| 摘要 |
[Objectives] This study was conducted to investigate the effects of soil selenium (Se) content and exogenous Se supplementation on crop Se levels and provide a theoretical basis for the production of Se-enriched agricultural products. [Methods] Thirty three representative townships in Xiayi County, Ningling County, and Yongcheng City were selected. Soil Se content and its impact on wheat Se level were measured. The effects of exogenous Se supplementation on the Se content of crops including soybean, wheat, peanut, corn, sweet potato, grape, crisp pear and apple were also investigated. [Results] showed that the soil Se content in 18 townships of Xiayi County ranged from 0.08 to 0.34 mg/kg, and Se-adequate areas, Se-deficient areas and severely Se-deficient areas accounted for 27.78%, 66.67%, and 0.055% of the total, respectively. In Ningling County, the soil Se content in 11 townships ranged from 0.13 to 0.23 mg/kg, and among them, Se-adequate areas and Se-deficient areas comprised 18.18% and 81.82%, respectively. In Yongcheng City, the soil Se content in 4 townships ranged from 0.16 to 0.23 mg/kg, and Se-adequate areas and Se-deficient areas constituted 75.00% and 25.00%, respectively. The soil Se content in 33 townships across Xiayi County, Ningling County, and Yongcheng City ranged from 0.07 to 0.34 mg/kg. However, the Se levels in wheat from all 33 townships fail to meet the standard for Se-enriched agricultural products. It indicates that relying solely on soil Se supply is insufficient for crops to achieve the Se level required for Se-enriched agricultural products. Exogenous Se supplementation could effectively increase the Se content in soybean, wheat, peanut, corn, sweet potato, grape, crisp pear, and apple. Among these, soybean, wheat and peanut showed the highest Se levels after supplementation, all exceeding 0.10 mg/kg and meeting the industry standard for Se-enriched agricultural products. [Conclusions] The results of this study indicates that exogenous Se supplementation can serve as a key measure for producing Se-enriched agricultural products. |
