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Temperature-Induced Inhibition of Soybean Hypocotyl Elongation and Seedling Emergence¹

The effect of temperature on hypocotyl elongation and seedling emergence of soybean [Glycine max (L.) Merr] varieties was studied under laboratory and field conditions. Hypocotyl elongation of darkgrown ‘Ford’ seedlings was severely inhibited at 25 C, but was normal at 15, 20, and 30 C. Hypocotyl elongation of ‘Hawkeye’ was normal at all four temepratures. Twenty-five varieties were classified according to their ability to emerge from 10 cm of sand at 25 C. Distinct varietal differences in emergence ability were evident and appeared to be genetically controlled. Instances of erratic emergence of soybean plantings may be partially explained on the basis of depth of planting, variety, and soil temepratures during the germination period.

Key Words: Field emergence • Stand establishment

² Formerly Associate Professor (now Professor, Farm Crops Department, Oregon State University); and formerly Research Associate (now Extension Agronomist, Texas A & M University): Iowa State University.

Received for publication October 10, 1968.