well with the description of the Andenes.

At the Salinas de Maras near Cuzco, andenes are used to create 3,000 salt pans to evaporate salt. The andenes and salt industry are believed to date to pre-Incaic (before 1430 CE) times. A distinctive pink-hued salt is still being produced in the 21st century.[18]

Between central Peru and northern Bolivia are found the best conserved collection of andenes. Perhaps the most impressive Andenes zone is the Colca Canyon (Valle de Colca), whose terraces were constructed by the Collaguas beginning in the 11th century. Those on the islands in Lake Titicaca (constructed by the Aymara) are visually stunning, as are those in the so-called Sacred Valley of the Incas (Valle Sagrado de los Incas) in Cusco, those constructed by the Incas in Moray (Inca ruin) in a collection of concentric circles, as well as the enormous terraces at Pisaq and Ollantaytambo.

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