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Growth, Yield, and Water Absorption of Tobacco Plants as Affected by the Composition of the Root Atmosphere¹

Synopsis: The roots of tobacco plants were subjected to a wide range of simulated aeration conditions. In general plant functions were not appreciably reduced until the CO₂ concentration became greater than the O₂ concentration but were sharply reduced after the CO₂ to O₂ ratio became larger than one.

² Graduate Assistant and Associate Professor of Soils, respectively.

Received for publication January 12, 1956.