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.
Questa, New Mexico
Agriculture, especially the cultivation of alfalfa, hay, and winter wheat has experienced renewed interest along with the expansion of agriculture to historic crops and crops of high value. Agriculture in Questa is strongly dependent on irrigation, supplied from the Red River and Cabresto Creek. The system of ditches or acequias which supply water to the fields are of great community and social importance; the burning of the ditches on the first weekend after the vernal equinox is a major community event. Two major 'ditch associations' control the distribution of water by controlling the outflow from the Cabresto Lake dam: the Acequia Madre and the Llano ditch.