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Impact of copper nanoparticles on onion (a) total sugars, (b) crude protein, (c) moisture, (d) ascorbic acid and, (e) ash contents, under chromium stress. Treatments are presented as, N0 = without Cu NPs, N1 = 10 mg kg−1 Cu NPs, N2 = 15 mg kg−1 Cu NPs, with normal soil (NS) and with metal Cr (10 mg kg.−1) contaminated soil (MCS). Results are represented as means of 3 replications. Means sharing same letter donot vary significantly at p < 0.05
