Israel’s N-Drip (see here previously) has developed a unique zero-energy gravity-powered micro-irrigation system for crops that have a very low profit margin, like corn and potatoes. N-Drip’s Chief Sustainability Officer is Seth Siegel, author of “Let there be Water” (featured here previously).
https://www.israel21c.org/new-gravity-watering-system-saves-resources-and-raises-yields/