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Nitrogen Mineralization in Florida Histosols¹

ABSTRACT

The N-mineralization rates of several Florida Histosols and the effects of soil moisture tension and organic C amendments on these rates were measured in the laboratory with an ¹⁵N-tracer technique. An enhancement of microbial activity by crop residues was exhibited by greater N mineralization in cropped vs. uncropped soils. Nitrogen mineralization was not affected by soil moisture tension over the range of 0.1 to 3.0 bar. Exogenous C supplies such as glucose or St. Augustinegrass [Stenotaphrum secundatum (Walt.) Kuntz] stimulated mineralization of native soil organic matter. Mineralization of soil organic N was increased by 91% in glucose amended soil samples. The N-mineralization rate for a 75-cm profile of Pahokee muck was estimated to be 686 kg N/ha for each centimeter of soil lost to microbial oxidation.

¹ Florida Agricultural Experiment Station Journal Series no. 1724.

² Assistant Professor, Agric. Res. and Educ. Center, University of Florida, P. O. Drawer A, Belle Glade, FL 33430. The author's present address is Dept. of Agronomy, and Horticulture, Brigham Young Univ., Provo, UT 84602.

Received for publication January 15, 1979. Accepted for publication February 25, 1980.

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