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Published online 1 January 1968
Published in Agron J 60:59-61 (1968)
© 1968 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Vernonia anthelmintica: A Potential Seed Oil Source of Epoxy Acid. II. Effects of Cultural Practices, Seed Maturity, and After-ripening Conditions on Germination1

J. J. Higgins and G. A. White2

Germination studies with seed of Vernonia anthelmintica (L.) Willd., a potential new oilseed crop source of epoxy acid, were conducted at Glenn Dale, Md., during the period 1963-1967. The influence of planting and harvesting dates and seed storage conditions on germination was considered. Results show that a post-harvest period for after-ripening is required before good germination can be obtained. The length of the period will vary with the season but storage at room or air temperatures for 16 to 18 weeks or longer is suggested before the seed is placed, in cold storage or used for planting purposes. Cold storage of seed was unfavorable to the after-ripening process since germination proccded more slowly than for seed stored at room temperature. Planting and harvesting dates were of importance primarily as they influenced seed maturity and the period of time from harvest to germination or to subjection of seed to storage conditions. Seed harvested from frost-killed plants germinated poorly. Seed from early harvests was less mature and required a longer after-ripening period than seed form later harvests.

Key Words: fruit development stages • planting dates • harvest dates • oilseed crop • storage

1 Contributions of the Crops Research Division, Agricultural Research~Service, USDA.

2 Research Plant Physiologist and Research Agronomist, U.S. Plant Introduction Station, Glenn Dale, Md.20769, and Beltsville, Md., 20705, respectively. The authors gratefully acknowledge the assistance of E. J. Koch, Biometrical Services, ARS, USDA.

Received for publication June 22, 1967.




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Copyright © 1968 by the American Society of Agronomy.