SSSAJ Journal of Natural Resources and Life Sciences Education
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Published in Soil Sci Soc Am J 29:363-365 (1965)
© 1965 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Root Growth Through Porous Media Under Controlled Conditions II. Effect of Aeration Levels and Rigidity1

G. M. Aubertin and L. T. Kardos2

ABSTRACT

The effect of four different compositions of aeration gases on the root growth of maize seedlings (Zea mays) grown in rigid and nonrigid systems of a given pore diameter was evaluated. Best root growth of maize seedlings occurred where the aerating gas contained 10% oxygen rather than 21%. Root growth at 5% oxygen and 21% oxygen were similar but at 2.5% oxygen root growth was markedly decreased. Adverse effects of the lowest oxygen concentration were magnified when the pore system was rigid. A comparison of various root parameters indicated that root volume, root length, and root weight were all significant indexes of root response to oxygen levels and rigidity. Differences in root weight appeared to reside in differences in weight per unit length rather than in weight per unit volume.

NOTES

1 Contribution from Department of Agronomy, The Pennsylvania State University. Authorized for publication Nov. 4, 1964 as paper no. 2954 in the Journal Series of The Pennsylvania Agr. Exp. Sta. Part of a thesis submitted by the senior author in partial fulfillment of the requirements for the Ph.D. degree at The Pennsylvania State University.

2 Former Graduate Research Assistant and Professor of Soil Technology, respectively, The Pennsylvania State University.

Received for publication November 27, 1964. Accepted for publication February 15, 1965.






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The SCI Journals Agronomy Journal Crop Science
Journal of Natural Resources
and Life Sciences Education		 Vadose Zone Journal
Journal of Plant Registrations Journal of
Environmental Quality		 The Plant Genome
Copyright © 1965 by the Soil Science Society of America.