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This article in SSSAJ

  1. Vol. 45 No. 2, p. 338-341
     
    Received: Aug 21, 1979
    Accepted: Oct 29, 1980


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doi:10.2136/sssaj1981.03615995004500020022x

Ammonia Volatilization as Influenced by Calcium Carbonate Particle Size and Iron Oxides1

  1. John Ryan,
  2. Denis Curtin and
  3. Iman Safi2

Abstract

Abstract

Most ammonia volatilization studies have focused mainly on specific fertilizers, management, and environmental factors associated with N loss. The objective of this study was to evaluate the influence of particle size of both added and native CaCO3 and the modifying effects of Fe oxides on NH3 volatilization. Samples of calcareous and noncalcareous Lebanese soils were adjusted to field capacity, treated with (NH)2SO4, and incubated for 24 hours. Nitrogen loss was significantly related to pH, cation exchange capacity, and CaCO3 but was more closely related to clay-sized CaCO3 than to total CaCO3. When ground limestone of different particle sizes was added to noncalcareous soils, N loss was directly related to the clay-sized fraction. Volatilization was greatly reduced when calcareous soils were pretreated with FeCl2 solutions. Though the results suggest that CaCO3 particle size and Fe oxides may significantly influence N volatilization in synthetic laboratory studies, these factors may be of little or no consequence in the field.

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