SSSAJ Journal of Natural Resources and Life Sciences Education
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Published in Soil Sci Soc Am J 31:565-568 (1967)
© 1967 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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The Establishment and Growth of Loblolly Pine Seedlings on Compacted Soils1

R. Rodney Foil and C. W. Ralston2

ABSTRACT

Loblolly pine (Pinus taeda L.) seedlings were grown from seed on core samples collected from surface soils of Lakeland loamy sand, Coxville loam, and Bayboro clay that had been compacted, puddled, or loosened. Seed germination was not affected by soil type or treatment, but seedlings became established with difficulty on clay cores and on heavily compacted cores of lighter texture. Top height and root length were not related to soil type, but seedlings grown on clay were significantly lighter than the other groups. Loosening the soil from its normal structure reduced growth on light-textured soils, but stimulated it on clay soils. Compaction, whether at 3.5 or 10.5 kg cm-2 of surface pressure, greatly reduced seedling size and weight. Small growth differences between compaction treatments indicated that even the smallest pressure applied reduced soil aeration and increased mechanical impedance to root growth to infavorable levels. There were negative linear relationships between root weight and penetration and densities ranging from 0.8 to 1.4 g cm-3.

Key Words: aeration • root growth

NOTES

1 Presented before Div. S-7, Soil Science Society of America at Columbus, Ohio, Nov. 2, 1965. This study was supported in part by the Southeastern Forest Exp. Sta., U.S.D.A., Asheville, N.C.

2 Associate Specialist (Forestry), Louisiana Coop. Ext. Service, Baton Rouge, La., and Professor of Forest Soils, Duke Univ., Durham, N. C. Work reported here was done while the senior author was on the staff of the North Louisiana Hill Farm Exp. Sta., Homer, La.

Received for publication September 1, 1966. Accepted for publication April 11, 1967.






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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 © 1967 by the Soil Science Society of America.