Soil application of red mud (RM), which is a by-product generated during the processing of bauxite into alumina using the Bayer process, with beneficial microorganisms can represent a promising alternative for revegetation of contaminated areas. Nevertheless, to date, there are no studies on their simultaneous application as well as the use of regionalized strains of microorganisms. This study aimed to evaluate the benefits of the application of RM combined with the co-inoculation of soybean with Bradyrhizobium spp. and strains of beneficial microorganisms isolated from the Amazon in soils from contaminated areas. The study was carried out under greenhouse conditions, using co-inoculation of soybean seeds with Bradyrhizobium spp. plus Trichoderma asperellum, Bradyrhizobium spp. plus Bacillus amyloliquefaciens and only with Bradyrhizobium spp. (standard), in soil containing or not RM (1%). Plants growth/biometrics parameters, gas exchange, chlorophyll a fluorescence, nodulation and root architecture were evaluated. The interaction of RM with B. amyloliquefaciens promoted changes in root architecture, increasing the percentage of thin roots (< 1 mm) in length and volume. Moreover, RM application increased the net photosynthetic rate by 8.8%. The variables related to water use efficiency (up to 6.9%), electron transport rate (up to 5.8%) and root volume (up to 23%) were also increased. The results indicate the feasibility of incorporating RM in soils used for revegetation of contaminated areas. RM interaction with B. amyloliquefaciens co-inoculation promoted changes in the root architecture of soybean plants.

赤泥（RM）是利用拜耳法将铝土矿加工成氧化铝过程中产生的副产品，其含有有益微生物，在土壤中应用赤泥（RM）可以成为污染地区植被恢复的一种有前景的替代方案。然而，迄今为止，还没有关于它们的同时应用以及区域化微生物菌株的使用的研究。本研究旨在评估应用 RM 结合大豆与慢生根瘤菌 ( Bradyrhizobium spp) 共接种的效益。以及从亚马逊污染地区土壤中分离出的有益微生物菌株。该研究是在温室条件下进行的，将大豆种子与慢生根瘤菌 ( Bradyrhizobium spp ) 共同接种。加木霉、慢生根瘤菌。加上解淀粉芽孢杆菌，并且仅含有慢生根瘤菌属。（标准），在含有或不含 RM (1%) 的土壤中。评估了植物生长/生物特征参数、气体交换、叶绿素a荧光、结瘤和根结构。RM 与解淀粉芽孢杆菌的相互作用促进了根结构的变化，增加了细根（< 1 毫米）长度和体积的百分比。此外，施用RM使净光合速率提高8.8%。与水分利用效率（高达6.9%）、电子传输率（高达5.8%）和根体积（高达23%）相关的变量也有所增加。结果表明将 RM 掺入土壤中用于污染地区植被恢复的可行性。RM与解淀粉芽孢杆菌共接种的相互作用促进了大豆植物根结构的变化。