The largest irrigation district in China, called Hetao, faces problems like water scarcity and inefficient irrigation. To fix this, they need to use different methods like upgrading the irrigation systems, better farming practices, and smarter water use. This means lining channels, leveling the land with lasers, and using less water by planning crops better and reusing things like straw. They also need to use chemicals to help the plants cope with less water and manage water more wisely. By doing all of this, the Hetao irrigation district can save water and farm more efficiently.