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Gewählte Doctoral Thesis:

Petra Haslgrübler (2015): Qualitätskriterien geernteter Samenmischungen von ökologisch hochwertigen Grünlandflächen.
Doctoral Thesis - Abteilung Pflanzenbau, BOKU-Universität für Bodenkultur, pp 68. UB BOKU obvsg

Data Source: ZID Abstracts
Abstract:
Extensively managed semi-natural grassland can be regarded as a seed source useful to establish new valuable areas. Semi-natural grasslands are normally rich in species of native provenance and for this reason they can be harvested to obtain valuable propagation material. Therefore different harvesting methods (green hay, on-site threshing and seed stripping) have been developed and tested. It is important to guarantee a certain level of seed quality and a successful germination rate of the harvested seed mixtures. After the determination of purity and thousand seed weight, the pre-tests started in the climate chamber. The germination capacity was tested to determine the substrate and dormancy breaking treatments. In the first trial, three substrates (organic growing media, quartz sand and filter paper) were tested. Organic growing media showed the highest germination rate. In the second trial, the germination capacity of the seed mixture was tested on organic growing media with dormancy breaking treatments (pre-chilling, addition of potassium nitrate (KNO3) and gibberellin acid (GA3)). In general, the germination capacity of the prechilled variants was lower. In the next steps the harvested seed material was stored under different conditions up to three years and tested once a year. The results showed that storage under different conditions and the length of storage influenced the germination capacity significantly. Storage under cool and dry conditions revealed better results. There is a strong positive relationship (correlation) between the proportion of mature seed and germination percentage. A receptor site was cultivated using green hay material from the donor site right after the harvest in July. The on-site threshing material was then sown at the end of August using 3 g/m². After already four years of observation no significant differences could be found between green hay and on-site threshing material concerning the transfer rate of target species.

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