Application of Kjeldahl and Dumas Micro Methods to Pasture Nitrogen Determination.

By F. B. Thompson and E. P. White, Research Station, Hamilton.

A semi-micro Kjeldahl method for total nitrogen determinations in pasture was described. On some samples the method gave extremely high figures (5.5—6.5 per cent. N.). Check determinations by the standard Dumbs micro-method and a “tapping” modification both gave lower but erratic results. Another modification repeating the combustion in oxygen, gave consistent figures in agreement with those from the Kjeldahl method. The modified Dumbs method is unsuitable for routine analysis.