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Solution-Culture Studies of Nitrite Toxicity to Plants¹

ABSTRACT

Solution-culture studies of the toxicity of nitrites to plants were undertaken, using several rapidly growing species as indicator plants. Three to four weeks' growth of the test plants in complete nutrient solutions containing graded amounts of nitrous acid (varying nitrite and pH levels) disclosed that growth inhibition in the pH 4.0, 5.0, and 6.0 solutions was related to the undissociated nitrous acid fraction. Experiments with tomato plants suggested that a given concentration of nitrous acid is less injurious to the plant when the nitrogen assimilable by the plant is supplied as nitrate rather than as ammonium.

¹ Paper No. 797, University of California Citrus Exp. Sta., Riverside, Calif. Presented before Div. IV, Soil Science Society of America, Dallas, Tex., Nov. 20, 1953.

² Asistant Chemist, Professor of Soils and Plant Nutrition, and Laboratory Technician, respectively, Department of Soils and Plant Nutrition, University of California Citrus Exp. Sta., Riverside.

Received for publication December 29, 1953.