Why is the Ningxia plain suitable for farming despite its dry climate?

Despite its arid climate, the Ningxia plain is highly suitable for farming primarily due to the Huang He, which provides essential water for irrigation.21

This agricultural productivity is supported by an intricate, centuries-old network of canals that distribute river water across the plain. These irrigation systems, which date back as far as the Qin, Han, and Tang dynasties, have transformed the landscape into a fertile region capable of producing abundant wheat, high-quality rice, and various fruits. Additionally, the nearby Helan Mountains provide a crucial environmental benefit by acting as a shelter against sandstorms originating from the Tengger Desert, further protecting the agricultural land.213