Relationships between physico-chemical properties of the soil and rice selenium uptake in silakhor plain of lorestan province

Selenium is one of the essential micronutrients for human health. Since the amount of selenium in the plant is related to its amount in the soil and also the physical and chemical properties of the soil affect the amount of selenium uptake by the plant, therefore it is important to study the relationship between selenium uptake by the plant and physical and chemical properties of soil. In this study, first, different methods of selenium extraction were investigated to determine selenium concentration in the soil and rice grain in Silakhor plain of Lorestan province in 2021. Then, the correlation between soil properties and soil selenium content was investigated. The results showed that the extractable selenium with phosphate had a significant correlation with selenium uptake by plant (available selenium) and 0.1 M monopotassium phosphate solution (KH2PO4) could be used as the best extractor of selenium in the plant. There was also a significant correlation between soil selenium and some soil properties such as organic carbon content (-0.547*), calcium carbonate content (0.648**), clay percentage (-0.519*) and sulfate concentration (-0.275. The regression coefficient between soil and selenium properties of soil and plant was 0.72 and 0.68, respectively. Selenium concentration of rice grain in the region was between 1.016 to 1.985 mg / kg. Also, the concentration of selenium in the soils was between 0.17 to 0.52 mg / kg, which indicates that there is no deficiency of selenium in rice -cultivated soils in the Silakhor plain of Lorestan province.