Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 9:544-547 (1969)
© 1969 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Differential Seed Production of Northern Alsike and Red Clovers at Southern Latitude1

A. Dovrat and Miriam Waldman2

Almost all plants of the original and increase lots of ‘Iso’ and ‘Tammisto’ alsike clover (Trifolium hybridum L.) contributed to the seed harvests at Rehovot, Israel (approx. 32°N). Seed yields per plant and total seed production of increase lots were similar to the original in spite of a considerable increase in the varietal population of plants contributing to the early seed harvests. Very little relationship was found between early flowering and high seed yield in these two varieties of alsike clover.

About half of the plants of ‘Tepa’ and ‘Alaskland’ red clover (Trifolium pratense L.) derived from the original seed lot produced seed. Varietal populations of first and second generation increase lots of Alaskland had a higher percentage of early-flowering plants than the original seed ]tot. Varietal populations of second generation increase lots of Tepa also had a higher percentage of early flowering plants, but the first generation increase seed lots were similar to the original seed of Tepa. Total seed production of second generation increase lots of Alaskland was higher than of first generation lots. Early flowering and the contribution of seed from early-flowering plants to the total seed yield showed some relationship in Alaskland but not in Tepa.

Key Words: Genetic shift • Date of bloom • Trifolium hybridum L. • Trifolium pratense L.

1 Contribution from the Hebrew University, Faculty of Agriculture, Department of Field and Vegetable Crops, Rehovot, Israel. This work was supported by grant No. FG-Is-133 of P.L. 480 currencies from The United States Department of Agriculture.

2 Senior Lecturer and Instructor.

Received for publication August 27, 1968.




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