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Table 1 Enumeration of autochthonous free-living N2-fixing bacteria and Azotobacter chroococcum 76A in the rhizosphere of non-inoculated (C) and inoculated (I) tomato plants at the end of cultivation cycle

From: Root inoculation with Azotobacter chroococcum 76A enhances tomato plants adaptation to salt stress under low N conditions

Treatment

Free-living N2-fixing bacteria (Log CFU/g)

A. chroococcum 76A (Log CFU/g)

(C) Optimal N, 100 mM NaCl

6.83 ± 0.13c

–

(C) Optimal N, 50 mM NaCl

6.63 ± 0.30c

–

(C) Optimal N, 0 mM NaCl

6.77 ± 0.07c

–

(C) Sub-Optimal N, 100 mM NaCl

6.80 ± 0.18c

–

(C) Sub-Optimal N, 50 mM NaCl

6.66 ± 0.31c

–

(C) Sub-Optimal N, 0 mM NaCl

6.74 ± 0.24c

–

(I) Optimal N, 100 mM NaCl

6.72 ± 0.20c

7.67 ± 0.04b

(I) Optimal N, 50 mM NaCl

6.67 ± 0.18c

7.58 ± 0.06b

(I) Optimal N, 0 mM NaCl

6.81 ± 0.13c

7.59 ± 0.09b

(I) Sub-Optimal N, 100 mM NaCl

6.50 ± 0.16c

7.81 ± 0.05a

(I) Sub-Optimal N, 50 mM NaCl

6.58 ± 0.07c

7.80 ± 0.05a

(I) Sub-Optimal N, 0 mM NaCl

6.51 ± 0.15c

7.94 ± 0.08a

  1. Different letters after the values indicate significant differences (Tukey’s HDS post hoc test, P < 0.05)
  2. The values represent the means ± SD of three replicates of three independent experiments