Evaluation of Very Low Pressure Sprinkler Irrigation and Reservoir Tillage for Efficient Use of Water and Energy: Final Report

摘要

Two types of very low pressure devices were tested, spray nozzles and furrow drops (bubblers). For minimizing spray loss and maintaining uniformity, optimum conditions for spray heads are elevation about 6 feet, spacing 8 to 9 feet and pressure 15 to 20 psi. Use of furrow bubblers is not recommended for most regional conditions. Reservoir tillage with very low pressure systems reduces runoff on sloping fields while maintaining or slightly increasing yield. The total amount of water applied is slightly less because of reduction in spray loss. Effectiveness of reservoir tillage depends on the reservoir storing water until it infiltrates. Failure of the reservoirs during the season may result in increased runoff and erosion. Pressure regulators tested are adequate for their intended use. The uniformity of application using low pressure components was comparable to that of high pressure systems. Energy saving scan result from both low operating pressure and better application efficiency, but the relative importance of these two factors depends on individual circumstances. Payback times for some example systems are four years or less. (ERA citation 13:034177)