Cordovil, Cláudia Marques dos SantosTeixeira, Tânia Sofia Galego2009-03-122009-03-122008http://hdl.handle.net/10400.5/631Mestrado em Engenharia do Ambiente - Instituto Superior de AgronomiaWith the objective to predict the availability of nitrogen (N) to the plants from the mineralization of soil organic matter and from organic residues applied to the soils, a quick and easy to perform waterlogged incubation experiment was developed, to investigate the mineralization of organic matter in 20 different soils, with and without application of two different organic residues (poultry manure and secondary pulp mill sludge). Soils tested, differed in texture, organic matter content as well as in pH and nutrients contents. A mild solubilizing agent (H2O) was used to extract easily mineralizable N both from soils and from mixtures of soils and residues. A ten days anaerobic incubation at 37ºC was performed for 10 days and sampled over this period. At each sampling time, a one hour extraction with 2M KCl was also done. A first-order kinetic model was fitted to the data, to predict N mineralization behavior in soils and mixtures. A quick chemical method using KCl 2M at 100ºC was also correlated to the model equations obtained, to better predict N mineralization. The results from both anaerobic incubation method and chemical extraction were promising in some soils, especially when soil texture was lighter. Poultry manure showed a similar mineralization pattern regardless of the soil to which it was added.pororganic residuessoilsN mineralizationanaerobic incubationchemical methodresiduos orgânicossolosmineralização do azotoincubação anaerobiamétodo quimico expeditomaster thesis