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Gewählte Master / Diploma Thesis:

Master / Diploma Thesis - Institut für Bodenforschung (IBF), BOKU-Universität für Bodenkultur, pp 141. UB BOKU obvsg FullText

Data Source: ZID Abstracts
In September 2018 samples from 98 topsoils all over Lower Austria were taken and compared to archive material which was sampled twenty to forty years ago in the exact same places. The main focus was on hydromorphic soils, or soils containing at least gleyic and stagnic properties. It turned out that some plant nutrients are in the low range at the sampled locations. When looking at the changes on the soil parameters over time, a significant reduction in the pH-value and the amorphous silicon fraction was found for the grassland. A significant increase occurred for the total organic carbon content, total nitrogen content, C/N-ratio, as well as for the potassium and silicon availability. In the arable land, there were (partial) changes on the soil parameters, which were not significant due to the small number of locations and the (partially) high variances. Examining the influence of soil and climatic factors on the Si fractions, the total organic carbon content had a negative effect on both fractions. For the potentially plant available Si fraction, the pH-value and clay content were shown to be positive effects. The amorphous Si fraction was negatively influenced by the pH-value and the proportion of sand. The influence of the climatic factors could not be shown. It turned out that some plant nutrients are in the low range at the sampled locations. Future silicon studies of soils in Austria ought to be carried out using the methods listed to ensure comparability of data. For the total organic carbon content, an additional consideration of the different fractions is suggested. In order to investigate the insufficient supply of phosphorus, an evaluation of the use of the current surcharge system for the low salary classes is recommended. Since the CAL-method does not record the biogenic phosphorus pool, additional recording would be advisable to describe the nutrient supply in a better way. The creation of limit values for the silicon supply in our climatic region for cultivated plants and grass seed mixtures for grassland use is recommended.

Beurteilende(r): Wenzel Walter
1.Mitwirkender: Puschenreiter Markus

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