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Evaluation of Selected Processes Controlling Nitrogen Loss in a Flooded Soil¹

ABSTRACT

The roles of NH₄-N diffusion, NH₄-N oxidation, NO₃-N diffusion, and NO₃-N reduction in controlling N loss from continuously flooded soil were evaluated in independent experiments. Applied NH₄-N moved from zones of high NH₄-N concentration to the zones of low NH₄-N concentration. The average diffusion coefficient (D) for NH₄-N in flooded soil ranged from 0.059 to 0.216 cm² day^–1 for different soils. Diffusion coefficients were influenced by soil type and soil-water content. Rate of NH₄-N oxidation in the aerobic layer of flooded soil range from 1.2 to 3.5 µg g^–1 day^–1 in different soils. Nitrate diffusion into the anaerobic soil layer ranged from 0.96 to 1.91 cm² day^–1, whereas NO₃-N reduction rates were 0.32 to 0.52 day^–1. The slow rate of NH₄-N diffusion from the anaerobic soil layer to the aerobic soil layer and the slow rate of NH₄-N oxidation in the aerobic soil layer indicate that these two processes are limiting steps in controlling N loss. Nitrate diffusion into the anaerobic soil layer and NO₃-N reduction in the anaerobic soil layer were found to proceed at a faster rate and are not likely to limit N loss from flooded soil.

¹ Joint contribution from the Lab. of Flooded Soils and Sediments, Agronomy Dep., Louisiana State Univ., Baton Rouge, La., Dep. of Agronomy, Univ. of Kentucky, Lexington. Ky., and Univ. of Florida, Agric. Res. & Educ. Center, Sanford, Fla. The research was conducted while the senior author was at Louisiana State Univ., Baton Rouge, La.

² Assistant Professor, Agric. Res. & Educ. Center, Univ. of Florida, Sanford, FL 32771.

³ Boyd Professor, Center for Wetland Resources, Louisiana State Univ., Baton Rouge, LA 70803.

⁴ Professor, Dep. of Agronomy, Univ. of Kentucky, Lexington, KY 40506.

Received for publication March 24, 1980. Accepted for publication June 18, 1980.

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