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Variations in specific root length (A) and specific root area (B) of durum wheat fertilized with rock P in response to inoculation with five PSB isolates versus P (RP and TSP) treatments alone harvested at 42-day after germination. Error bars represent the standard deviation of four replicates and each replicate consists of eight wheat plants per pot. Mean values labeled with the same letter were not significantly different at p < 0.05.
