Heavy metal contamination of Pb, Cd, and Cr in soil and rice grains harms the environment and human health if the content exceeds the safe threshold. This study aimed to determine the accumulation of Pb, Cd, and Cr in soil and rice grain in irrigated rice fields at the Tajum sub-watershed, Banyumas Regency. The rice fields of location sampling in the Tajum subwatershed area were Pekuncen District (Karangkemiri Village, Pasiraman Kidul Village), Ajibarang District (Ajibarang Kulon Village), Wangon District (Cikakak Village), Jatilawang District (Tinggarjaya Village), Rawalo District (Memanti Village and Village Pesawahan), Purwojati District (Karangtalun Kidul Village). The grid system was applied for soil and rice grain sampling. The study results showed that the Pb, Cd, and Cr in the soil increased in all locations during one growing season even below threshold limit values except Cd. Mostly found that Pb, Cd, and Cr in rice grains exceed the threshold limit values. Pb in rice grain ranged from 0.78 to 26.93 mg/Kg, while Cd 0.04 to 1.83 mg/Kg, and Cr 3.43 to 7.54 mg/Kg. According to the Pollution Index, all areas of rice fields were polluted by Pb, Cd, and Cr with criteria of medium to high.
Banyumas regency; heavy metals; pollution; rice production; Tajum sub-watershed