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	Plant perception of soil heterogeneity in the field Hrouda, Adam ; Weiser, Martin (advisor) ; Martínková, Jana (referee) Nutrients are usually patchily distributed in natural soils. Plants are often able to respond to nutrient heterogeneity in artificial conditions by active plastic changes of root system morphology. The occurrence or magnitude of a foraging response can be altered by the presence of competition. However, it is unclear to what extent root foraging takes place in the field. I conducted a field experiment in order to determine the effect of an artificial nutrient patch on fine belowground biomass of (a) an established community and (b) model plants. The study array consisted of a grid of 30×30 cm plots with model plants located in the centre. Half of the plots contained the artificial patch located 5.5 cm from the model plant. Fertilizer patch treatment did not increase mean plot fine underground biomass. Instead, fine underground biomass was higher in places of greater soil moisture estimated from mean plot EIVs. Neither total model plant root biomass nor proportion of roots in the enriched quarter increased in the fertilizer treatment. Competition was probably higher in fertilized than in control plots judging by a 2-fold increase in death rate of model plants. However, greater proportion of model plants flowered in the treatment plots. Possible causes include a plastic response to the patch as well... Detailed record
	Heterogeneity of rhizosphere and root system architecture Procházka, Michal ; Soukup, Aleš (advisor) ; Ponert, Jan (referee) Detailed record
	Mapování heterogenity půdních podmínek v precizním zemědělství Oudová, Barbora Precision agriculture is an agronomic approach that aims to optimize inputs into agricultural production to achieve balanced, qualitatively and quantitatively the best possible yields, while minimizing the financial costs and maintain or improve the environment. The basic premise of this approach is the knowledge of soil conditions of land used for agricultural production. This information can be found in agronomic records, soil maps or results of agrochemical testing. Indirect methods of soil heterogeneity mapping based on the principle of sensor measurements and remote sensing are also available. Indirect methods for determining the physical-chemical properties of soil are generally user-friendly, cheaper, faster, and have a higher density of measurement points than the sampling of soils. Comparison of direct and indirect methods showed that indirect methods provide a detailed picture of soil variability. However, interpretation of results is affected by many other factors, which are based in the principle of soil het-erogeneity itself. Detailed record

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