Core Insights - The Xinjiang Uyghur Autonomous Region's Natural Resources Department and the Xi'an Geological Survey Center have completed a comprehensive soil geochemical survey in southern Xinjiang, covering nearly 210,000 square kilometers over nine years, identifying 54 elements and indicators in the soil [1][2] - A significant finding is the discovery of a "selenium belt" stretching nearly 1,000 kilometers along the southern Tianshan Mountains, with 4.9 million acres of selenium-rich land, including 1.13 million acres of selenium-rich farmland, accounting for 27% of the arable land in southern Xinjiang [1][2] Group 1 - The soil geochemical survey focused on oasis areas, collecting 24,000 data points on nutrient elements, heavy metals, and health-related elements, resulting in the most systematic and spatially precise soil geochemical mapping data for southern Xinjiang to date [1] - The survey identified that 10% of the certified selenium-rich land in China is located in five areas of southern Xinjiang, totaling nearly 300,000 acres [1] - In addition to selenium, the survey found that calcium and magnesium-rich lands cover 99.3% and 91.8% of the oasis area, respectively, while molybdenum-rich land accounts for 20.2%, primarily in the Aksu-Kuerle region [1] Group 2 - Based on over 2,000 samples of plants and animals, the survey identified 22 types of selenium-rich products, including three grain crops (wheat, rice, corn), seven fruits and vegetables (fresh chili, fresh tomato), three livestock products (eggs, chicken, beef), and two spices (garlic, cumin) [2] - The survey data covers 97% of the arable land in southern Xinjiang, with all farmland classified as alkaline soil, of which 33.4% is strongly alkaline; 99.8% of the soil is classified as priority protection clean soil [2] - The soil nutrient evaluation indicates that the total phosphorus and potassium content is primarily moderate to rich, with 908,100 acres of high-quality farmland and 2,102,700 acres of suitable soil for green food production identified, mainly in the Yarkand Basin, Kuqa Basin, along the Aksu River, and western Kashgar [2]