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In the last decade, farmers in the wet pampa region of Argentina, a region with longterm continuous agriculture, began using supplementary irrigation to avoid water stress during critical periods. Crop growth is usually affected during the summer by short periods of water defi cit that signifi cantly decrease crop yields. Supplementary irrigation is needed when natural precipitation is not adequate to secure grain and forage production (Abu-Awwad and Kharabsheh, 2000). Depending on the size of the farm and the type of irrigation system, application of water is often made possible by using modern power sources from deep well pumps and storage of large quantities of water in reservoirs, ponds, streams and rivers. City water is also often accessed directly by small farmers who use drip irrigation for their vegetable gardens.