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Dactylis glomerata L. subsp. slovenica (Dom.) Dom. has been recorded in Western Caucasus at southern slopes of the Abishira-Akhuba range (Karachay-Cherkessia Autonomous Republic belonging to the Russian Federation). This new information is very important supplement dealing with the distribution of this taxon, because the area of its known distribution was moved very strongly to the East.
Zmienność i współzależność cech ekotypów wiechliny łąkowej (Poa pratensis L.) z rejonu Polski południowo-wschodniej
The impact of adding a natural clay sorbent such as halloysite on the content of selected heavy metals in the biomass of common orchardgrass (Dactylis glomerata L.) was studied in a pot experiment. The study was conducted on mucky soil enriched anthropogenically with heavy metals, whose values exceeded permissible standards of soil quality and values of the geological background. The experiment included three variants with differentiated percentage of halloysite, i.e. 10%, 30% and 50%, as well as two control cultivations. The results confirm the impact of halloysite on the physicochemical properties of soil, consisting in increased soil pH and sorption capacity. Addition of halloysite to soil also differentiated the quantity of crop yield and concentration of heavy metals in the plant and soil. Halloysite was found to have an inconsistent impact on the concentration of heavy metals in the biomass of common orchardgrass, which was proven by some elevation in the level of heavy metals and a higher bioaccumulation factor (BAF). Halloysite constituting 50% of the mass of substrate substantially increased the consumption of Pb and reduced the sorption of Cr. Addition of halloysite stabilised Zn and Cu in soil. The results of our preliminary investigation indicate that addition of halloysite to soils with excessive concentrations of heavy metals influences the level of soil sorption to the extent which may be effective for soil remediation.
Diploid Dactylis glomerata L. subsp. aschersoniana (Graebn.) Thell. is a late form with good winterhardiness and resistance to shading. It was used as a component of binary mixtures with alfalfa. The many years experiment was laid out as a randomised complete block design at two locations and it was utilised for three consecutive years. There were harvested four cuts each year. Total dry matter yields of Dactylis glomerata L. subsp. aschersoniana monoculture were lower than those of cocksfoot for all years of utilisation. However, in all cases Dactylis glomerata L. subsp. aschersoniana-alfalfa mixtures outyielded or tended to outyield pure alfalfa. Mean percentage of alfalfa in dry matter of mixtures with Dactylis glomerata L. subsp. aschersoniana was many times higher than in the mixture with more aggressive tetraploid cocksfoot. Organic dry mattcr in vitro digestibility of the mixtures with Dactylis glomerata L. subsp. aschersoniana ranged from 61,5% in the 1st cut to 77,8% in the 4th one. In the 1st cut, it was significantly higher than in the mixture with cocksfoot.
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