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Vliv aplikace plazmatem aktivované vody na půdní strukturu
Jedlička, Jan
Progress can not be stopped even in agriculture, new techniques and technologies are applied and also interconnected with new specializations. In addition, alternative sources for fertilizers and plant protection products are being researched. Recently, the possibility of using plasma-activated water (PAW) in crop production as a source of nitrogen, along with fungicidal and bactericidal effects have been pointed out. For the time being, however, there is no verified effect on soil properties. This work aimed to verify the effect of PAW application on the soil structure, or water resistance of soil aggregates. The values of two types of PAW (PAW-AC, PAW-DBD) were assessed against the control (distilled water). The container experiment was administered in the form of gradual watering of the soil in flower pots and gradual termination in 5 terms (1st term 525 ml, 2nd term 825 ml, 3rd term 1125 ml, 4th term 1425 ml, 5th term 1725 ml). Soil samples were taken from the flowerpots in 3 layers (Top, Center, Bottom) to verify the potential accumulation of fluid efficiency in some parts of the container. From the comparison of two variants of plasma-activated water (PAW-AC and PAW-DBD) with the control (distilled water), it can be seen that neither variant of PAW violates the stability of soil aggregates and therefore the soil structure. Based on the pilot experiment, it would be possible to state that the application of PAW does not worsen the condition of the soil structure and could become part of agricultural management without affecting this property. However, further experiments with other soil types are needed.
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Importance of biotic and abiotic components in feedback between plants and soil
Hanzelková, Věra ; Pánková, Hana (advisor) ; Knappová, Jana (referee)
The plant-soil feedback affects the forming of a plant community. Plants affect their own species as well as other species. The plant-soil feedback can be both positive and negative. Plants affect soil, change its properties, and the soil affects the plants reciprocally. Soil components can be divided into biotic and abiotic ones. The abiotic component is represented by physical and chemical properties of the soil. The main properties are the soil structure, the soil moisture, the soil temperature, the soil pH and the amount and availability of nutrients. The biotic component is composed of soil biota. The individual organisms can function as decomposers, symbionts and pathogens. The majority of soil organisms is composed of microorganisms, the most important of which are fungi and bacteria. The effect of the abiotic component in plant-soil feedback is mostly nonspecific, while the effect of the biotic component is more specific. These components interact with each other and determine the resulting effect on the plants and the type and intensity of interaction between various plant species. The aim of this thesis is to show the importance of these components in the plant-soil feedback. Key words: plant-soil feedback, abiotic factors, biotic factors, soil structure, soil water, soil temperature, pH,...
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Using the dye tracer for visualization of preferential flow in macro- and micro-scale
Kodešová, R. ; Němeček, K. ; Kodeš, V. ; Žigová, Anna
Study is focused on the visualization of the preferential flow in different soil types and their horizons using the dye tracer experiment. The field ponding dye infiltration experiments were performed in two soil types: Haplic Luvisol and Haplic Cambisol. In addition, the thin soil section were made and micromoprphological images were used to study soil aggregate structure and dye distribution in microscale. Images of the dye patterns (taken in macro- and micro-scales) documented very different nature of the preferential flow in different soil types and also within the soil profiles.
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