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Gewählte Master / Diploma Thesis:

Christopher Schöpf (2018): Humusbilanzen und Nährstoffbilanzen auf biologisch wirtschaftenden Marktfruchtbetrieben in Österreich - Eine Erstellung und Evaluierung von Bilanzierungen zur Identifizierung möglicher Bodenverarmungsrisiken im biologischen Landbau.
Master / Diploma Thesis - Institut für Ökologischer Landbau (IFÖL), BOKU-Universität für Bodenkultur, pp 124. UB BOKU obvsg

Data Source: ZID Abstracts
For organic stockless farms an adequate nutrient supply is in many ways a challenge. In order to assess the N- and organic matter management of Austrian organic stockless farms, in this thesis N-farm gate-balances and humus-balances of 14 organic stockless farms in Austria’s main production areas were conducted. The data for this thesis was partly derived from a preceding thesis, in which P- and K-farm gate balances of the same farms were examined. In addition, further qualitative and quantitative interviews with the farmers were conducted. The comparison of nutrient-inputs and nutrient-outputs resulted for two of the examined farms in positive, for the remaining 12 in negative N-balances. Just one farm could reach an even balance, the balances of eleven farms were slightly in deficit, those of two farms were slightly excessive. In contrary, the humus-balances were consistently positive, half of the farms were situated in the for organic agriculture optimal supply range. Six farms showed an increased supply range, one was oversupplied. In this thesis, also soil analyses of P and K were conducted and the nutrient contents examined, in order to find out, if there was a correlation with the P- and K-balances of the preceding thesis. Such could not be asserted. In contrast, none of the farms was under-supplied, the results of the soil analysis ranged between optimal supply and over-supply. The results indicate that for most farms no severe negative short-term effects on soil fertility must be anticipated. In the long term though, the nutrient management should be improved to secure yields and to ensure a sustainable organic agriculture.

Beurteilende(r): Friedel Jürgen Kurt

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