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The Effect of Certain Nutrients Upon the Hydrocyanic Acid Content of Sudangrass Grown in Nutrient Solution¹

Synopsis: Levels of cyanide in Sweet Sudan were positively associated with levels of nitrogen in the nutrient solutions employed, and negatively associated with levels of phosphorus. There was no consistent response to potassium. Line 109, inherently low in cyanide, did not respond to any of the nutrient treatments. Levels of cyanide were higher in seedlings 20 days old than in those 15, 25, 30, or 35 days old.

² Formerly Graduate Fellow in Agronomy, University of Wisconsin, now Assistant Professor of Agronomy, College of Agriculture, Anand, Bombay State, India; and Assistant Professor of Agronomy, University of Wisconsin; respectively. The authors are indebted to H. L. Ahlgren for suggesting that this study be undertaken.

Received for publication January 16, 1958.