Document Type : Research Paper
Master graduated, Department of Soil Sciences, College of Agriculture and Natural Resources, Lorestan University, Khorramabad, Iran
Assistant Professor of Soil Science and Engineering, College of Agriculture and Natural Resources, Lorestan University, Khorramabad, Iran
Associate Professor of Soil Science and Engineering, College of Agriculture and Natural Resources, Lorestan University, Khorramabad, Iran
PhD graduate of Tarbiat Modares University
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 factors of the soil affect the amount of selenium absorbed by the plant in the soil, so study the relationship between selenium uptake by the plant and physical and chemical properties of soil it's too important. In this study, first, different methods of selenium extraction to determine its concentration in soil and rice grain in Silakhor plain of Lorestan province were investigated in 2021. Then, the correlation between soil properties and soil selenium content was studied. The results showed that extractable selenium with phosphate had a significant correlation with plant absorbable selenium (available selenium) and 0.1 M monopotassium phosphate solution (KH2PO4) could be used as the best extractor to extract plant-absorbable selenium in soil. 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*) was observed. There was no significant correlation with pH, EC, phosphate, sulfate, nitrate, silt and sand. 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 of this region 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.