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This article in AJ

  1. Vol. 70 No. 6, p. 1105-1107
     
    Received: Mar 31, 1978
    Published: Nov, 1978


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doi:10.2134/agronj1978.00021962007000060051x

Soybean Root Growth during the Reproductive Stages of Development1

  1. T. C. Kaspar,
  2. C. D. Stanley and
  3. H. M. Taylor2

Abstract

Abstract

Controversy exists concerning photosynthate sink relationships associated with seed development and their effects on soybean (Glycine max (L.) Merr.) root development. Seven cultivars were studied in the Ames rhizotron (root observation laboratory) to determine the rate which each cultivar increases its rooting depth during flowering and seed development. Depth of rooting and stage of development were measured three times a week from 16 June to 30 Aug. 1976. Rooting depth continued to increase until the maximum depth of each rhizotron compartment (217 cm) was reached. Some root growth occurred until physiological maturity (R 7). The maximum rate of downward root growth occurred during early flowering (R1 to R3) for all seven cultivars. Cultivars differed significantly in the rate of downward growth during the periods between planting and growth stage R1, R1 and R2, and R5 and R6. The cultivar ‘Hawkeye’ had the greatest rate of downward growth (8.1 cm/day) between the R1 and the R2 stages, and ‘Beeson’ had the greatest overall rate (2.8 cm/day).

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