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This article in SSSAJ

  1. Vol. 50 No. 3, p. 633-639
     
    Received: June 29, 1985


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doi:10.2136/sssaj1986.03615995005000030018x

Nitrification Rates in Profiles of Differently Managed Soil Types1

  1. Aviva Hadas,
  2. Sala Feigenbaum,
  3. A. Feigin and
  4. Rita Portnoy2

Abstract

Abstract

The variation of nitrification rates among soils and within soil profiles has received little attention compared with the well-established relations with soil moisture and temperature. In this study, the rate of nitrification was determined in profiles of various soil types and under different agricultural management. Verhulst's equation was used to express the accumulation of nitrate (NO-3) with time and modified to describe the rate of ammonium (NH+4) decrease. The maximal rate of nitrification (Kmx) and the delay period (t′) were derived from the equation and used to characterize quantitatively the nitrification process in various soil samples. The Kmx and t′ of surface soil samples were from 5 to 70 mg kg−1 d−1 and from 0.2 to 8 d, respectively. The Kmx decreased and t′ increased with soil depth. Soil factors mostly affecting the rate parameters were: pH decreasing from 7.8 to 6.6 or HCO-3 decreasing below 1 mol m−3, previous agricultural management, and soil depth. Data obtained from 15N studies indicated that mineralization rate of soil organic N in NH+4-treated soils was not always negligible relative to nitrification.

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