Crop Science Grow Your Career with CSSA
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

Published in Crop Sci 7:9-13 (1967)
© 1967 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Carnahan, H. L.
Right arrow Articles by Paden, R. N.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Carnahan, H. L.
Right arrow Articles by Paden, R. N.
Agricola
Right arrow Articles by Carnahan, H. L.
Right arrow Articles by Paden, R. N.

Effects of Vigor of S1 Lines and Seeding Rates on Yield and Final Stand of an Alfalfa Two-Clone Combination Admixed with Different Percentages of S1 Seed1

H. L. Carnahan and R. N. Paden2

An alfalfa 2-clone F1 combination was admixed with each of 5 S1 lines at 5 dilution percentages and seeded at 3 rates. Forage yields for a 2-year period at Reno, Nevada, indicated (a) as little as 10% selfed seed in admixtures depressed yield significantly; (b) differences in vigor of S1 lines contributed to a significant dilution x Sl's interaction; and (c) seeding rates did not interact materially with dilutions.

Final stand indicated that competition generally was more operative at higher seeding rates and in admixed populations than in either the 2-clone combination or the S1 plots. We concluded that yield of a 2-clone combination is dependent upon (a) yield of the hybrid; (b) yield of the Sl's from the parents; (c) amount of selfing that occurs in producing the seed of a 2-clone combination; and (d) the amount of compensation by the hybrid component of the combination. Theoretical advantages and disadvantages of hybrids vs. 2-clone combinations were discussed.

Key Words: breeding • heterosis • competition • admixtures • interactions • forage • inbreeding

1 Joint contribution from Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture, and Nevada Agricultural Experiment Station, with partial support from Western Regional Project W-40. Nevada Experiment Station Journal Series No. 37.

2 Research Agronomists, Crops Research Division, ARS, USDA, Reno, Nev. The senior author is now Director of Research, Arnold-Thomas Seed Service Fresno, Calif.

Received for publication April 30, 1966.




HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
The SCI Journals Agronomy Journal Vadose Zone Journal
Journal of Natural Resources
and Life Sciences Education		 Soil Science Society of America Journal
Journal of Plant Registrations Journal of
Environmental Quality		 The Plant Genome
Copyright © 1967 by the Crop Science Society of America.