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This article in AJ

  1. Vol. 70 No. 1, p. 47-50
    Received: Nov 22, 1976

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Seasonal Log of the Flowering and Podding Activity of Field-grown Soybeans1

  1. Wayne R. Hansen and
  2. Richard Shibles2



Little is known about the seasonal and nodal distributions of flowering and podding in soybeans (Glycine max (L.) Merr.). This study was initiated to determine the fruiting activities of two Midwestern cultivars (‘Hark’ and ‘Hawkeye’). They were planted in 102-cm rows on 18 May at Ames, Iowa, and thinned to appropriate spacings after emergence. Ten plants, spaced equidistant within a row of each of the four replications, were tagged for logging. Pods present at harvest maturity represented 37% of flowers produced in both cultivars. Thirty-five and 40% of the flowers, and 44 and 40% of the pods abscised in Hawkeye and Hark, respectively. Proportionately greater loss of reproductive structures occurred on branches and on lower main stem nodes in both cultivars. Above node 6 the percentage pod set was virtually constant. Flowering, podding, and seed production were greatest in the lower middle portions of the plant — nodes 6 to 15 on plants with 22 to 26 nodes per main stem. Although flowering differed on a per plant basis, on a land area basis flowering, number of seeds produced, and yield were virtually identical for the two cultivars.

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