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29 - 30.page11 - Selected Soil and Organism C arbon/N...

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Unformatted text preview: Selected Soil and Organism C arbon/N itrogen Ratios 20:1 is the key firm/(point Material C/N Ratio Spodosol O horizon Tropical Exergreen litter (Oi) Fungi Digested sewage sludge Bacteria NITRIFICATION Nitrification is the biological oxidation of: NH 4+ (ammonium) to NO; (nitrite) and their to NO; (nitrate). The process is carried out by two groups of autochemotropic organisms: Nirmsm/nun/ms 7 oxidizes ammonium ions to nitrite Nifmcm‘vus - oxidizes nitrite to nitrate. NITRIFICATION Rate of nitrification depends on: - oxygen and carbon dioxide contents of soil - soil pH - an energy source - temperature: minimum ~ 50“ F (1(7)n C) maximum ~ 75n F (24n C) ...
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