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Rhizo-Deposition of Organic Debris in Soil¹

ABSTRACT

Deposition of organic debris from or associated with plant roots during periods of active growth (Rhizo-deposition) was measured by the use of carbon-14. The measurements were made by growing plants from the seedling stage to near maturity in an atmosphere containing carbon-14, harvesting the tops and roots and determining the tracer C residual in the soil. The magnitudes of rhizo-deposition were directly related to the extent of root growth and ranged from 25 to 49 g residual organic debris for each 100 grains of harvested roots.

¹ Paper no. 2556 of the Journal Series of the North Carolina State University Agr. Exp. Sta., Raleigh.

² Formerly Graduate Assistants and Professor of Soil Science, North Carolina State University. Dr. Shamoot is now Head of the Soil Department, National Research Authority, Jordan. Dr. McDonald is Director of the Tobacco Research Board of Rhodesia, Salisbury, Rhodesia.

Received for publication April 15, 1968. Accepted for publication July 3, 1968.