Abstract
Soybean cultivars have various responses to the inoculation of Rhizobium japonicum. Inoculation of Rhizobium japonicum does not always have a positive response to soybean growth and yield. This study was conducted during March – June 2022 to analyze soybean cultivar's response to inoculation of Rhizobium japonicum in the coastal area. This research has two factors that are arranged in Complete Randomized Design (CRD). The first factor of Rhizobium inoculation is with and without Rhizobium japonicum inoculation. The second factor is soybean cultivars, namely Grobogan, Burangrang, Argomulyo, Anjasmara, Dena 1, Gema, Kaba, Wilis, Sinabung and Gepak Kuning. The results indicated that soybean cultivars gave various responses to Rhizobium japonicum inoculation. Rhizobium japonicum inoculation can increase the nitrogen fixation of soybean cultivars in coastal sandy land. Anjasmara cultivar gave the best response in fixing nitrogen. Indicators of nitrogen fixation can be seen from the number of root nodules, root nodule dry weight, and shoot N uptake. These results can have implications in optimizing Rhizobium inoculation in coastal sandy lands to sufficient nitrogen requirements.
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