Прегледај по Аутор "ĐURĐIĆ, Igor"

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    EXAMINATION OF EARLINESS OF AUTOCHTHONOUS POPULATIONS OF PERENNIAL RYEGRASS
    (University of Montenegro, 2019) LAKIĆ, Željko; SOKOLOVIĆ, Dejan; ĐURĐIĆ, Igor
    Monitoring of changes in phenological phases of autochthonous populations of perennial ryegrass was conducted on the experimental field of the Agricultural Institute of Republic of Srpska in Banja Luka (Bosnia and Herzegovina) during 2007, 2008 and 2009. Seven autochthonous populations collected in Bosnia and Herzegovina (BiH) and one variety of perennial ryegrass were used for this research. This research included the following populations of perennial ryegrass: Dragočaj, Kosjerovo, Laminci, TAS, Kupres, Maglajani, Manjača and variety Maya. The aim of this research was to select populations of perennial ryegrass in the conditions of opened pollination on the basis of phenological observations. These genotypes should be selected on the basis of earliness, length of vegetation and other characteristics important for understanding the initial genetic materials included in the breeding program of forage crops. During the research, the following changes were observed in phenological phases with the perennial ryegrass: growth of generative shoots 10 cm above the ground, the length of the vegetative phase from April 1, the period from heading to start of blossoming, duration of blossoming, and the length of the growing season. Phenological phases were observed individually by recording the date of their beginning and/or ending, and duration of the phases was expressed in number of days. On the basis of the duration of particular phenological phases, the differences were observed among autochthonous populations of perennial ryegrass in duration of vegetation period until appearance of spiking. The earliest ear formation was determined in population Laminci with the average duration of vegetative period of 29 days. Population Manjača had the longest period until the ear formation, which lasted for 44.9 days. During these tests of the duration of the vegetation period, three groups were distinguished. The first group, characterized with a shorter vegetation period, included populations: Laminci (82.5 days), Maglajani (84 days) and Kupres (84.3 days). The second group with the vegetation 2 period from 87-89 days included populations: TAS, Kosjerovo and the variety Maya. The latest maturing group included populations: Dragočaj and Manjača with the average duration of vegetation period of 95 days.
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    MORPHOLOGICAL CHARACTERISTICS OF ALFALFA GENOTYPES TOLERANT TO LOW SOIL pH
    (Serbian Genetics Society, Serbia, 2019) LAKIĆ, Željko; ANTIĆ, Marina; ĐURĐIĆ, Igor; POPOVIĆ, Vera
    In total 76 varieties of alfalfa were collected and sown, and 41 alfalfa genotypes showed tolerance to lower soil pH. The selected alfalfa genotypes are then sown in a test field on the soil that belongs to the type of brown soil on the gravel or the cambisol with the soil reaction from 5.33 to 5.64. After 5 years, 10 genotypes were selected based on the agronomic properties and the experiment was set up on the soil with the pH from 5.0 to 5.1 in H2O. The following genotypes were used for these tests: G-2, G-11, G-19, G-34, G-39, G-44, G-48, G-51, G-53 and G-100. The following properties were observed: plant height (cm), number of stems per plant, stem thickness (mm), number of internodes per stem, leaf/stem ratio (%), yield of biomass in the I cut (g plant-1). During these tests, the highest degree of tolerance towards the lower soil pH was shown by the genotype G-44. Good results were achieved with alfalfa genotypes G-11 and G-48 where the percentage of survivors was over 80%. The highest average plant height during the three-year study (36.9 cm) was recorded in the genotype G-100. The high and stable yield of dry mass per plant have genotypes G-44 and G-19 and they are grouped in group I and are desirable for further breeding. Genotype and year have statistically significant and highly significant influence on the tested parameters, while the significance of the interaction of the genotype x year was determined only for the thickness of the stem.
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    RECULTIVATION OF DEGRADED SOIL DUE TO MINING ACTIVITY WITHOUT ADDING ORGANIC LAYERS OF SOIL USING ALFALFA AND MIXTURES OF GRASS LEGUMES
    (Biotechnical Faculty of the University of Montenegro, 2020) LAKIĆ, Željko; PREDIĆ, Tihomir; ĐURĐIĆ, Igor; POPOVIĆ, Vera
    The aim of this research was to examine the possibility of reparing the chemical properties of substrate and regenerating the vegetation of degraded soil due to mining activity without adding the fertile soil layer. The research was carried out in the period 2011-2013 on degraded soil of mine and thermal power plant Gacko. The experiment was placed on a landfill located in Srđevići. For these tests, grass-leguminous mixtures were used: I/G (alfalfa 70%, orchard grass 30%); II/G (alfalfa 70%, orchard grass 15%, tall oat-grass 15%); III/G (red clover 50%, italian rye-grass 50%); IV/G (alfalfa 30%, tall fescue 40%, smooth brome15%; orchard grass 15%) and alfalfa 100%. The following parameters were monitored and analyzed during the tests: mechanical soil composition, soil chemical properties, microelement content in the soil: Zn, Mn, Fe, Cu; the content of heavy metals in the soil: Pb, Ni, Cr, Cd, Hg, As, plant species presence in the mixture, soil cover with grass, yield of green mass by cuts and years, content of microelements and heavy metals in dry vegetable mass by cuts and influence of nitrate content of individual microelements and heavy metals in soil and dry mass of plants. Studies of the content of microelements and heavy metals in degraded soil showed that it contained Cd in significantly higher value than the permitted limit value. Other elements were within the limit values permitted for agricultural land. The content of Cd in 2011 was 5.1 mg kg-1 of soil, and in 2013 it was 4.5 mg kg-1 of soil. By analyzing the composition of the green matter in mixtures I/G, II/G and IV/G, it was found that orchard grass was predominantly present in relation to other constituents of the mixture. The III/G mixture was dominated by Italian rye-grass. The participation of other plant species in the mixture was extremely low. In the green mass of all mixtures, leguminous was represented in a small percentage. The largest soil cover with plants was achieved with the mixture IV/G (88.4%), which at the same time achieved the highest average yield of green mass. The determined values of the content of microelements and heavy metals in the dry mass were within the allowed limits. Nitrates influenced the reduction of Cu and Cr content in soil and Cd content in dry plant mass.