Fig. 3From: Improving fertilizer-depot exploitation and maize growth by inoculation with plant growth-promoting bacteria: from lab to fieldRoot surface pH within (a, c) or outside (b) the NH4-Depot or corresponding soil zone (Rhizobox). NO3-Mixed Ca(NO3)2 homogenously mixed in substrate, NH4-Depot stabilized (NH4)2SO4 placed in substrate as a depot, BE bio-effector, NoBE no bio-effector, BE1 Pseudomonas sp. DSMZ 13134Back to article page