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Influence of CO₂ on Growth of Corn and Soybean Seedlings¹

ABSTRACT

Pregerminated corn and soybeans were grown at near-constant moisture suction in soil contained in plastic cells. The cells were constructed to permit differential aeration of either tops and roots separately, or the two together. Silicone rubber or wax on the soil surface separated top and root atmospheres. Gas mixtures of known concentrations of CO₂, O₂, and N₂, were used for continuous forced aeration. Measurements and observations of various aspects of plant growth showed that both plant species were tolerant of high CO₂ concentrations. Plants grew satisfactorily for several days when tops, roots, or both received 20% or more of CO₂; lesser CO₂ concentrations often stimulated top and root growth as compared with air treatment.

¹ Joint contribution from the Soil and Water Conservation Research Division, ARS, USDA, and Department of Agronomy, Colorado Agr. Exp. Sta., Fort Collins. This work was supported in part by Western Regional Research Project, W-67, and is part of a thesis submitted by the senior author in partial fulfillment of the requirements for the Ph.D. degree. Presented before Div. C-2, American Society of Agronomy, Denver, Colo., Nov. 20, 1963. Colorado Agr. Exp. Sta. Scientific Journal Series 980.

² Soil Scientist, USDA, Grand Junction, and Professor of Agronomy (Soils), Colorado State University, Fort Collins, respectively.

Received for publication October 2, 1964. Accepted for publication February 3, 1965.