Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 1 September 1961
Published in Agron J 53:331-335 (1961)
© 1961 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Factors Affecting Seedling Emergence of Blackwell Switchgrass1

E. B. Hudspeth and H. M. Taylor2

Synopsis: Switchgrass seedlings emerged from 3 1/4 inch depth of loose soil. However, when compaction pressure or surface slaking caused drying soil to develop considerable rigidity, emergence was hindered. With static medium to high available-moisture levels, pressures of 1 psi on loose soil caused significantly greater emergence than no pressure. Greatest emergence through a depth of 1/2 inch of loose soil occurred at about 1/3 atmosphere soil moisture tension.

1 Contribution from Agricultural Engineering Research Division and Soil and Water Conservation Research Division, ARS, USDA, and the Texas Agricultural Experiment Station cooperating.

2 Agricultural Engineer and Soil Scientist, respectively. Crop Production Engineering Research Branch, AERD, and Southern Plains Branch, SWCRD, Agricultural Research Service, USDA.

Received for publication January 23, 1961.




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The SCI Journals Crop Science Vadose Zone Journal
Journal of Natural Resources
and Life Sciences Education		 Soil Science Society of America Journal
Journal of Plant Registrations Journal of
Environmental Quality		 The Plant Genome
Copyright © 1961 by the American Society of Agronomy.