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Soil carbon and nitrogen were determined by a LECO CHN-600 determinator; precision and rate of analysis by the new method were compared with those by two other methods. Precision of total carbon data as expressed by the range of standard deviations of seven values for each of 10 samples with carbon contents of 0.1–11% were: CHN-600, 0.01–0.13; LECO induction furnace 0.02–0.86; and wet oxidation 0.04–0.96 Standard deviations of nitrogen data by the CHN-600 ranged from < 0.01 to 0.02 for samples with total nitrogen of 0.01–0.95%. Rate of determination of carbon and nitrogen by the CHN-600 was more than double that of either of the other carbon methods combined with nitrogen by Kjeldahl. Key words: Soil, carbon, nitrogen, precision, rate of analysis
B. Sheldrick (Fri,) studied this question.