The application of biochar and oyster shell reduced cadmium uptake by crops and modified soil fertility and enzyme activities in contaminated soil

Abstract. Soil pollution with cadmium (Cd) has been threatening the human health. In this study, we investigated possibility of applying biochar and oyster shell to reduce Cd uptake by crops modify soil quality. A field study based on rice–oilseed rape rotation was done, treatments were comprised without amendments (PA0) 15 000 kg ha−1 (PA1), (PA2), 7500 (PA3). Results revealed that both reduced HOAc-extractable in soil. Compared PA0, PA1, PA2, PA3 4.76 %–20.79 %, 17.86 %–38.61 5.95 %–10.89 respectively. The cooperative application accumulation brown rice oilseed 29.67 % 19.74 respectively, compared control thus decreased hazard quotient (HQ) from consumption oilseed. addition slightly increased organic matter. addition, available P PA2 significantly (p<0.05) 200.96 %–295.92 187.46 %–280.04 control. Moreover, enhanced activities urease, catalase, β-galactosidase 139.44 %–147.56 10.71 %–34.31 82.08 %–244.38 These results demonstrated utilization might be an effective pathway reducing improving fertility enzyme activities.