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  1. Vol. 10 No. 4, p. 419-422
     
    Received: Feb 12, 1970
    Published: July, 1970


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doi:10.2135/cropsci1970.0011183X001000040032x

Yield Reduction in Safflower Hybrids Caused by Female Selfs1

  1. A. L. Urie and
  2. D. E. Zimmer2

Abstract

Abstract

Fl hybrids of safflower, Carthamus tinctorius L., when grown in comparative yield trials with adapted varieties, outyielded ‘Ute,’ the highest yielding variety, by an average of 24%. Hybrids mixed with 16 to 43% female selfs (partial hybrids) failed to show the same superiority. Normal-hull varieties containing mixtures of from 10 to 60% thin-hull (females) failed to yield as much as the same varieties without the mixtures. As the percentage of thin-hull plants increased in the mixture the yield decreased. Unless the competition resulting from the presence of low-yielding selfs can be avoided, eliminated, or reduced, the maximum potential yield afforded by hybrids may not be realized.

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