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Effect of Nitrogen and Potassium Fertilization on Organic Acids of Bromus Inermis L. and Dactylis Glomerata L.¹

The effect of nitrogen and potassium fertilization on the organic acids of Dactylis glomerata L. (orchardgrass) and Bromus inermis L. (bromegrass) was characterized from initiation of spring growth to maturity.

Nitrogen fertilization significantly increased malic, trans-aconitic, and citric acids in bromegrass and citric acid in orchardgrass, but significantly decreased shikimic and quinic acids in both species. Potassium significantly reduced levels of malic, quinic, and shikimic acids in both species and trans-aconitic acid in bromegrass. No effect of K on citric acid concentration was noted. Citric, shikimic, and quinic acid concentrations declined with increasing maturity, while the levds of the predominant organic acids (malic and trans-aconitic) remained constant

Key Words: Seasonal variation • Trans-aconitic acid • Malic acid • Citric acid • Shikimic acid • Quinic acid

² Assistant Professor of Agronmny, Ohio Agricultural Research and Development Center, Wooster, Ohio 44691.

Received for publication May 12, 1972.

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