Biosolids are an excellent source of plant nutrients; however, it can contaminate the soil. The aim of this work was to assess the influence of the fertilization with sewage sludge compost and calcium and magnesium silicate on the levels of heavy metals in soil and in castor plants. The experiment was conducted at the Institute of Agrarian Sciences (ICA) of UFMG in Montes Claros, MG, from June to December 2010. The cultivation was carried out in area of Inceptisol, using the castor bean plant (Ricinus communis L.) variety BRS energy. The experiment was conducted in randomized blocks, in factorial scheme 4 x 2, with 3 replications consisting of 2 doses of calcium and magnesium silicate (0 and 1 t ha-1) and 4 doses of sewage sludge compost (0; 23.81; 47.62 and 71.43 t ha-1, on dry weight basis). There was no interaction between the doses of calcium silicate and sewage sludge compost, as well as, the calcium and magnesium silicate did not influence the levels of heavy metals in soil and plant. In soil, the levels of Zn and Cu increased with the increase in dose of sewage sludge compost, however Ni, Pb, Cd and Cr were not influenced by the application of residue. In the plant, increasing dose of sewage sludge compost increased only the Cd and Pb levels.
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机译:生物固体是植物营养的极佳来源;但是,它会污染土壤。这项工作的目的是评估污水污泥堆肥,钙和硅酸钙和镁的施肥对土壤和蓖麻植物中重金属含量的影响。该实验于2010年6月至12月在位于蒙大拿州蒙特斯克拉罗斯的UFMG农业科学研究所(ICA)进行。使用蓖麻子植物(Ricinus communis L.)品种BRS在Inceptisol地区进行了种植。能源。该实验按因子分解方案4 x 2随机分组进行,共3次重复,包括2剂钙和硅酸镁(0和1 t ha-1)和4剂污水污泥堆肥(0; 23.81; 47.62和71.43 t ha-1,以干重计)。硅酸钙和污水污泥堆肥的剂量之间没有相互作用,并且硅酸钙和硅酸镁不影响土壤和植物中的重金属含量。在土壤中,锌和铜的含量随污水污泥堆肥剂量的增加而增加,但是镍,铅,镉和铬不受残留物的影响。在工厂中,增加污水污泥堆肥的剂量只会增加Cd和Pb的水平。
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