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Preparation and characterization of novel materials based on combination of humic acids and chitosan
Kozelková, Aneta ; Pekař, Miloslav (referee) ; Sedláček, Petr (advisor)
This bachelor thesis deals with an application potential of newly developed forms of mixed composites of humic acids, chitosan and commercial granulated inorganic fertilizer.. The main aim was to test some preparation methods selected on the basis of literature search. The experimental part focused on characterization of prepared composite materials, the main attention was paid to the sorption of water, release of humic acid and mineral nutrients into solution, and last but not least, on the mechanical properties of resulting materials. The motivation of this work comes from the potential of agricultural and environmental applications of such composites resulting in a renewal of previously exhausted organic content of soils and consequent interruption of substantial soil degradation.
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Quantification of the Influence of Biochar on Soil Respiration
Losová, Anežka ; Mravcová, Ludmila (referee) ; Kalina, Michal (advisor)
This master‘s thesis is focused on the investigation of methods for evaluating the effect of biochar and NPK fertilizer on the activity of soil microorganisms by measuring soil respiration. The theoretical part describes the characteristics of soil, the properties of biochar and its production process. Furthermore, the literature research was focused on the definition and optimization of the various methodologies that can be used to measure soil respiration. The experimental part describes selected physicochemical characteristics of soil and biochar (pH, conductivity, water retention capacity). Thermogravimetric analysis and elemental analysis were used for measuring of the amount of organic and inorganic content and the composition of organic elements (C, H, O and N) in the soil and biochar samples. From the literature research, a dynamic incubation system was chosen for monitoring of the influence of biochar application on the microbial activity of soil microorganisms through the measurement of soil respiration. The produced carbon dioxide was sorbed into sodium hydroxide solution during the incubation and the released amount was determined by titration and conductometric method. The measured results of both methods correlated with each other, and both of these methods are suitable for determining the rate of soil respiration. Experimental data showed that biochar had positive effects on the rate of carbon dioxide production by soil respiration. The combined application of biochar and NPK fertilizer did not significantly increase the efficiency of biochar. In summary, biochar as a soil conditioner in agriculture has great potential to act and to support the level of soil respiration.
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Preparation and characterization of novel materials based on combination of humic acids and chitosan
Kozelková, Aneta ; Pekař, Miloslav (referee) ; Sedláček, Petr (advisor)
This bachelor thesis deals with an application potential of newly developed forms of mixed composites of humic acids, chitosan and commercial granulated inorganic fertilizer.. The main aim was to test some preparation methods selected on the basis of literature search. The experimental part focused on characterization of prepared composite materials, the main attention was paid to the sorption of water, release of humic acid and mineral nutrients into solution, and last but not least, on the mechanical properties of resulting materials. The motivation of this work comes from the potential of agricultural and environmental applications of such composites resulting in a renewal of previously exhausted organic content of soils and consequent interruption of substantial soil degradation.
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