As people’s awareness of the special functions of selenium continues to deepen, the development of selenium-rich food continues to develop, and selenium-rich places have been vigorously developing this resource-based industry. The development of selenium-rich agriculture is of great significance to improve people’s quality of life and promote agricultural, rural and regional economic development. This paper analyzes the factors affecting consumers’ willingness to purchase selenium-rich agricultural products in detail through questionnaire survey data of some consumers in Jiangxi, Ensh, Hubei and Ankang, Shaanxi, using three analytical methods of descriptive statistical analysis, factor analysis and logistic regression analysis with SPSS software. The research results show that consumers’ attitude toward selenium-rich agricultural products, price concerns, consumers’ family characteristics, health and environmental protection motives, gender and other factors have certain influence on consumers’ willingness to purchase selenium-rich agricultural products, among which the attitude factor and family characteristics have the greatest influence. Finally, the market prospect of selenium-rich agricultural products in China is analyzed and prospected, and the measures and suggestions for developing selenium-rich food are proposed in response to the problems of developing selenium-rich food in China.

Balancing food security with low-carbon agricultural development has become a major challenge for sustainable agri-food systems in the era of climate change. This study examines whether the major grain producing areas policy promotes the coordination between grain supply security and low-carbon agricultural development of 13 major grain-producing areas in China in 2004 as an institutional shock. Using panel data from 30 provincial-level regions in China from 1998 to 2023, we construct a coupling coordination index based on the normalized grain output and agricultural carbon-emission efficiency, and estimate policy effects using a Difference-in-Differences approach. The results show that the major grain-producing areas policy significantly improves the coordination between grain supply security and low-carbon agricultural development. This finding remains robust after placebo tests, PSM-DID estimation, the exclusion of municipalities directly under the central government, an alternative dependent variable test based on per capita grain availability, and a province-specific linear trend specification. Mechanism analysis indicates the policy primarily operates through scale operation and agricultural mechanization. Heterogeneity analysis shows the policy effect is more pronounced in inland provinces than coastal provinces, is significant in the eastern and central regions, but not significant in the western regions. Overall, this study provides causal evidence that regionally targeted agricultural policies can generate synergies between grain supply security and low-carbon agricultural development. It also offers policy implications for optimizing support in major grain-producing areas and advancing climate-smart agricultural development.