Effects of bacterial fertilizer and peat soil extract on soil Cd extracted by plants
A greenhouse pot experiment was used to study the effects of bacterial fertilizer and peat extract solution on the biomass and cadmium enrichment characteristics of Sedum alfredii,the Cd availability and physical and chemical properties of the soil,and the Cd content of the subsequent rice crop under dry conditions.The results showed that,bacterial fertilizer and peat soil extract improved the extraction efficiency of heavy metals from the soil by Sedum alfredii,and applying two liquid bacterial fertilizers had the greatest effect.The amount of Cd extracted by Sedum alfredii was 0.34 mg·pot-1,which was 2.1 times greater than that of the control,and the amount of Cd extracted by Sedum alfredii treated with peat extract was 0.32 mg·pot-1,which was 1.9 times greater than that of the control.The phytoextraction rates of Cd were higher for these two treatments,reaching 13%-15%,and the reduction in total soil Cd content ranged from 17.55%to 20.41%.Compared with the control,Cd extraction by rice grains and straw increased by 30.31%-396.24%and 12.36%-257.65%,respectively.Cd uptake by rice was highest under the combined treatment of bacterial fertilizer and peat extract,resulting in a Cd content of 2.14 mg·kg-1 in the rice grains and 2.88 mg·kg-1 in the straw.The total Cd extraction rate of rice shoots reached 3.15%.Therefore,the double application of microbial fertilizer is an effective measure to enhance the phytoextraction of Cd from the soil by Sedum alfredii,and the combination of microbial fertilizer with peat extract has the potential to promote the phytoextraction of Cd by rice under dry conditions.
万方数据
维普
