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Previsão da mineralização do azoto a partir de solos e resíduos orgânicos
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Resumo(s)
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
Palavras-chave
organic residues soils N mineralization anaerobic incubation chemical method residuos orgânicos solos mineralização do azoto incubação anaerobia método quimico expedito