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Field Performance of Cotton Grown from Filled and Partially Filled Seeds¹

The influence of seed fullness (degree to which kernels fill the space within the seed coat) upon emergence, vigor, maturity, and yield of cotton (Gossypiun hirsutum L.) was studied under field conditions in 1971. Each of four lots of ‘Acala SJ-1’ cottonseed, was sorted by X-ray inspection into three classes: check (or unsorted), full, and partially filled seed.

Plants from filled seeds were superior to those from partially filled seeds for all emergence and vigor measurements. Plants from the filled class were also superior to those of the check seeds for vigor as measured by dry weight accumulation during 8 weeks of seedling growth.

An earlier-maturing cotton was produced from plants grown from filled seeds as measured by blooming rate and by first picking weights.

The four lots of seeds differed significantly for emergence rate and final number of plants, but no significant differences among lots could be detected for seedling vigor and maturity. No significant lot x class interactions were found.

No significant differences for final yield were detected, but in each of the four lots the mean yields were highest for the full seed class.

A general advantage in emergence, seedling vigor, and crop maturity was indicated for the full seed. Thus, cotton planting seeds that are completely filled should be desirable for obtaining and maintaining a stand of healthy seedlings and for earlier fruit production.

Key Words: Seed classes • Seed lots • Emergence • Seedling vigor • Maturity • Blooming rate • Seed cotton yield

² Research Agronomist and Agronomy Research Assistant, respectively, PSRD, ARS, USDA, U.S. Cotton Research Station, Shafter, Calif. 93263.

Received for publication May 19, 1972.