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Soil Nitrogen Loss as a Result of Alternate Submergence and Drying¹

ABSTRACT

Successive cycles of submergence and drying resulted in the loss of 15 to 20% of the total soil nitrogen. Nitrogen was nitrified during the aerated portion of the cycle and lost when the soil was submerged. Most of the loss occurred during the first three cycles of submergence and drying. The soil oxidation-reduction potential decreased rapidly after the initial submergence. The more times the soil had been submerged and dried, the slower the oxidation-reduction potential decreased when the soil was again submerged. Carbon and nitrogen were lost in approximately the same ratio that they occurred in the soil.

¹ Contribution from the Department of Agronomy, Louisiana State University. Presented before Div. S-3, Soil Sci. Soc. Am. Nov. 18, 1963 at Denver, Colo.

² Professor of Agronomy, Louisiana State University and Agronomist, Doornkop Sugar and Food Industries, Ltd., Natal, Republic of South Africa. The assistance of M. L. Madden and H. D. Durst in this study is gratefully acknowledged.

Received for publication December 19, 1963. Accepted for publication May 6, 1964.

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