Radar pattern illustrating the PGPR activities of Viridibacillus arenosi strain IHB B 7171 under pH 5–8, PEG 6000 10% and 2.5% NaCl. TCP, Al–P and Fe–P solubilization (a–c), siderophore production (d), IAA-like auxins production (e), and ACC-deaminase activity (f). Values are the mean of three replicates. Scale-bars represent activity levels