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Gewählte Diplomarbeit / Masterarbeit:

Diplomarbeit / Masterarbeit - Institut für Ökologischer Landbau (IFÖL), BOKU-Universität für Bodenkultur, pp 48. UB BOKU obvsg

Datenquelle: ZID Abstracts
Within the framework of organic farming principles, a goal is the steady reduction of external fertilizer input and their substitution by fertilizers produced on the farm. Fertilization strategies combining basic fertilizers like compost or grass-clover silage that can be produced on the farm with external fertilizers used as additional top-dressing are required. To help understand the effects of different individual and combined organic fertilizers on N supply, an incubation was carried out using thirteen experimental treatments made up of three basic organic fertilizers, two organic fertilizers for top-dressing, six combination treatments and two different control treatments. The fertilizers were added in approximate N-equivalent amounts. Nitrogen mineralization and CO2 evolution were evaluated throughout the incubation. CO2 evolution measured was related to carbon mineralization and thus to organic matter and C input. The intensity of the nitrification process did not necessarily depend on the quantity of ammonium present at the third day after adding the fertilizers. For all the treatments studied, no clear relationship was established between CO2 evolution and mineral N content. It was possible that sampling-induced variability due to possible spatial and temporal differences of biomass distribution in the experimental pots was very high. The combination treatments compost+legume meal and grass-clover silage+legume meal showed the greatest percentage of N turnover in relation to the amount of Nt added, as well as an added effect compared to the expected values of the fractions alone, and therefore are recommended for future studies under controlled conditions and in the field. Longer testing with combinations of organic fertilizers is recommended in both field and incubation studies to evaluate short-term and long-term availability of N. Additional effects may become significant only until after several years of organic fertilizer application.

Beurteilende*r: Friedel Jürgen Kurt
1.Mitwirkender: Balas Johannes

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