THE INFLUENCE OF POTENTILLA REPTANS EXTRACTS ON THE PHYSIOLOGY OF AGROPYRON REPENS L. PLANTS

During the experiments, the influence of the aqueous extracts obtained from the leaves of Potentilla reptans on the physiology of Agropyron repens was studied.Agropyron repens is a plant of spontaneous flora of Romania, growing on cultivated and uncultivated soils and is one of the most harmful plants in agriculture.In areas where Potentilla reptans grows, couch grass growth is inhibited; this demonstrates that this plant can have an allelopatic action on the couch grass. During these experiments, aqueous extracts from the leaves of Potentilla reptans were used in concentrations of 5 g / l, 10 g / l, 15 g / l and 20 g / l. These extracts were used in order to water the Agropyron repens plants .The experiments focused on the intensity of leaf photosynthesis, leaf respiration intensity, transpiration intensity, leaf water content and chlorophyll content.In the variant with a concentration of 5 g / l, photosynthesis had much lower values, and at 20 g / l the process was reduced by about 50%.Regarding the respiration process, there was an increase, but only at high concentrations of the extracts (15 and 20 g / l). At low concentrations, the differences from the control were undetectable.In the control variant, the intensity of leaf transpiration had the lowest value. In the other variants, it has been found to intensify the transpiration process in proportion to the increase in the concentration of the extracts