Agriculture in the prehistoric Southwest
After the Hohokam disappeared, Spanish explorers of the 16th century noted the use of canal irrigation in only two areas of the Southwest: eastern Sonora, primarily practiced by the Opata and Lower Pima, and among the Pueblos of northern New Mexico. Irrigation by the Opata and Pueblos had different objectives. In Sonora, with a long growing season, two crops of maize a year were grown in river valleys. The spring crop during the dry season was dependent upon irrigation; the summer and fall crop during the rainy season utilized irrigation to supplement rainfall. The necessity of irrigation probably required a high level of social organization. In New Mexico, with only one crop of maize per year possible, irrigation was supplemental and the lesser dependence on irrigation implies less social organization than in Sonora.
Opata
The Opata depended upon agriculture for most of their subsistence. Maize, beans, squash, and cotton were the principal crops. Due to the scarcity and irregularity of rainfall, the Opata practiced canal irrigation as well as dry-land farming techniques. Early Spanish explorers described large and productive fields among the Opata. The Opata also hunted game, especially deer, with bows and arrows, fished in the rivers with spears and nets and gathered wild foods, such as Chenopodium and cactus leaves and fruits. They also produced a fermented maize atole beverage known as "tanori", which was normally drunk during certain ceremonies and celebrations. (Expert preparers of that beverage often took on the second name of "Tanori".)