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Articles

Nitrate Absorption by Barley

I. Kinetics and Energetics ¹

^a Department of Agronomy and Range Science, University of California, Davis, California 95616

The absorption of NO₃^– by barley (Hordeum vulgare L.) was investigated by following the disappearance of NO₃^–. The absorption was related to several parameters: NO₃^– and Ca²⁺ concentrations, pH, and the presence of various anions. Absorption rate increased with increasing Ca²⁺ concentration, reaching a maximum at approximately 5 mM Ca²⁺, and was considerably inhibited by NH₄⁺. Absorption was influenced markedly by pH, and little or not at all by anions (Cl^–, Br^–, SO₄^2–), and was decreased by respiratory and oxidative phosphorylation inhibitors.

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