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Rooting System of Soybeans. II. Physiological Effectiveness as Nutrient Absorption Surfaces¹

‘Aoda’ and ‘Harosoy 63’ soybeans [Glycine max (L.) Merr.], representing extremes in gross root morphology, were used in field and growth chamber experiments to study the influence of physiological characteristics of soybean roots on the absorption of nutrients. The efficiency of K uptake per unit root surface was found to be dependent on the variety and the solution concentration of K. The rate of K uptake per unit root surface, or K absorption potential, for Aoda roots was almost double that of Harosoy 63 roots at high levels of K but was nearly equal at low levels. The effect of K concentration on absorption potentials in nutrient solution was independent of concurrent variation of other nutrientions or total growth rate of the plants.

Key Words: Potassium • Calcium • Magnesium • Zinc • Nutrient solution

² Former graduate assistant and professor of Agronomy.

Received for publication January 22, 1970.