* Terracing: The Incas built terraces into the mountainsides to create flat areas for farming. This helped to prevent erosion and allowed them to farm on otherwise unusable land.
* Irrigation: The Incas built canals and aqueducts to bring water to their crops. This was especially important in the dry coastal regions of Peru.
* Raised fields: The Incas built raised fields in low-lying areas to improve drainage and keep the soil from becoming too waterlogged.
* Crop rotation: The Incas rotated their crops to prevent the soil from becoming depleted of nutrients.
* Fertilization: The Incas used natural fertilizers, such as manure and compost, to enrich the soil.
These techniques allowed the Incas to farm successfully in a variety of environments, and they helped to produce enough food to support a large population.