Fig. 4From: Impact of nitrogen fertilizer sustainability on corn crop yield: the role of beneficial microbial inoculation interactionsNitrate (NO3−), ammonium (NH4+), inorganic (NO3− + NH4+) in straw (A) and soil (B) and total N concentrations in straw (C) and soil (D) affected by inoculations. Ctl = control, Azo = single inoculation with A. brasilense, Bac = single inoculation with B. subtilis and Azo + Bac = co-inoculation with A brasilense and B. subtilis; ± refers to standard deviation of the meanBack to article page