Andmebaasi logo

Sirvi Autor "Zadayan, M.H." järgi

Nüüd näidatakse 1 - 3 3
  • Pisipilt
    Kirje
    Assessment of the spatiotemporal changes of saline-alkaline soils using GIS and, geospatial technologies methods: a community case study
    (Estonian University of Life Sciences, 2025) Markosyan, A.O.; Zadayan, M.H.; Azgaldyan, G.; Baghdasaryan, S.K.; Kroyan, S.Z.; Markosyan, S.A.
    Currently, in many countries, soil salinization is recognized as one of the primary land degradation processes, particularly in arid regions, where it significantly limits soil fertility and worsens ecological conditions. The widespread occurrence of solonetzic soils, including soda-type saline-alkaline soils, along with the intensification of salinization under changing climatic conditions and anthropogenic pressure, highlights the urgent need to update data on their distribution and expansion trends. This study, conducted between 2020 and 2022, presents the results of a survey of 600 hectares of saline soils in the Mrgashat settlement, Armavir Region, Republic of Armenia (center coordinates: 44° 5′ 14.36″ E, 40° 7′ 14.57″ N). A quantitative and qualitative assessment of the current state was carried out using GIS and remote sensing data, alongside soil sampling from six designated points. Newly salinized areas over the past 10 years were mapped, and the dynamics and direction of salinization were analyzed. The validity of the findings was corroborated by field survey data and relevant statistical indicators. The results indicate a clear trend of spatial and temporal expansion of salinized soils. Over the last two decades, the total salinized area has increased by 54 hectares, representing a 10.1% growth.
  • Pisipilt
    Kirje
    Influence of fertilization on yield, nutritional and qualitative characteristics of potato tubers under different agro-climatic conditions in Armenia
    (Estonian University of Life Sciences, 2025) Markosyan, A.O.; Zadayan, M.H.; Baghdasaryan, S.K.; Kroyan, S.Z.; Markosyan, S.A.; Gasparyan, G.H.
    This study investigates the effects of mineral (N150P120K120, ‘Control-Treatment 1’) and organo-mineral fertilization (with 20 t ha⁻¹ of farmyard manure (FYM), ‘Treatment 2’, and 40 t ha⁻¹ of FYM, ‘Treatment 3’) on the yield, nutritional value, and quality of potato (Solanum tuberosum L.) tubers under different agro-climatic conditions in Armenia. Field trials were conducted in two contrasting regions: Dasht village (Ararat Plain, 850 m a.s.l.) with cultivated irrigated meadow-fulvous soils, and Vahan village (Gegharkunik Highlands, 2000 m a.s.l.) with mountain black soils (chernozems). The research measured tuber yield, dry matter, starch, vitamin C, and protein content over three years (2019–2021). Application of T3 (NPK + 40 t ha⁻¹ FYM) significantly improved all measured indicators. Yield increased by up to 28%, dry matter by 10.8%, starch by 12.0%, vitamin C by 13.4%, and protein content by 14.4%. Climate conditions also had a significant impact on tuber productivity and composition. In chernozems, compared to irrigated meadow-fulvous soils, yield increased by 15.1–21.6%, and the content of dry matter, starch, and vitamin C increased by 3.1–8.7%. However, protein content was higher in the irrigated meadow-fulvous soils by 3.4–5.2%. These results demonstrate the importance of fertilization strategies tailored to specific agroecological zones and climatic trends, particularly in the context of climate change adaptation.
  • Pisipilt
    Kirje
    Milk productivity, reproductive performance, hematological and clinical indicators of holstein, brown swiss, simmental, and jersey breeds of cows under Armenian agro-climatic conditions
    (Estonian University of Life Sciences, 2025) Minasyan, L.M.; Vardanyan, H.R.; Chitchyan, Zh.T.; Zadayan, M.H.; Simonyan, J.T.; Shahazizyan, N.A.; Mirzoyan, M.S.; Simonyan, L.L.
    The research was conducted on the farms of ‘Himnatavush’ Foundation and ‘Agroholding Armenia’ LLC in the Tavush and Lori regions of the Republic of Armenia. This study aims to fill a research gap regarding the adaptability of elite dairy breeds in the South Caucasus under variable agro-climatic conditions. The scientific and practical goal of the work is to conduct, for the first time, a comparative study of the milk productivity, reproductive capacity, and hematological and clinical indicators of Holstein, Brown Swiss (Schwyz), Simmental, and Jersey cattle breeds imported into the Republic of Armenia from various European countries in recent years, as well as cows born and raised locally (local reproduction). The study is being carried out in two farms located in different agro-climatic zones of the Republic. At the farms of ‘Agroholding Armenia’ LLC and the ‘Himnatavush’ Foundation, the age at first calving of both imported full-grown cows of Holstein, Brown Swiss, Simmental, and Jersey breeds and their locally born and raised first-calf heifers corresponded to breed-specific norms. The service period for cows of all breeds exceeded the desirable range (80–90 days), ranging from 93.8 to 115.6 days. However, the reproductive capacity coefficient ranged between 92.9–97.3, which is considered a good indicator. Hematological and clinical parameters of all cows remained within physiological norms. Jersey cows exhibited slightly better adaptation markers. The study confirms the successful acclimatization of these breeds to Armenia’s diverse agro-climatic zones and supports the continued use of these high-yielding breeds for sustainable dairy development.