“Alperujo” Compost Improves Nodulation and Symbiotic Nitrogen Fixation of Soybean Inoculated with Bradyrhizobium diazoefficiens

The utilization of compost to enhance plant productivity and symbiotic nitrogen fixation (SNF) has been recognized as an effective alternative synthetic fertilizers. This environmentally sustainable method is readily accessible farmers. study investigated the effect olive pomace (“alperujo”, AL) on nodulation SNF soybeans (Glycine max L.) their natural symbiont (Bradyrhizobium diazoefficiens). For that, soybean plants were subjected several doses AL under controlled greenhouse conditions. At end experiment, dry weight biomass (aerial part roots), number fresh nodules, leghaemoglobin contents analyzed. application significantly improved growth, demonstrated by increase in both height. Furthermore, nodular content found be enhanced addition (7 40%, respectively), indicating nodule effectiveness efficiency. Our results provide clear evidence synergetic soybean-B. diazoefficiens association, probably due AL-compost roots development, rhizospheric organic matter nutrients assimilation rhizobia.