Besides the potential for beneficial effects on plants either under nitrogen limitation (sphingomonas sp.,achromobacter sp.)or nitrogen avail- ability (sphingomonas sp. ,pseudomonas sp.,paenibacillus sp.),this set of isolates gathers a series of complementary functionalities that may be advantageous for combined use in different field situations, e.g. low levels of available phosphorus in soil or the need for protection against soil born phytopathogens.