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Published online 1 September 1975
Published in Agron J 67:842-844 (1975)
© 1975 American Society of Agronomy
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Soybean Root Anatomy as Influenced by Soil Bulk Density1

V. C. Baligar, V. E. Nash, M. L. Hare and J. A. Price, Jr.2

This research was conducted under controlled greenhouse conditions to investigate the effects of soil compaction on soybean (Glycine max L.) root antomy. Previous research has shown that high soil compaction reduces root efficiency in moving air, water, and nutrients into the plant.

Increasing bulk density from 1.65 to 1.95 g/cm3 altered the root anatomy. In the high density soil layers a larger percentage of the root volume was occupied by cell wall material, and the transverse sections of the roots had a wavy outline with ruptured epidermal cells. The vascular cylinder became more oval with a gradual increase in both casparian thickening in the endodermis and wall thickening in the xylem vessels.

Key Words: Soil compaction • Cortex • Parenchyma • Epidermis • Endodermis • Xylem • Casparian strips

1 Contribution from the Dep. of Agron., Miss. Agric. and For. Exp. Stn., and Dep. of Botany, Miss. State Univ., Mississippi State, MS 39762. Approved by the director as journal no. 3071.

2 Graduate research assistant, agronomist, associate professor of botany, and assistant professor of botany, respectively.

Received for publication May 12, 1975.




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Copyright © 1975 by the American Society of Agronomy.