Abstract:

The application effects of various commercially available soil amendments in cadmium (Cd) -contaminated paddy fields were explored to ensure the safe production of rice and meet the safety standards. Field experiments were conducted in moderate cadmium-contaminated paddy fields using six commercially available soil amendments (“Tebeigai”, “Tuwobao”, “Luxi”, “Kangyuanbanger”, “Yurangkang” and “Chuyang”). The study assessed the impacts of these amendments on soil physical and chemical properties, available Cd content, Cd content in rice organs, and rice yield. The results showed that after the application of soil amendments, the average soil pH increased by 0.22 units, while the levels of available nitrogen, available phosphorus, available potassium and organic matter increased by 7.27%, 7.44%, 7.39%, and 2.99%, respectively. Additionally, the plant height, panicle weight, 1000-grain weight and rice yield increased by 4.72%, 4.54%, 3.50%, and 4.26%, respectively. Furthermore, there was a significant decrease in the available Cd content in the soil by 0.17 mg/kg, representing a decrease of 36.59%, and a significant decrease in the Cd content in brown rice by 57.72%. The six commercially available soil amendments tested had a positive impact on increasing rice yield in slightly Cd-polluted farmland. Additionally, they demonstrated a significant inhibitory effect on the absorption and accumulation of Cd. Among them, “Tuwobao” soil amendment had the best effect on reducing the content of available Cd in soil and Cd in brown rice, which could be popularized and applied.

Key words: amendment, enrichment coefficient, cadmium, soil fertility