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The Effect of Gamma and Neutron Irradiation of Soil on the Yield and Nutrient Uptake of Rye¹

ABSTRACT

Cecil sandy loam and Lakeland sand with 6 fertility treatments, at field capacity and air dry, were subjected to 3 rates of mixed gamma and neutron radiation from an airshielded 10 megawatts thermal reactor. Rye was grown as a test crop on these soils in the greenhouse. Forage yield and uptake of N, P, K, Ca, Mg, and Na by rye were used to evaluate irradiation effects. Yields of rye on Cecil soil were increased as a result of irradiation when N was limiting, probably as a result of increased mineral N from dead organisms. The uptake of P, K, Ca, Mg, and Na was not affected by irradiation, except where influenced by an increased yield due to N. Soil moisture at irradiation time did not influence irradiation effects on rye yields.

¹ Journal Paper No. 281 of the Univ. of Georgia College of Agr. Exp. Sta., Supported in part through Contract No. AT(40-1)2412 between the U. S. Atomic Energy Commission and Emory University. Presented before Div. IV, Soil Science Society of America, Ithaca, N. Y. Aug. 1962.

² Formerly graduate assistant, Dept. of Agronomy, Univ. of Ga., now Assistant Agronomist, Ga. Exp. Sta., Experiment, Ga., and Assistant Professor, Dept. of Agronomy, Univ. of Ga., respectively.

Received for publication April 17, 1963. Accepted for publication January 27, 1964.