For example, mixtures have demonstratedincreased repeatability of efficacy over multiple field trials(Jetiyanon et al., 2003). In addition, mixtures of several strainsmay result in a more stable rhizosphere community and provideseveral mechanisms under field conditions (Domenech et al.,2006). In the future, the PGPR treatments used in the current studyshould be evaluated in multiple field conditions, to test theirconsistency