Received for publication February 16, 1970. Contribution from the Departments of Soil Science and Horticultural Science. Published with the approval of the Director of Research as Paper No. 3080 of the Journal Series.
The authors gratefully acknowledge the considerable advice and assistance of W. A. Jackson, Dept. of Soil Science and of L. T. Caruthers, Radiation Safety Officer.
Asst. Profs. of Soil Science and Horticultural Science, resp., Mt. Hort. Crops Res. Sta., Fletcher, N. C. 28732.
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