When asked why he doesn’t irrigate his crops to increase yields, Dr. Johnson simply replies: “Well, then what would we pray for?” Hopi farming is a testament to his faith. And faith is tied directly to water. That’s what makes Hopi agriculture so resilient–it’s faith-based. This means it can withstand droughts, seasons with minimal growth, and the cycles of life. It's important to Dr. Johnson to continue this practice, and part of that practice means not bringing man-made lines to irrigate crops. Hopi seeds, or what he refers to as “hardy” seeds, would not know what to do with all the extra water. They have been adapted to grow within an unmanipulated environment—a quintessential trait of Hopi farming: raising crops to fit the environment, rather than manipulating the environment to fit the crops.
I'm all for rational and scientific approaches to agriculture and to engineering problems in general, but these faith-based farmers who have learnt to grow and eat the crops that do well in their environment make the people growing bananas in Iceland look pretty foolish. Imagine what could be achieved with a scientific approach to working with natural systems instead of trying to overcome them. (And imagine what could be achieved if those banana growers in Iceland simply moved to the tropics.)