“…For example, yeast extract as a source of nitrogen, vitamins and other micronutrients is commonly used to prepare various media for culturing of rhizobia in research studies and for commercial purposes (Roughly, 1970;Vincent, 1981;Stephens and Rask, 2000). Many other substrates or industrial and agricultural by-product such as: proteolyzed pea husks (Gulati, 1979), corn steep liquor (Burton, 1979), malt extract (Bioardi and Ertola, 1985), cheese why (Bissonnette et al, 1986), or even wastewater sludge (Ben Rebah et al, 2007) have been proposed as media for rhizobial biomass production. e aim of this work was to examine if potato extract can be used as a basic source of nutrients for cultivation of root-nodule bacteria in liquid cultures.…”