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Advances in Deficit Irrigation Management

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  5th National Decennial Irrigation Conference Proceedings, 5-8 December 2010, Phoenix Convention Center, Phoenix, Arizona USA  IRR10-9277.(doi:10.13031/2013.35870)
Authors:   Derrel L Martin, Raymond J Supalla, Christopher L Thompson, Brian P McMullen, Gary W Hergert, Paul A Burgener
Keywords:   Deficit irrigation, water use efficiency, irrigation uniformity, irrigation water balance

Scarcity of irrigation water supplies is leading to the need to consider deficit irrigation which is the intentional under-irrigation of crops resulting in evapotranspiration and yield reduction. We present analytical tools that can be used to assist irrigators and water managers in assessing the water balance and economic consequences of various alternatives. We combine a water balance model of an irrigated field with crop production functions and nonlinear optimization to identify optimal cropping choices and irrigation water allotments to crops. The methodology has been developed for planning for deficit irrigation management for conditions ranging from one field for a single year to allocation programs that focus on farms with multiple fields and multiannual water supply constraints. Example applications are presented to illustrate the methodology for some typical conditions in the Central Great Plains of the United States.

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