Simultaneous determination of nitrogen, phosphorus and potassium in plant material by automatic methods

Existing methods, using autoanalyser and flame photometer equipment have been adapted and combined. Using one acid digest of plant material, three determinations, for nitrogen, phosphorus and potassiums are carried out simultaneously and automatically. Seventy samples per hour can be assayed. Time and mental fatigue in calculating results are reduced by using a two‐way table produced as a computer print‐out.