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Corn Root Distribution and Moisture Extraction in Relation to Nitrogen Fertilization and Soil Properties¹

Synopsis: Root development and moisture extraction in a nitrogen-fertilized sandy soil exceeded that in unfertilized soil during early growth of the corn, but were essentially the same under both conditions at maturity. Fertilized corn was more efficient in its use of soil moisture. Restricted root development was associated with high bulk density and low nutrient availability in the substratum. Roots in unfertilized plots were associated almost exclusively with old root channels and organic materials.

² Former Graduate Assistant and Instructor in Agronomy, University of Nebraska, (now Research Associate, ARS, USDA, Cornell University), former Associate Professor of Agronomy (now Associate Soil Scientist, University of Hawaii), and former Instructor in Agronomy (now Agronomist, U.S. Steel Corporation, Salt Lake City, Utah).

Received for publication June 5, 1961.