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.
Water resources management in Uruguay
The World Bank has contributed with Uruguay government in several projects related to water resources management. In the context of the Natural Resources Management and Irrigation Development Project a soil and water management strategy was formulated and implemented to increase, diversify and maintain agricultural production and exports of individual farmers. As a result of the project, over 2,400 farmers made investments to increase by almost 20% the irrigated areas in the country (from 35,000 hectares to a total of 190,000 hectares), where land devoted to irrigated rice crops accounted for almost 77% of the total. Despite the fact that irrigated rice fields still maintain a relatively high importance, the Project decisively supported diversification. The expansion of irrigated rice fields (19,000 hectares) financed by the project was almost fully related to the expansion of cattle breeding systems, a process by which the irrigated rice and forage crops were integrated to the use of the soil in rotation with pastures. In addition, the expansion of irrigated areas for the production of fruits and vegetables supported by the project (16,000 hectares) represented an increase of over 100% regarding the initial area where these products were grown which contributed to a considerable growth in the production of high-value crops and non-traditional exports.