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This article in AJ

  1. Vol. 65 No. 3, p. 440-441
    Received: July 10, 1972

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Effect of Seed Maturation and Plant Population on Soybean Seed Quality1

  1. J. S. Burris2



Soybean (Glycine max (L.) Merr.) seed producers have shown a renewed interest in the premature defoliation of seed fields to facilitate earlier dry-down and efficient harvest. This interest prompted this study on the effects of seed maturation (days after flowering) on seed quality. Four cultivars of soybeans were grown at 4 and 8 plants/ 30 cm rows in rows 75 cm apart. Individual flower nodes were identified at flowering. Pods were removed 30, 40, 50, and 60 days after flowering and allowed to air dry in the laboratory. The hand shelled seed was used to determine wt/100 seed, germination percentage, shoot and root dry matter, and cotyledonary weight remaining at the end of the seven-day growth period. Seed size increased linearly with increased time after flowering. The low population produced significantly smaller seed than the high population. Germination percentages increased with increasing time after flowering, although the varieties Amsoy and Corsoy exhibited a reduction in germination between 30 and 40 days, primarily accounted for by an increase in the hard seed percentage. Shoot and root growth increased with increased time after flowering. Shoot growth was greatest and root growth was least in the high population.

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