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Gewählte Master / Diploma Thesis:

Lukas Tremetsberger (2010): Influence of botanical competition on biomass production and nutritive quality of three grassland crop species.
Master / Diploma Thesis - Institut für Pflanzenbau und Pflanzenzüchtung (IPP), BOKU-Universität für Bodenkultur, pp 57. UB BOKU obvsg

Data Source: ZID Abstracts
Abstract:
The objective of this study was to assess the influence of weeds in mixtures on the biomass yield of selected crop species and the effects on the nutritive quality of the crops in terms of digestibility of the organic matter and net energy content. Three grassland forage crop species including perennial ryegrass (Lolium perenne), chicory (Cichorium intybus) and red clover (Trifolium pratense) were grown in binary mixtures with each of nine different weed species belonging to the functional groups of grass, herb and legume in an outdoor pot experiment in Uppsala, Sweden. All plants were harvested at the same time and the produced biomass was measured for each species separately. The in vitro digestibility of the organic matter was analysed with the method of Tilley and Terry (1963) and net energy for lactation content was calculated by means of the digestible organic matter. Crop biomass was in most cases reduced due to competition with weed species when compared to pure stand crop yield, disregarding the crop species. Very productive weed species in weed monocultures could maintain their high yield also in mixtures with crops and contributed to increased total mixture yields. The digestibility of the organic matter of the crop species was not significantly changed in most of the treatments, which has been shown by other studies in the past. Net energy content was similar to the digestibility and partly corresponds with literature, which shows the greatest changes due to interspecific competition in protein content. The fact that competition with weeds did not significantly decrease the nutritive value of forage crops is of importance for the use of mixtures in animal nutrition. In permanent grassland a certain content of herbs and legumes is tolerated and desired. The results of this study can only be carefully transferred to the situation under commercial farming conditions due to the experimental approach used in this work.

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