Location: Northwest Irrigation and Soils Research
Project Number: 5368-13000-008-01
Start Date: Sep 01, 2008
End Date: Aug 31, 2013
A center pivot simulator consisting of a 4-wheel commercial irrigation boom 154 ft in length will be towed at a constant speed over 3.3 feet (1 m) wide by 6.6 feet (2 m) long field plots on a 5% slope arranged in a 4 row by 4 column arrangement. The statistical design for evaluating treatment differences will be a Latin Square design. Multiple soil types will be evaluated by placing selected soils in the field plots. Irrigation treatments to be evaluated include sprinkler type, peak application rate, application depth, sprinkler operating pressure, drop size distribution and possibly other sprinkler operating characteristics such as drop size distribution, etc. The metrics for evaluating treatment effects include measured runoff volume, measured soil loss, measured application rate profile, and calculated effective infiltration rate. The database developed from evaluation of these sprinkler characteristics will be used to develop guidelines for center pivot sprinkler selection and management to minimize runoff and erosion for a specific soil type. This information will also be used to develop center pivot sprinklers specifically designed to minimize runoff and erosion for a specific soil type.