Co-inoculation of soybean with Azospirillum brasilense and Bradyrhizobium spp. is an increasing practice in Brazil, but little is known about the conditions that maximize crop efficiency. In this study, data from field experiments run between 2009 and 2020 in Brazil were gathered to evaluate which environmental and agronomic conditions affect the response of soybean to bacterial co-inoculation. Results showed that co-inoculation of soybean increased root mass in 11%, nodule number in 5.4%, nodule mass in 10.6%, N concentration in shoots in 2.8%, grain yield and N concentration in grains in 3.2% and 3.6% respectively compared to the conventional single inoculation with Bradyrhizobium spp. Grain yield was used to discriminate co-inoculation efficiency, and soybean was more responsive to the simultaneous inoculation with B. japonicum and B. diazoefficiens in sandy soils, non-tillage system, tropical climate, soybean cultivars with determinate growth habit, and grain yield class lower than 3500 kg ha⁻¹. Co-inoculation can also be important to mitigate the effects of water stress on plants. Co-inoculation of soybean with A. brasilense and Bradyrhizobium spp. demonstrated to be an efficient technology that contributes to the sustainability of soybean production.

大豆与巴西拟螺旋体和根瘤菌属的共接种。在巴西，这种做法正在增加，但对使作物效率最大化的条件知之甚少。在这项研究中，收集了2009年至2020年在巴西进行的田间试验的数据，以评估哪些环境和农艺条件会影响大豆对细菌共接种的反应。结果表明，共接种大豆可使根部质量增加11％，根瘤数量增加5.4％，根瘤质量增加10.6％，芽中氮素含量增加2.8％，谷物产量和谷粒中氮素含量分别增加3.2％和3.6％。常规的根瘤菌单次接种spp。谷物产量用来区分共同接种效率，大豆对沙质土壤，免耕系统，热带气候，具有确定生长习性的大豆品种和谷物产量同时接种日本芽孢杆菌和重氮芽孢杆菌的反应更加敏感。等级低于3500 kg ha ^-1。共同接种对于减轻水分胁迫对植物的影响也很重要。大豆联合接种A. brasilense和根瘤菌属。被证明是一种有效的技术，有助于大豆生产的可持续性。