Watermelon growing in a crack in the stone. The main producing area of selenium sand melon in Zhongwei is located in the west of Ningxia Hui Autonomous Region, which is the junction of Ningxia, Mongolia and Gansu provinces. The altitude is1800-2300m, and the landform types are divided into five units: Yellow River alluvial plain, terrace, desert, mountain and hill. The soil type is calcareous soil or sandy loam, the groundwater level is extremely deep, and the pH value is 7.5-8.5, which is suitable for planting watermelon. Zhongwei selenium sand melon is oval, with light green skin background and dark green stripes on it. The fruit is branded with gravel pads, and the weight of a single melon is more than 5 kg.
The flesh is bright red, the flesh is sweet and crisp, the seeds are dark brown, the peel is tough, the thickness is 10 mm-15 mm, and it is resistant to storage and transportation.
Central defender Xisha melon is not sweet and has no money.