This research selected the soil and watermelon fruits as experimental materials, which were taken from 9 administrative villages in 3 townships in the main production area of watermelon in the dry sand land of Jingyuan, used the relevant national standards and high-performance liquid chromatography method to analyze the environment, product safety, and product quality of its production area, and the correlation analysis was carried out to scientifically evaluate the advantages of watermelon in dry sand land of Jingyuan. Results showed that the production environment and product quality and safety of watermelon could meet the standard of green food in the dry sand land of Jingyuan. The advantages in quality were obvious, specifically manifested in the crisp texture, thin peel, high edible rate, soluble strange solids and sugar-acid ratio with an average of 64.91%, 11.90, and 67.96 respectively, and the crude fiber content was as low as 0.29%. It was rich in lycopene, citrulline, calcium, magnesium, selenium, and other nutrients, with an average content of 15.49 mg/100 g, 1.64 g/kg, 67.93 mg/kg, 129.25 mg/kg, and 10.82 μg/kg. There were differences in the quality of watermelon products from different origins. Among them, the contents of total sugar, calcium, phosphorus, potassium, magnesium, and selenium in watermelon products in Gaowan Town were the highest. While the contents of lycopene, protein, vitamin C, citrulline, and arginine in watermelon products in Wuhe Town were the highest. In addition, single melon weight was significantly positively correlated with soil total nitrogen, organic matter and cation exchange capacity, and the nutrient element selenium was extremely significantly positively correlated with soil available phosphorus and organic matter. This research systematically analyzed and evaluated the characteristics of Jingyuan dry sand watermelon product quality, safety, good quality and high nutrition, and provided theoretical guidance for improving the quality and yield of watermelon in the dry sand land of Jingyuan.
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