Participation of soluble and oxidizable soil organic compounds in denitrification

摘要: The role of soluble organic carbon (SOC) in denitrification four mineral soils and one soil was evaluated laboratory studies. Denitrification capacities SOC concentrations were determined by nitrate loss from air-dried flooded treated with a solution containing 100 μg/ml N03 −-N, while the rate consumption measured Warburg manometry on 20 g to which 10 ml water had been added. High correlation coefficients (r > 0.93) obtained between capacities, SOC, oxygen five soils. A amended extracts an soil. After incubating for 1 week, capacity enhanced decreased that Extracted lower than unextracted one. Decreases related color change. Infrared spectra precipitates indicated absorption at wave number 1420–1440 cm -1 also changes. It implied low molecular weight fulvic acid like compounds represented mineralized denitrification, their supply solubilization matter influenced