[Effects of a Tribasic Amendment on Cadmium and Arsenic Accumulation and Translocation in Rice in a Field Experiment].

An paddy field experiment was carried out to study the influence of a tribasic amendment (QFJ, hydroxyapatite+zeolite+biochar) on Cd and As accumulation and translocation in rice grown in soil contaminated with cadmium and arsenic, with the concentrations of soil Cd and As being 3.58 mg·kg and 124.79 mg·kg, respectively. The results showed that, after application of QFJ, the pH, CEC, and OM contents of the rice rhizosphere soil tended to increase. The exchangeable concentrations of Cd and As were reduced from 0.37 mg·kg and 0.07 mg·kg to 0.12 mg·kg and 0.04 mg·kg, respectively. The concentrations of Cd and As in rice tissues decreased after restoration. When 9.00 t·hm of QFJ was applied, the Cd concentration in brown rice was reduced from 0.46 to 0.18 mg·kg, and that of inorganic As was reduced from 0.25 to 0.16 mg·kg, both lower than 0.2 mg·kg, meeting the requirement set by the National Food Standards (GB 2762-2012). QFJ application decreased the Cd and As bioaccumulation capacity of the roots and decreased the rice plant's capacity of Cd translocation quantity from the underground parts to the aerial parts; at same time, the Cd transferring capacity of the roots and the As transferring capacity in straw and husk were also decreased.