| An in situ field experiment was conducted in a Cd contaminated paddy soil to reveal the effects of optimized agricultural management strategy on Cd absorption and accumulation by rice, in the smelting area of Hunan Province. Taking hybrid rice（named Zhong you 978） as an sample in this experiment, lime application at end of booting stage combined with following continuous water-logging was selected as optimized agricultural management, simultaneously traditional agricultural management as a control. To evaluate effects of optimized agronomic management on Cd uptake by rice, the concentrations of Cd in different rice tissues at five key growth stage were examined. Results showed that, rice yield increased by 33.24% in optimized agronomic management of lime application and subsequent continuous water-logging treatment compared to control treatment, Cd concentration of brown rice decreased by 39.32% compared to control treatment. So, lime application at end of booting stage combined with following continuous water-logging was an effective measure to reduce rice Cd concentration standard exceeding risk and showed favorable practicality because of its easy operability, and also can provide scientific support and basis for food safety production and supervision. |
