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The Influence of Fertilizers on the Production and Quality of Peppermint in Central Washington¹

Sypnosis: Oil quality and yield of peppermint were related to the plant nutrient status. Nitrogen, P, K, and S produced in that order decreasing influences on oil and hay yield. Menthol content of oil, especialIy in 1953, was decreased in those plants with increased nitrogen content, whereas menthofuran was increased. Leaf N was slightly more effective than leaf P in predicting menthol content and three times as effective in predicting menthofuran content. Menthol and menthofuran accounted for 76% of the variation in optical rotation of the oils in 1953. Menthol was more important in determining optical rotation in 1953.

² Formerly Research Assistant, State College of Washington, now serving in the United States Navy. The author wishes to express appreciation to Dr. L. W. Rasmussen, Dr. H. M. Reisenauer, and Dr. S. C. Vandecaveye for their direction in completing this study; also to J. W. Elliott, James Cleary and D. W. Ingalsbe of the Agricultural Chemistry Department, Washington Agr. Exp. Sta. for determining the physical constants of the peppermint oil samples, and the A. M. Todd Company and the Beech-Nut Packing Company for financial support.

Received for publication September 22, 1956.