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Enterobacteriaceae are nitrate +. Don't know about Pseudomonas, though.
fertiliser usage.
Potassium nitrate is KNO3. There is one potassium per one nitrate. One mole of potassium nitrate contains one mole of nitrate.
Silver nitrate is a compound. It consists of the metal silver and the compound nitrate. Nitrate consists of nitrogen and oxygen.