Ms Lianqing Li1, Ms Fengfeng  Sui, Mr Genxing Pan, Jinbo Jinbo Wang

1Nanjing Agricature University,  Nanjing, China

There have been studies of the effects of biochar on immobilizing Cd in soil, few work study the remediation effect of biochar combined with Si. A field trial was carried out in a Cd contaminated rice paddy soil from 2016 to 2017 in three rice seasons in Hunan province, China. Biochar was applied only once at rates of 0, 10 t ha-1 (R1) and 20 t ha-1 (R2) at late rice season in 2016, sodium silicon was applied at every rice season with a rate of 0.75 (SS) t ha-1. Biochar combined with sodium silicon with treatments of  R1+SS and R2+SS was applied only once in 2016. The results showed that biochar combined with Si significantly reduced Cd concentration in rice grain. Translocation factor of Cd from root to shoot (TFR/S) under the treatment of biochar and Si-rich biochar decreased compared with control. Analysis of the fresh and contaminated biochar particles in season 3 indicated that Cd had complexed with Si, Al, Fe and O on the external and internal surfaces around and inside the contaminated biochar particles. This suggested that Si-rich biochar amendments can immobilize Cd in soil, and could effectively reduce the uptake of Cd in rice grain by reducing Cd translocation from root to shoot.


Biography:

I am a teacher. I am working in Nanjing Agricultural University in China. I am engaged in scientific research of soil  environment and science .

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