One of the greatest achievements was Tawantinsuyo eradicate the hunger, based on constant biological research, acclimatization, domestication of plants for human consumption, and great industriousness. Quechuas having two distinct natural seasons, in their rainy season and part of the dry were engaged in agriculture, and in the dry season were builders and craftsmen.
Few people in the ancient world developed agricultural infrastructure with features here had, just have a look at the fields near the Qosqo to imagine the deep agricultural conviction Tawantinsuyo where all the valleys and plains were cultivated, using even the dry, rocky slopes of mountains where farming terraces were built.