NPK Industries Raw Nitrogen Growth 2oz Ammonium Sulfate Soluable Supplement RAW Nitrogen contains 20% ammonium nitrogen (N) in a water soluble form. RAW Nitrogen does not contain nitrates or urea which enables it to be applied at all stages of growth and bloom. Plants take up two forms of nitrogen: nitrate N and ammonium nitrate. Raw Nitrogen is ammonium nitrogen only. It can also be used as a foliar feed and during bloom unlike Nitrate (N).