Fate and health risk assessment of heavy metals in Brassica chinensis L. (pak-choi) and soil amended by sludge-based biochar

Zhang, Shijie; Gu, Weihua; Bai, Jianfeng; Dong, Bin; Zhao, Jing; Zhuang, Xuning

doi:10.1007/s11356-022-22358-5

Cited by 4 publications

(2 citation statements)

References 37 publications

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“…Biochar (BC) is a carbon-rich and porous material with a high specific surface area, which is produced by the pyrolysis of biomass under high temperature and anaerobic conditions. Nowadays, it has been verified that BC can promote plant growth, enhance nutrient retention and reduce soil contamination [8][9][10][11][12][13][14][15][16]. As a soil amendment, BC is widely used as an environmentally friendly material for heavy metal remediation in soil and water [9,10].…”

Section: Introductionmentioning

confidence: 99%

“…As a soil amendment, BC is widely used as an environmentally friendly material for heavy metal remediation in soil and water [9,10]. Biochar can increase soil cation exchange and organic matter [11], and reduce the biological effectiveness and transportability of heavy metals in soil [12], thus decreasing the absorption and accumulation of heavy metals in plants [13]. Under Cd stress, BC application can increase soil pH, enhance soil aggregate stability and adsorb and precipitate heavy metals in soil, thus reducing Cd accumulation in plants [14,15].…”

Section: Introductionmentioning

confidence: 99%

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Significant Synergy Effects of Biochar Combined with Topdressing Silicon on Cd Reduction and Yield Increase of Rice in Cd-Contaminated Paddy Soil

Su,

Cai,

Pan

et al. 2024

Agronomy

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Pot and field trials were conducted to explore the combined effect of biochar (BC) with topdressing silicon (Si) on Cd uptake by rice and grain yield in Cd-contaminated paddy soil. The treatments, including BC applied before transplanting (TBC), topdressing Si applied in the soil at the jointing stage (JSi) and BC combined with topdressing Si (TBC + JSi), were designed in a complete random block, and treatment without application of BC and Si was used as a control (CK). Results showed that Cd concentration in milled rice treated with TBC + JSi was decreased by 34.62%, 22.73% and 10.53%, respectively, when compared to CK, TBC and JSi, with the concentration being only 0.17 mg·kg−1. At rice maturity, available Cd in the soil was reduced by 7.98% (TBC), 4.76% (JSi) and 6.02% (TBC + JSi) when compared with CK, while the concentrations of total Cd were 32.07% (TBC), 27.85% (JSi) and 35.44% (TBC + JSi) higher than CK. Moreover, BC and Si increased the Cd sequestrated by leaves markedly, especially for TBC + JSi, which was much higher than TBC and JSi. Therefore, the transfer of Cd from leaf to milled rice was greatly decreased by TBC + JSi. In addition, a synergy effect of TBC + JSi on rice yield was also found. Compared with CK, the grain yields of TBC, JSi and TBC+ JSi were increased by 8.35%, 8.20% and 18.74%, respectively. Nutrient contents in soil and rice plants were also elevated by the application of BC and Si to a certain extent; for example, the contents of nitrogen (N), phosphorus (P), potassium (K) and Si in soil treated with TBC + JSi were raised by 8.96–60.03% when compared with CK. Overall, the combined application of BC with topdressing Si not only increases soil nutrients significantly, promotes their uptake by rice and boosts grain yield, but also effectively inhibits Cd transfer and reduces its accumulation in rice, which ultimately guarantees milled rice security. These results also imply that the combined application of biochar with topdressing silicon might be considered as an effective agronomic measure to decrease the milled-rice Cd in Cd-contaminated paddy soil, which would guarantee food security.

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