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This article in AJ

  1. Vol. 62 No. 5, p. 581-584
     
    Received: Jan 22, 1970


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doi:10.2134/agronj1970.00021962006200050009x

Rooting Systems of Soybeans. I Differences in Root Morphology among Varieties1

  1. C. D. Raper and
  2. S. A. Barber2

Abstract

Abstract

Field experiments were conducted to delineate morphological differences among root systems of 26 soybean varieties (Glycine max (L) Merr.). ‘Aoda’ and ‘Harosoy 63,’ were selected from the 26 varieties and strains as representative of extremes in rooting patterns.

A core sampling technique was used to quantitatively analyze the rooting systems iu single-plant plots. Harosoy 63 had a more extensive root system, including a nearly two fold greater root surface area, than Aoda. The rooting morphologiyn single-plant and row plots was studied qualitatively by a soil monolith method. Both varieties lacked a distinctive taproot development below a zone of profuse branching. The disposition of primary branches in the soil was apparently influenced by intraspecific competition

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