2020. Assessment of Heavy Metal Pollution Using the Geo-accumulation Index (I-Geo), Pollution Load Index (PLI) and Potential Ecological Risk Index (RI) in Paddy Field Soils Adjacent to Ultrabasic Soils. University of Thi-Qar Journal of agricultural research. 9, 2 (Nov. 2020), 85–97. DOI:https://doi.org/10.54174/utjagr.v9i1.108.