Isolates Nitrite content (mg N/L) Isolates Nitrite content (mg N/L) Isolates Nitrite content (mg N/L) Rhizobium 4R 0.05 Rhizobium PS2 5 Azotobacter P11 12.73 Rhizobium A3 11.52 Rhizobium A1 13.15 Azotobacter P81 0.05 Rhizobium 6R 6.36 Rhizobium Sin1 0.26 Azotobacter A1 0.1 Rhizobium A4 5.68 Rhizobium D1 0.1 Azotobacter D1 13.42 Rhizobium A2A 3.78 Rhizobium 1R 1.89 Azotobacter D2 0 Rhizobium A2B 10.1 Rhizobium 2R 11.36 Azotobacter PHB+ 14.82

Table 1: Comparative evaluation of nitrate reduction by different strains of Rhizobium , Azotobacter.