SITUMORANGA.R. F., MUBARIKN.R. and TRIADIATIT. 1. <p class="MsoNormal" style="text-align:justify;text-indent:14.15pt;"><strong><span style="font-size:9pt;">Land with low pH soil spread widely in Indonesia can be used for soybean (<em>Glycine max</em>) cultivation, although the production is low. The use of acid tolerant soybean and acid-Al tolerant nitrogen-fixing bacteria was an alternative way to increase soybean productivity on acid soils. This research was conducted to study the influence of acid-Al tolerant <em>Bradyrhizobium<span>  </span>japonicum </em><span> </span>on growth of Slamet cultivar soybean planted on acid soils in greenhouse. Three strains of acid-Al tolerant <em>B. japonicum</em>, i.e. BJ 11 (19), BJ 11 (5), and BJ 11 (wt), were used in this experiment. The result showed that inoculation of all acid-Al tolerant <em>B. japonicum</em> strains could increase plant height, shoot and root weight, number of flowers, pods, seeds, seeds dry weight, and shoot and seed nitrogen content.</span></strong></p> <p class="MsoBodyText2" style="line-height:10.8pt;"><strong><span style="font-size:9pt;"> </span></strong></p> <strong><span style="font-size:9pt;"><span>                </span></span></strong><span style="font-size:9pt;">Key words: <em>Bradyhizobium japonicum, </em>acid-aluminium tolerant, soybean, Slamet cultivar</span&gt;. HAYATI Journal of Biosciences. 16, 4 (1), 157. DOI:https://doi.org/10.4308/hjb.16.4.157.