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Hot Water Immersion Effective for Scarifying Seeds of Tephrosia vogelii¹

Immersion in hot water baths at 50 to 56 C for 5 to 30 minutes significantly increased the germination percentage of seeds of Tephrosia vogelii as compared to tapwater soaks and mechanical scarification. Immersion for 5 minutes at 54 C induced 96% germination with a minimum of seed swelling. Thiram fungicide, when added to the hot water bath, applied as a cool slurry after hot water immersion or applied as a dust to seeds cooled and dried after hot water immersion, had no deleterious effects on seed germination.

Key Words: seed scarification of Tephrosia vogelii • hot water soak

² Plant Pathologist (present address: Box 858, Mesa, Arizona); Agronomist, Crops Research Division, ARS, USDA, Federal Experiment Station, Mayaguez, P. R.; and Plant Geneticist (present address: Plant Industry Station, Beltsville, Md.), respectively.

Received for publication October 26, 1966.