Microbial Respiration and Exchangeable Ammonium in Podzol Organic Horizon Materials Treated with Urea

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Abstract
Microbial activity was stimulated more in litter (L) and fermentation (F) than in humus (H) horizon materials by the addition of urea. Both pH and soluble carbon in water extracts were increased by urea treatment. Immobilization of nitrogen from the added urea was greatest in the L horizon materials followed in order by the materials from the F and H horizons. The relevance of these results to field practice is discussed.

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