HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Legg, J. O. Articles by Allison, F. E. Search for Related Content PubMed Articles by Legg, J. O. Articles by Allison, F. E. Agricola Articles by Legg, J. O. Articles by Allison, F. E.

Recovery of N¹⁵-Tagged Nitrogen from Ammonium-Fixing Soils¹

ABSTRACT

The uptake by Sudangrass of N applied to two ammonium-fixing subsoils at rates ranging from 0 to 400 pounds per acre was similar to the uptake from a nonfixing surface soil. N uptake from NaNO₃ and banded (NH₄)₂SO₄ was higher than that from (NH₄)₂SO₄ mixed throughout the fixing soils, but the differences could not be attributed entirely to ammonium fixation. Where (NH₄)₂SO₄ was mixed with the soil, A values calculated from the N¹⁵ data appeared constant for all N rates. A N-balance sheet prepared from analyses of soil and plant materials accounted for 93.6% of the N¹⁵-tagged fertilizers as an average of all soils and treatments.

¹ Contribution from the Soil and Water Conservation Research Division, ARS, USDA. Presented before Div. IV, Soil Science Society of America, Atlanta, Ga., Nov. 19, 1957.

² Soil Scientists, Soil and Water Conservation Research Division, ARS, USDA, Beltsville, Md. The authors are deeply indebted to Dr. Julius White, Mr. William Comstock, and Mr. A. G. McNish, National Institutes of Health, for the performance of mass spectrometer analyses, and to Mr. Ed Schermerhorn, Soil Conservation Service, Muncie, Ind., for his assistance in collecting the Miami soil.

Received for publication August 4, 1958. Accepted for publication October 17, 1958.