NaNO3                                     2.00      g
MgSO4. 7H2O                            0.50      g
KCl                                           0.50      g   
Fe2(SO4)3. H2O                        0.01      g
KH2PO4                                    0.14      g
K2HPO4                                    1.20      g
Agar                                        15.00     g
Yeast extract                             0.02      g
Distilled water                       1000.00     ml
Adjust pH to 7.2. Place a strip of sterile filter paper on cooled agar and inoculate on filter strip.