Optimizing Determination of Irrigation Uniformity in the Design of Micro-irrigation System

By means of analyzing the relations between crop yield and water,and between/Irrigation uniformity and engineering cost, a rate function of engineering input/output was established. According to the function, the design value of irrigation uniformity for micro-irrigation system can be determined by means of optimizing method. Analytical results and a counting example show that it would unreasonable in economics if only a high irrigation uniformity is pursued.