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Published in Crop Sci 19:41-46 (1979)
© 1979 Crop Science Society of America
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Regression Equations for Rate of Soybean Hypocotyl Elongation by Using Field Data1

K. H. Knittle, J. S. Burris and D. C. Erbach2

To identify limiting factors for soybean (Glycine max (L.) Merr.) hypocotyl elongation rate under field conditions, regression equations were obtained from data collected entirely in the field for cultivar ‘Wayne’. Seedling samples were excavated, and hypocotyl lengths were measured periodically from early seedling growth until 50% emergence. Soil factors measured were temperature, moisture percentage, and resistance. A soil cone penetrometer for measuring soil resistance was developed. Soil moisture percentage and temperature were used as independent variables in a predictive equation for hypocotyl elongation rate during seed germination and initial stages of hypocotyl elongation. Subsequent (> 1 cm) hypocotyl elongation was predicted with soil resistance, temperature and hypocotyl length as independent variables. The identification of soil resistance as a significant factor affecting hypocotyl growth under field conditions explained differences between the equations developed in this study and those obtained previously in a minimal resistance medium.

Key Words: Soil resistance • Soil temperature • Soil moisture • Growth models • Glycine max

1 Journal Paper No. J-9122 of the Iowa Agric. and Home Econ. Exp. Stn., Ames, Iowa. Project 2191.

2 Former graduate research assistant (presently research statistician, Pfizer Genetics, Inc., 1000 Executive Parkway, St. Louis, MO 63141) and professor, Dep. of Botany and Plant Pathology, and associate professor, ARS, USDA. Dep. Agricultural Engineering, Iowa State Univ., Ames, IA 50011.

Received for publication April 17, 1978.




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