Abstract
An adaptation of photometric analytical procedures to expressed plant juice, including total soluble N, the nitrate, ammonia, a amino, glutamine, and asparagine fractions; and total sugars, reducing sugars, and non-sugar reducing substances. Except for the nitrate and sugar detns., the procedures are also applicable to alcohol or water extracts of plants. All N fractions except nitrates are converted to NH3 and measured by Nesslerization.