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Moisture Migration into Soybean Pods¹

An evaluation of moisture absorption by soybean [Glycine max (L.) Merr.] pods was conducted in 1978 and 1979. Forty-six cultivars representing Maturity Groups II through VI were grown to harvest maturity in the field. Representative plants from each cultivar were taken to the laboratory and intact pods were removed from each plant. In each year, two sets of 20 pods from each cultivar were submerged in water for 0, 1, 6, and 24 hours to allow moisture uptake by the pod and seed.

Pods and seeds from cultivars in Maturity Groups II through IV absorbed significantly more moisture than those from Maturity Groups V and VI. Pods of ‘Williams’ and #x2018;Celest’ absorbed the least amount of moisture in Maturity Groups III and V, with both having absorbed approximately 78.0 g H₂O/100 g dry wt at 24 hours. Water uptake in these two cultivars were significantly different from the cultivars that absorbed the most water within their respective maturity groups. Seed of ‘Perry’ and ‘Ware’ absorbed the least moisture of the 16 cultivars in Maturity Group IV.

Key Words: Glycine max (L.) Merrill • Seed deterioration

² Plant physiologist, Seed Research Laboratory, and plant geneticist. Cell Culture and Nitrogen Fixation Laboratory, AR, SEA, USDA, Beltsville, MD 20705.

Received for publication February 26, 1981.