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Root Respiration of Tobacco, Corn, and Cotton Plants¹

Synopsis: The respiration rates of tobacco, corn, and cotton roots undergo daily fluctuations with the maximum rate generally occurring about 4 p.m. Root weight appears to be the primary factor influencing the amount of respiration under favorable aeration conditions. However, the concentrations of CO₂ and O₂ in the root atmosphere influence the respiration rate.

² Graduate Assistant and Associate Professor of Soils, respectively.

Received for publication January 12, 1956.

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