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Delineation of Management Units for Site-Specific Irrigation

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

Citation:  Paper number  032145,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.13785) @2003
Authors:   Carlos W. Oliveira, Ronald E. Yoder, John B. Wilkerson, Daniel C. Yoder, James A. Larson
Keywords:   Irrigation scheduling, Site specific, Management, Determination, Economic analysis

A procedure to aid the decision-making process for delineating site-specific management units for irrigation was developed. The procedure consists of evaluating the management units through a site-specific irrigation schedule and a model that simulates the effects of water deficit on crop yield. Areas of the field are first grouped into minimum management units, which have the least amount of AWHC variability. The management units are then evaluated through an economic response model. The framework is general and portable for different soil and weather conditions. The procedure was tested in a case study for tomato production to evaluate the different field layouts, from the maximum number of minimum management units (site-specific irrigation) to the whole field (uniform irrigation). The optimum layout was site-specific layout 4 with three management units and the highest average annual net return ($17,381/ha $7,614/ha for a 16.24 ha field).

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