Abstract
The effect of fertilization with urea and ammonium nitrate on nitrogen mineralization was studied in a series of laboratory incubation experiments. The samples (humus layer) were collected from field experiments with different applications of fertilizers during a period of 11–14 years. The nitrogen fertilization influenced some chemical properties of the humus layer such as pH, N-Kjeldahl content and the content of inorganic nitrogen, especially in the samples from North Sweden. Nitrate nitrogen was formed in humus samples classified as non-nitrifying in several cases, usually after urea fertilization.
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Popovic, B. The effect of nitrogenous fertilizers on the nitrification of forest soils. Fertilizer Research 6, 139–147 (1985). https://doi.org/10.1007/BF01051008
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DOI: https://doi.org/10.1007/BF01051008