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

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

Key Words: Root sampling procedures • Root weight • Root length • Root surface area

² Former graduate assistant and Professor of Agronomy.

Received for publication January 22, 1970.

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