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A Micro-Digestion Procedure for the Determination of Aminoid Nitrogen in Plant Material¹

Plant material from two brush species, Ceanothus crassifolius and Adenostoma fasciculatum, was analyzed for aminoid N content using three different digestion procedures. A micro-digestion procedure in a sealed tube gave higher organic nitrogen recovery than two standard Kjeldahl digestion methods. Partial recovery of nitrate N was found when standard digestion procedures were used, but no nitrate N recovery was apparent from the sealed tube method.

Key Words: standard Kjeldahl digestion • nitrate N recovery • sealed tube • organic nitrogen recovery

² Research Associate, Department of Agricultural Chemistry and Soils, (now Assistant Professor of Hydrology and Water Resources) University of Arizona, Tucson.

Received for publication March 13, 1967.