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Phosphorus Uptake from Soils by Corn Hybrids selected for High and Low Phosphorus Accumulation¹

Field, greenhouse, and laboratory experiments were conducted over a period of 4 years to relate P accumulations in ear leaves of different corn hybrids and other plant responses to addition of P to soils and root morphology, including the length of the radicle, diameter of the radicle, and the number of seminal roots produced after 4 days in an incubator of high relative humidity at 28 C. In addition, experiments were conducted to determine the relationship of P accumulation in ear leaves and grain yields to P concentrations in seedling plants, seedling growth rate and P uptake from a zone 25 an (10 inches) below the soil surface.

It was concluded that the concentration of P in seedling plants can be used to predict the availability of P in the soil. The concentrations of P accumulated in ear leaves by the different hybrids could not be explained on the basis of the P-absorption characteristics of their roots, but inherent differences among hybrids with respect to depth of rooting was suggested.

Key Words: Depth of rooting • Plant analysis • Radicle morphology

² Associate Professor of Soil Technolo Soils Research Aides, and Professor of Agronom The Pennsyiania State University.

Received for publication July 22, 1969.