Effects of Lime and Cadmium Compound Action on Cd Content and Accumulation Characteristics of Panax notoginseng

PurposeUnder the combined application of lime and Cd²⁺, the biomass and Cd content of Panax notoginseng and its accumulation characteristics were studied.

MethodThe field trials were conducted to determine the soil pH, soil available cadmium content, Cd contents and accumulation characteristics of P. notoginseng under the combined application of lime 0 (CK), 750 and 1 500 kg/hm² and Cd²⁺ (0, 0.6, 3.0, 6.0, 9.0 and 12.0 mg/kg).

Result(1) With the increase of lime application amount, the contents of available Cd in soil decreased significantly (P<0.05) and pH value increased. When the amount of lime application was 1 500 kg/hm², the contents of available Cd in soil decreased significantly by 9.2%-38.1%.(2) Under 3 mg/kg Cd²⁺ treatment and 1 500 kg/hm² lime application, the biomass of P. notoginseng main root, stem-leaf and total increased by 74.4%, 41.4% and 31.1%, respectively. (3) When Cd²⁺ treatment concentration 3.0, 6.0, 9.0 and 12.0 mg/kg with 1 500 kg/hm² lime application, the contents of Cd in the main roots were significantly decreased by 13.0%, 5.8%, 13.2% and 17.6% (P<0.05), compared with the control. When Cd²⁺ concentration was 6.0, 9.0 and 12.0 mg/kg and 1 500 kg/hm² lime application, the contents of Cd in shoot was significantly decreased by 13.6%, 12.4% and 20.8% (P<0.05), respectively, compared with CK.

ConclusionLime application could significantly increase soil pH value (P<0.05), decrease the soil available Cd contents and Cd absorption and accumulation in P. notoginseng and increase biomass of P. notoginseng.