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Effect of nano copper oxide (nCuO) and copper chloride (CuCl2) on phosphorus (A) and potassium (B) accumulation in soybean seed. nCuO-S, nCuO-M, and nCuO-L represent nCuO-25 nm, nCuO-50 nm, and nCuO-250 nm, respectively, at 500 mg/kg-soil. Bars represent mean ± SD. Different letters above the bar indicate significant difference at p < 0.05 according to the LSD test
