What makes pivot irrigation such a bad approach?
What
@NorCalVol67 said, plus specifically, the extremely dry air and high altitude (thin air) means that much of the water evaporates before it hits the ground, so an absurd waste of water. I think the Navajo Nation’s ag farm pulls from the San Juan River, lowering its flow. If it pulled from an aquifer instead, it would be draining the aquifer while doing little more than raising the local humidity by a microscopic amount.
US aquifers are in bad shape, drawn down by industrial agriculture + lawn and golf course watering where grass wouldn’t normally grow (most of Texas, Las Vegas, SoCal, southwest in general, etc etc.) They’re not getting enough rainfall that soaks into the ground (as opposed to running off down rivers) to recharge them and keep up their levels.
Best irrigation method for nearly all ag settings, but especially arid climates, is drip irrigation.
Plants do not take in water from their leaves; only from their roots.* So water the soil, ideally an inch or more below ground, to distribute water to the roots.
*Plants do occasionally benefit from water on their leaves (rainfall etc.) which washes dust off them, which might be clogging their stomata (leaf pores), where they take in CO2 and release O2 and water vapor.
-haha, my professors will be pleased to know that I have retained something from classes and applied it to real-world applications.