Hopefully one or more of them will work on your farm. They are not listed in a prioritized order but some of them will have more impact on water savings than others. Leave some ground idle and apply the water to the high value crops. Since irrigation districts have to keep their system charged with water, this idea would have a greater impact if everyone in the district cut back on irrigated acres. Do not over irrigate sounds simple but is not easily accomplished.
Most growers tend to err on the side of excess when it comes to irrigation.
They are available on the Internet at at the Malheur Experiment Station website or directly at . The charts make fairly accurate estimates of crop water use. This can help you estimate when you need to irrigate. Soil moisture monitoring equipment will tell you how much moisture is in the soil. There are several types of sensors available.