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Gewählte Master / Diploma Thesis:

Manuela Zettl (2017): Ertrags- und Qualitätsverlust im Grünland verursacht durch Hagelschaden.
Master / Diploma Thesis - Abteilung Pflanzenbau, BOKU-Universität für Bodenkultur, pp 109. UB BOKU obvsg

Data Source: ZID Abstracts
In the practice of damage survey the evaluation of hail damages in cultivated pasture is one of the most challenging due to the inhomogeneity of the plant population. The goal of this study is to build a theoretical basement for the further development of damage survey in the daily practice. The main focus lies in the discovery of the quantitative and qualitative losses in the grassland caused by hail damage. For this purpose, a scientific test was made in Piber, Styria. The experimental parcels were damaged in three different intensities, despite of this there was an undamaged control parcel. The yield of the undamaged, as well of the damaged plant population took place in three different harvest heights. Additional there was made a survey of natural caused hail damage grasslands in Styria and Lower Austria. The parameters of pollution, quality, quality yield and dry matter yield have been analyzed. The results display quality losses due to pollution. Extra high pollution values were found in vigor intensive-grassland with high projective covering in moist/wet habitat. Here raw ash concentrations from more than 20% were reached, with the result that this feed wouldn't be any more suitable for animal nutrition. Regarding the energy concentration of the plant population, the values remained in 'good' till 'very good' range despite of damage. The quality yield losses based on hail damage moved between 2 and 13% within the stage of punctual harvest deploy at first growth, according to damage intensity. The follow-up growth, in the same stage, showed losses of quality yield between 4 and 12%. The losses in yield after a damage event differed according to development stage and damage intensity. The highest loss of yield in the test was found in the stage 'sprout' of the follow-up growth. Furthermore, the results showed that the degree of leaf damage increased according to the leaf proportion in the plant populations.


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