Faculty of Agricultural Sciences and Food

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    Influence of the fertilizers Slavol and Biohumus on potato leaf area and stomatal density
    (University of Kragujevac - Faculty of Agronomy, Čačak, 2020)
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    Dimovska, Daniela
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    Iljovski, Igor
    Different types of fertilizers, such as chemical fertilizers, organic fertilizers and natural fertilizers are available on the market. The type of fertilizer has a large impact on the plant production quality. The aim of this study, which was conducted in field conditions in the village Jurumleri, near to Skopje, North Macedonia, was to investigate the influence of the application of two different types of fertilizers on leaf area and stomatal density in potato. The influence of microbiological fertilizer Slavol and organic fertilizer Biohumus was investigated. Also, a control plot without any fertilizer was used. A statistically tool (ANOVA test) was used for data analyses. From the results, it can be concluded that the statistically highly significant difference were found between average leaf area of plants treated with Slavol and plants treated with Biohumus (p<0.001). Also, statistically highly significant difference between plants treated with Slavol and control plants regarding total stomatal density was detected (p<0.001). Between plant treated with Slavol and plants treated with Biohumus was noticed statistically very significant difference (p<0.01). It can be concluded that the microbiological fertilizer Slavol showed better results than Biohumus in our research.
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    Bacillus spp. strain-induced modulation of stomatal density in parsnip (Pastinaca sativa L.) and associated soil microbiological responses
    (Faculty of Agronomy Čačak, 2025)
    Atanasova-Pancevska, Natalija
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    Todevska, Daniela
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    Kostandinovska, Sofija
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    Kovacevik, Biljana
    Reducing chemical pesticide use and adopting biological alternatives are key priorities in sustainable horticulture. This study compared the effects of chemical and biological treatments on stomatal density in parsnip (Pastinaca sativa L.) and evaluated associated soil microbiological changes. Field trials near Skopje included a control (untreated) plot and three treatments: (T1) foliar application of Ridomil Gold MZ 68 WG (40 g/kg metalaxyl-M + 640 g/kg mancozeb), (T2) Bacillus velezensis strain B-98, and (T3) Bacillus amyloliquefaciens strain B-62. Stomatal density was determined microscopically on both leaf surfaces, and soil microbial communities were quantified before and after the growing season. ANOVA revealed highly significant differences (p < 0.001) in lower epidermal stomatal density between the control and all treatments, with T3 exhibiting the highest value (1552 stomata/mm²). Biological treatments also increased beneficial soil microorganisms, including nitrogen-fixing and cellulolytic bacteria. The results highlight B. amyloliquefaciens strain B-62 as a promising biopreparation for enhancing physiological traits and soil health in sustainable parsnip production.