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Nitrogen added to plants either as ammonium or nitrate ion results inincreases in amounts of both proteins and amino-acids and usually also in theamides asparagine and glutamine. However, evidence is accumulating whichsuggests that differences in metabolism occur according as the plants are providedwith either ammonium salts or nitrates.

Studies on The Nitrogen Metabolism of Plants VII. Toxicity of Some Oximes and Oximino·Acids to Azotobacter and Their Utilization