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- W64655114 abstract "Soil is the physical support for plants and the nutrients and the water storage. It receives organic matter primarily from dead roots and wastes, but also from secondary producers activity or fertilizers, added at the surface or buried. The mineralization process by the microorganisms turns available mineral nutrients that may be uptake by the plants, closing the nutrients cycle, or become a source of pollution for aquifers and water lines when they are leached. The microorganisms activity in soil depends on several processes which are affected by temperature, water content and different nutrients proportions. The aim of this dissertation is to analyze and to model the main microbiological processes related to organic matter mineralization, nitrification, denitrification, and phosphorus solubilization and fixation. The processes will be described according to the cycles of the main elements: carbon, nitrogen and phosphorus. This work represents the continuation of the developed model by Galvao (2002), with the inclusion of the phosphorus cycle and the ability to respond to temperature, pH and soil porosity variations. The model was developed in a first step in Powersim, in order to verify the adopted formulation consistency, and after that in Fortran 95. The results validation was made by comparing the model with a version of the RZWQM model. A comparison between the RZWQM and two years (2004-2006) of water content, nitrate and ammonium data was also done. This data was obtained by the Estacao Agronomica, from an experimental corn field in Alvalade-Sado in the project Agro 727." @default.
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- W64655114 date "2007-01-01" @default.
- W64655114 modified "2023-09-27" @default.
- W64655114 title "Carbon, Nitrogen and Phosphorus Soil Cycle Modelling" @default.
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