Fig 1.

Distribution of the 119 strains isolated from soil under agricultural use into culture groups according to time (days) to appearance of isolated colonies and pH change of the medium: FA, fast growth, medium acidification; FN, fast growth, no alteration of medium pH; FAL, fast growth, medium alkalinization; FAN, fast growth, localized acidification, i.e., around the colonies; IA, intermediate growth, medium acidification; IN, intermediate growth, no alteration of medium pH; IAL, intermediate growth, medium alkalinization; IAN, intermediate growth, localized acidification, i.e., around the colonies; SA, slow growth and medium acidification; SN, slow growth, no alteration of medium pH; SAL, slow growth, medium alkalinization.