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Influence of Unfilled Cotton Seed upon Emergence and Vigor¹

The influence of cottonseed fullness upon emergence and seedling growth was studied under a minimal temperature of 17 C ± 1. Seeds of Acala SJ-1 (Gossypium hirsutum L.) were sorted by X-ray photography into four classes, or degrees of seed filling (50, 75, 90, and 100%).

Completely filled seeds were superior to partially filled seeds for total emergence, seedling survival, and early growth. Emergence and seedling survival were related more to seed fullness than to seed weight in this study. These data indicate that grading of planting seed based upon weight or size is not adequate to remove many inferior seeds.

Key Words: Seed classes • X-ray photograph • Seedling survival • Gossypium hirsutum

² Agronomy Research Assistant and Research Agronomist, respectively, Plant Science Research Division, Agricultural Research Service, US Department of Agriculture, US Cotton Research Station, Shatter, Calif. 93263.

Received for publication March 19, 1971.