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.
Antelope Creek phase
The Antelope Creek people grew corn, beans, squash and probably sunflowers. The Texas Panhandle is a marginal area for unirrigated agriculture, prone to drought and with the bulk of the 16- to 20-inch annual rainfall coming in a few thunderstorms that cause flooding. Thus, the Antelope Creek people probably practiced water harvesting or “Ak-Chin” dryland farming techniques. Crops were planted in arroyos or other depressions which caught runoff from thunderstorms and preserved enough moisture to permit crops to grow and mature. Given the unpredictability of rainfall, a family probably planted small fields – as did other Southwestern peoples—in several different micro-environments with the objective of maximizing the possibility that some of their fields would be productive. In their farming, the Antelope Creek people used bone-tipped digging sticks and bison scapulas as shovels and hoes.