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  1. Vol. 7 No. 1, p. 9-13
     
    Received: Apr 30, 1966
    Published: Jan, 1967


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doi:10.2135/cropsci1967.0011183X000700010004x

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

  1. H. L. Carnahan and
  2. R. N. Paden2

Abstract

Abstract

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 ✕ 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.

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