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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Preparation of soil conditioners and characterization of their nutrient release kinetics
 Horváthová, Lenka ; Jančář, Josef (referee) ; Lepcio, Petr (advisor)
This diploma thesis deals with the preparation of multifunctional soil conditioners based on potato starch, in order to slow down the release of nutrients. Materials with different contents of superabsorbent polymer and zeolite were prepared. Spectra indicating the formation of new bonds were evaluated by infrared spectroscopy. The kinetics of nutrient release were observed in the prepared samples of soil conditioners in an aqueous medium, where nutrient retention was demonstrated. Other samples were tested on plants, which proved a mostly positive effect on growth and other factors.
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Research on the release of nitrogen compounds from fertilizers
 Cápková, Viola ; Řezáčová, Veronika (referee) ; Komendová, Renata (advisor)
This bachelor thesis deals with the monitoring of the release kinetics of ammonium, nitrate and phosphate ions from slow release fertilizers covered in potassium polyacrylate. Fertilizer samples were subjected to different extraction reagents and experimental conditions. The effect of dynamic and pressure conditions in comparison to the static conditions was investigated, same as exposion to distilled, drinking and atmospheric water. The change in concentration of each analyte was measured at regular intervals using molecular spectrophotometry. Distilled water was found to be the best extraction reagent, with no significant difference between the experimental conditions. Slow release of nutrients was proved for two fertilizer samples, the urea fertilizer and it’s modified form.
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