ISSN:
1432-0789
Keywords:
Key words Nonexchangeable ammonium
;
Availability
;
Soil microorganisms
;
Temperature
;
Available carbon
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Geosciences
,
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Abstract To estimate the availability of nonexchangeable NH4 +-N for soil microorganisms four incubation experiments were conducted under controlled conditions. The following results were obtained: Incorporating glucose as a source of readily oxidizable organic material favored the release of nonexchangeable NH4 +-N. Mobilization of NH4 + from the interlayers of the clay minerals was decreased by the application of K+, while Ca2+, which is supposed to expand the lattice of the clay minerals, had no influence on the release of NH4 +. Soil temperature had no effect on microbiological mobilization of NH4 +. It is assumed that, generally, the influence of nitrifying bacteria on the mobilization of nonexchangeable NH4 +-N is negligible. However, in soils with abundant amounts of available carbon promoting the activity of heterotrophic soil microorganisms, the release of NH4 + from clay minerals is favored under fallow conditions.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00382520
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