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Effects of Vigor of S 1 Lines and Seeding Rates on Yield and Final Stand of an Alfalfa Two‐Clone Combination Admixed with Different Percentages of S 1 Seed 1
Author(s) -
Carnahan H. L.,
Paden R. N.
Publication year - 1967
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1967.0011183x000700010004x
Subject(s) - biology , clone (java method) , selfing , seeding , yield (engineering) , hybrid , forage , serial dilution , dilution , botany , horticulture , agronomy , genetics , medicine , population , demography , materials science , alternative medicine , pathology , sociology , metallurgy , dna , physics , thermodynamics
An alfalfa 2‐clone F 1 combination was admixed with each of 5 S 1 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 S 1 lines contributed to a significant dilution ✕ S l '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 S 1 plots. We concluded that yield of a 2‐clone combination is dependent upon (a) yield of the hybrid; (b) yield of the S l '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.