Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.5/631
Título: Previsão da mineralização do azoto a partir de solos e resíduos orgânicos
Outros títulos: Estimating nitrogen mineralization from soils and organic wastes
Autor: Teixeira, Tânia Sofia Galego
Orientador: Cordovil, Cláudia Marques dos Santos
Palavras-chave: organic residues
N mineralization
anaerobic incubation
chemical method
residuos orgânicos
mineralização do azoto
incubação anaerobia
método quimico expedito
Data de Defesa: 2008
Resumo: With 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.
Descrição: Mestrado em Engenharia do Ambiente - Instituto Superior de Agronomia
URI: http://hdl.handle.net/10400.5/631
Aparece nas colecções:BISA - Dissertações de Mestrado / Master Thesis

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