An Experimental Center-Pivot Irrigation System for Reduced Energy Crop Production Studies

A N experimental 52.6 ha center-pivot irrigation system for studies of reduced energy crop production systems is described. The system consists of high pressure impact sprinklers, low pressure impact sprinklers, and low pressure spray nozzles that are automatically turned on or off at preselected locations in the field. The control procedures of the system operation are described. The system also has the capability of applying different depths of water per irrigation as a function of position radially outward from the pivot point. Four years of data indicate that the system controls function properly and the design irrigation depths are being met. The concept of rotational uniformity or the spiking of water application as the pivot rotates is presented. Fiel