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This article in SSSAJ

  1. Vol. 51 No. 5, p. 1191-1194
    Received: Jan 12, 1987



Soluble Organic Nitrogen Losses Associated with Recovery of Mineralized Nitrogen1

  1. S. J. Smith2



The extent and subsequent availability of soluble organic N in soil mineralization extracts were determined using initially air-dry soil samples. Involved were eight Southern Plains agricultural soils comprising five soil orders. The major losses of soluble organic N occurred during the initial leaching prior to incubation, and are attributed to factors not directly associated with the mineralization procedure (e.g., freshly decomposed plant residues, pretreatments, etc.). Often, these losses were as high or higher than initial values for inorganic N. Thereafter, the organic N losses represented, on average, only about 5% or less of the inorganic N produced in surface soil samples during 84 d of aerobic mineralization. This was the case for both indigenous and fertilizer-incorporated N. Subjecting the soluble organic N in the mineralization extracts to subsequent aerobic, anaerobic, or autoclave procedures indicated no excessive N availability. Distribution of the soluble organic N components in the extracts did not differ greatly from that of soil. In general, soluble organic N losses were not a major factor associated with recovery of mineralized N.

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