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Photoperiodic Alteration of Dry Matter Partitioning and Seed Yield in Soybeans¹

Soybeans [Glycine max (L) Merr. ‘Ramsom’] were grown in controlled environment rooms to evaluate the effects of photoperiod during the seed-fill period on dry motter partitioning and seed yield at maturity. Plants were grown in sand culture with a complete trient solution and at day/night temperatures of 22/18, 26/22, and 30/26 C. Initially, plants were grown under non-inductive long-day photoperiods. At the sixth node stage of development, the plants were moved to inductive short-day photoperiods for 25 days until the beginning of podfill. Four plants at each temperature were then returned to the long-day photoperiod until full pod maturity and four were retained under the short-day period until maturity. At all temperatures, the ratio of vegetative to reproductive weight at full pod maturity was increased under the long-day photoperiod. Pod weight was unaffected by photoperiod but seed weight and total seed yield were restricted by the long-day photoperiod at the two higher temperatures. However, seed size and yield were greater for the long-day photoperiod at the 22/18 C temperatures.

Key Words: Glycine max (L.) Merr. • Seed size • Source-sink relationships

² Associate professor and visiting assistant professor, Dep. of Soil Science, North Carolina State University, Raleigh, NC 27607.

Received for publication October 1, 1977.