关键词: 生物炭, 肥料, 烟叶, 土壤, 镉胁迫, 镉含量

Abstract: In order to explore the feasibility of combined application of biochar and  different fertilizers to reduce Cd absorption of tobacco leaf and the content of Cd in soil, a pot experiment was designed to study the effects of applying biochar and different fertilizers under Cd stress on the biomass of tobacco leaves, the Cd content in different parts of tobacco, the Cd ontent in tobacco-growing soil, and soil pH. The results showed that (1) the application of biochar and fertilizer could promote the increase of biomass in tobacco leaves, and the order of biomass in tobacco leaves was organic fertilizer + inorganic fertilizer + biochar > inorganic fertilizer + biochar > organic fertilizer + inorganic fertilizer > inorganic fertilizer > CK; (2) Cd content in  different parts of tobacco leaves applying biochar and different fertilizers was lower, compared with the treatment of applying organic fertilizer and inorganic fertilizer; Cd content in leaves decreased 52.57% under application of biochar and organic fertilizer with inorganic fertilizer at reproductive period, and Cd contents in roots and stems were up to 59.69%; (3) the contents of available Cd in soil of each treatment were decreased by different degrees, and the decreasing amplitude was organic fertilizer + inorganic fertilizer + biochar > inorganic fertilizer + biochar > organic fertilizer + inorganic fertilizer > inorganic fertilizer > CK. Thus, the application of biochar and inorganic fertilizer or organic fertilizer could promote the growth of tobacco leaves, reduce the absorption and accumulation of Cd, and reduce Cd content in tobacco leaves, so the application of biochar and organic fertilizer and inorganic fertilizer was suitable for the soil with heavy metal pollution.

Key words: biochar, fertilizer, tobacco leaf, soil, Cd stress, Cd content