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Growth and Nutrient Uptake by Soybean Plants in Nutrient Solutions of Graded Concentrations

Maurice H. Frere^b

^a Mineral Nutrition Laboratory, ^b United States Soils Laboratory, Soil and Water Conservation Research Division, Agriculture Research Service, United States Department of Agriculture, Beltsville, Maryland 20705

Soybean plants (Glycine max L. Merr. var. Hawkeye), grown in nutrient solutions maintained at graded concentrations showed a large response in both shoot dry weight and total ion uptake. Growth rate was dependent upon nutrient concentration, even when quantity of nutrient was not limiting. Peak periods for absorption of specific ions at certain growth stages were not exhibited. Rates of ion uptake by soybeans were generally proportional to the growth rate during the period of major growth. It is suggested that a dilute nutrient solution could provide sufficient nutrients for adequate root growth prior to major shoot growth, at which time a more concentrated nutrient solution is needed.

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