SSSAJ Journal of Natural Resources and Life Sciences Education
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Published in Soil Sci Soc Am J 27:299-301 (1963)
© 1963 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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The Effect of Gamma Radiation on the Availability of Nitrogen and Phosphorus in Soil1

Charles F. Eno and Hugh Popenoe2

ABSTRACT

The effects of several levels of gamma radiation ranging from 0 to 2,048 kiloroentgens on the availability of N and P from three fine sands and one peat soil were investigated. Nutrient release was measured chemically and by plant uptake. Irradiation increased the availability of N and P in soils evaluated immediately following irradiation, and after 2 weeks of incubation. This was shown by both chemical and plant uptake measurements. The release of N and P was closely related to soil type and more particularly to its organic matter content. In each case the soil containing the largest amount of organic matter showed the largest increase in extractable N and P after irradiation. An evaluation of the ammonium acetate (pH 4.8) extractable Ca, Mg, and K data indicated that there were no measurable changes in the availability of these elements that could be directly related to irradiation of the soil. The release of N and P, in many soils, will be a significant nutritional factor when plants are grown on irradiated soil.

NOTES

1 Florida Agr. Exp. Sta. Journal Series No. 1476. Presented before Div. III, Soil Science Society of America, Aug. 22, 1962, at Ithaca, N. Y. The authors wish to express their appreciation to the U. S. Atomic Energy Commission for supporting this work in part.

2 Associate Soil Microbiologist and Assistant Soil Microbiologist, respectively.

Received for publication July 9, 1962. Accepted for publication August 14, 1962.






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