Answer:
In attempting to use farming techniques not suited to the region, farmers in the Andes had weak crop yields. However, these same farmers are adopting the complex Incan farming methods with great success. For instance, growing corn, quinoa, and squash together forms a symbiotic relationship in which each plant benefits the other.
The Inca Empire, also known as Incan Empire and the Inka Empire, and at the time known as the Realm of the Four Parts, was the largest empire in pre-Columbian America.
Incan 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.