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Characterization of Mineralizable Nitrogen in Soils¹

ABSTRACT

A study of the changes in total N, fixed ammonium N, and hydrolyzable and nonhydrolyzable forms of N that occurred when soils were incubated under conditions which promoted mineralization of soil N showed that prolonged incubation led to a marked decrease in all forms of N determined excepting fixed ammonium N and indicated that native fixed ammonium is practically unavailable to soil microorganisms. It also showed that there are marked differences among soils with regard to the nature of the N that is most readily mineralized and made available for plant growth and indicated that any chemical method of obtaining an index of soil N availability based solely on determination of a hydrolyzable or nonhydrolyzable form of soil N will prove unsatisfactory.

¹ Journal Paper no. J-5374 of the Iowa Agr. & Home Econ. Exp. Sta., Ames. Projects 1070 and 1450.

² Formerly Research Associate and Professor, respectively, Department of Agronomy, Iowa State University, Ames. The Senior author is now Assistant Professor of Soils, University of Wisconsin, Madison.

Received for publication April 7, 1966. Accepted for publication July 7, 1966.