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This article in CS

  1. Vol. 17 No. 5, p. 769-772
     
    Received: Sept 7, 1976
    Published: Sept, 1977


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doi:10.2135/cropsci1977.0011183X001700050023x

Seed Setting Efficiency in Eight Cultivars of Upland Cotton1

  1. John H. Turner,
  2. J. McD. Stewart,
  3. P. E. Hoskinson and
  4. H. H. Ramey2

Abstract

Abstract

Seed setting efficiency was determined for six cultivars of Upland cotton (Gossypium hirsutum L.) in 1974 and eight cultivars in 1975 at Jackson, Tenn. The number of ovules per ovary was determined by examining blooms at weekly periods. Simultaneously tagged blooms provided identifiable bolls from each bloom period to determine the number of seeds per boll. Seed setting efficiency (S.S.E.) was calculated from: (seeds/boll ÷ ovules/ovary) in percent

Cultivars differed in ovules/ovary, seeds/boll, and S.S.E. both years. The influence of bloom periods, although significant for ovules/ovary both years, was less than cultivar influence. S.S.E. was also influenced by bloom period in 1974, with lower efficiency at the late bloom period. Cultivar ✕ period interactions were detected for ovules/ovary and seeds/boll in 1974 and for ovules/ovary in 1975.

The combined analysis with six of the cultivars show that cultivars influenced ovules/ovary and seeds/boll far more than years or period of bloom. Year ✕ cultivar and year ✕ period interactions obscured the main effects upon seed setting efficiency.

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