Institute of Agriculture

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Author: search.filters.author.Nedelkovski, DuskoStart date: 2022

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    Effect of foliar calcium and nitrogen treatments on yield and fruit quality of table grapes cv. Cardinal
    (Agro-knowledge Journal, 2023)
    Poposka, Hristina
    ;
    Mukaetov, Dusko
    ;
    Nedelkovski, Dusko
    ;
    Gjorgjijevska, T., Milena
    The foliar fertilization has been used as an important agrotechnical measure to avoid deficiencies and to improve quality. During the three consecutive years, a study has been performed on Vitis vinifera L. (cv. ‘Cardinal’) to examine whether a yield and grape berry quality have been affected by the foliar application of Ca and N fertilizers. A liquid mineral fertilizer containing 40% Ca(NO₃)₂ as Variant I and 31% N with 0,015 % Fe-chelate; 0,01 % Mg – chelat as Variant II (in text) has been sprayed four times during the growing period (before and after blooming, buckshot berries, and verasion). Results showed that foliar application of calcium and nitrogen increased the yield of table grapes in all three years of research, in comparison with a control variant. The highest yields of grapes in all three years of investigations were achieved in Variant II – 4.57 kg/vine (14.85 t/ha). During the tree years of investigations, the largest mass of grape bunch and berries were recorded in Variant II (382g and 368.68g), while the lowest cluster weight was in the control variant (344g and 330.92g). With a reference to the mechanical properties of the grape berries, the highest resistance to pressure (2229.70g) and breaking resistance (364.52g) were found in Variant I, treated with Ca fertilizer. The foliar application significantly affects the mechanical properties (resistance of the berry to pressure and breaking), especially in Variant I. The application of different types of foliar fertilizers did not have any significant effect on sugar contents and total acids, compared with the control variant.
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    Determination of some parameters in wine produces from clone and population of Vranec variety vines
    (Journal of Agricultural, Food and Environmental Sciences, 2022)
    Taseska-Gjorgjijevska, Milena
    ;
    Nedelkovski, Dusko
    ;
    Dzoljevska-Milenkovska, Roze
    ;
    Poposka, Hristina
    Vranec variety is the most planted red grape variety in our country for production of high quality wine. This investigation was carried out on two vineyards, one with clone material and the other with population indigenes for old Macedonian vineyards. Both were located in Gevgelija - Valandovo region with sub-mediterranean clime conditions. The scope of this investi gation is to determine some chemical parameters that influence on the quality of wine, as alcohol strength, specific gravity, total extract, total acids, volatile acids, pH, free and total SO2. Also, the content of total phenols, total anthocyanins, hue, intensity and percent of red, yellow and blue color were analyzed. Five wine experts were involved for the sensory descriptive evaluation of the investigated wines and the results were presented on spider chart.
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    Effect of foliar calcium and nitrogen treatments on yield and fruit quality of table grapes cv. Cardinal
    (Agro-knowledge Journal, 2023)
    Poposka, Hristina
    ;
    Mukaetov, Dusko
    ;
    Nedelkovski, Dusko
    ;
    Gjorgjijevska, T., Milena
    Spatial assessment of key soil properties is a basic prerequisite for the evidence-based decision making and sustainable use and management of soil. The aim of this work was to estimate the spatial distribution of SOC under different types of land use, by the means of Digital Soil Mapping techniques. A site-specific soil data collection for the Ohrid valley was integrated with continuous and discrete datasets of environmental covariates, serving as predictors. The selected test area outlines the variability of factors influencing the SOC content and spatial distribution. Soil sampling locations were randomly distributed within a predefined mesh with a 1-sq.km spatial resolution and further stratified to outline different types of land use within each mash square. Soil samples were collected from 93 locations at three depths,each 20 cm apart,covering the total area of 10 thousand ha of arable land, forestland,and land under natural vegetation. A set of additional environmental dataset was collected, namely the soil map, land use map, geology map, digital terrain model and its erivatives, satellite images, climate data,as well as a set of indices NDVI, SAVI, BI etc., developed from the remote sensing datasets. Multiple linear regression was used for evaluating the regression pattern between the environmental predictors and the target variable. To estimat e spatia l variability,several regression tree methods were used. The results obtained using this approach have given a better spatial overview of the most vulnerable areas regarding SOC depletion.Out of 21 locations examined, the content of soil organic carbon in the top layer (0- 20 cm.) of forestland was on average 6.81%, while at 22 locations examined under grassland, the average content was 4.07%. The arable land, which is under continuous human impact, had the lowest content of SOC of 2.5% under field crops and 2.61% under perennials
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    Copper monitoring in vineyard soils of the Tikvesh region, North Macedonia
    (Agro-knowledge Journal, University of Banjaluka, Faculty of Agriculture, 2022)
    Poposka, Hristina
    ;
    Mukaetov, Dusko
    ;
    Cvetkovic, Julijana
    ;
    ;
    Tasevska G., Milena
    This research studies the copper contents in vineyard soils under vineyards affected by the long-term use of copper-based fungicides and evaluates the extent of this influence on the super accumulation in the main vineculture growing regions in North Macedonia. The soil samples were taken from individual vineyards located in the Tikvesh region, from two depths: 0-30 and 30-60 cm. At the same time, control samples were collected from each of the visited sites. The control samples were taken from untreated nearby locations under natural conditions in order to determine the background concentrations. The available copper (Cu) contents were analysed on soil samples taken from 100 locations, 50 of which represent vineyard soils (organic and conventional farming) and 50 control samples from nearby forests and sites. The main finding is that the average available copper concentrations are significantly higher in soils under vineyards, compared to the background concentration in control samples, especially in these with organic farming where the use of copper-based fungicides is more intensive. A comparison of the copper contents in vineyards to the background concentrations of control samples clearly confirmed the anthrophogenic influence. A significantly very high level of copper (10.70-18.77 mg/kg) was measured in the soil samples from organic farming. The control samples contained a significantly lower concentration of copper, between average 1.39-1.62 mg/kg (0-30 cm) and 0.68-0.88 mg/kg (30-60 cm). According to the micro nutrient rating as related to a soil test with the DTPA extraction reagent (Jones, 2001) applied in this study, a significant potential ecological risk has been noticed in the agricultural soil samples (organic and conventional production).