Interferences of Johnson grass [Sorghum halepense L. (Pers.)] with some robust plant species.
Aims: Species that show strong competition strategies can shape the use of available resources, with the impact of environmental changes. Thus, the identification of the factors that influence the competitiveness of species with high populations plays an important role in determining the strategies that can be used to prevent the spread of these species. In this study the competitive abilities of Sorghum halepense (Johnson grass - SORHA) with Bromus japonicus (Japanese brome - BROJA), Salvia fruticosa (Anadolu sage - SALFR), Festuca rubra var. rubra (red fescue - FESRU) or Festuca ovina (sheep fescue - FESRU) species was examined. Methods and Results: The competition trials were carried out in sterile 9 cm diameter petri dishes in laboratory. According to the results the competition relations were measured; the stem and root lengths of SORHA - BROJA, BROJA - SORHA, SORHA - FESOV and FESOV - SORHA, stem weights of SORHA - FESRU and FESRU - SORHA, and stem lengths of SORHA - SALFR and SALFR - SORHA differences are important compared to controls of these species. Conclusions: Interferences are high in the plant-plant relationship between all species. This may indicate that it will be difficult for the selected species to be significantly affected by each other in the species composition. Significance and Impact of the Study: Species with high competitiveness may show the ability to be the dominant species in their areas, which may significantly threat to biodiversity. Therefore, the data obtained from studies aimed at determining the competitiveness of strong plant species on each other can be used in management and/or precautionary studies that can be taken for saving biological diversity.