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Losses of Nitrogen from Some Flooded Soils in Tracer Experiments¹

ABSTRACT

Nitrogen losses were measured in laboratory and greenhouse experiments in four flooded soils after addition of ¹⁵N-tagged (NH₄)₂SO₄ or rice straw after various incubation periods. Substantial losses occurred in all cases except where NH₄⁺-N was rapidly immobilized and/or fixed by clay minerals. The necessity for nitrification as a prelude to N loss was demonstrated by showing that no loss occurred when oxygen was excluded and that where no nitrate was produced, no N₂ was evolved. Growing rice plants (Oryza sativa) effectively reduced the magnitude of the nitrogen loss.

¹ Contribution from Department of Soils and Plant Nutrition, Univ. of Calif., Davis, and Int. Rice Res. Inst., Los Banos, Philippines. Assistance by the Rockefeller Foundation is gratefully acknowledged.

² Professor of Soil Microbiology, Univ. of California, Davis 95616, and former Research Fellow, IRRI, respectively.

Received for publication April 13, 1971. Accepted for publication June 15, 1971.