Western Carpathians are historically the northern range traditional grapevine growing areas since the Middle Ages. The mean anual temperature has increased by about 1.1 o C during the last century in Slovakia. Elevated temperature impacted the growing conditions of grapevine. Together with the increased temperatures, higher frequency of drought periods and parameters are evident. Traditional grape producing areas are facing new challenges. Except for the accelerated grapevine phenology, pathogene infection pressure and occurence of pests including new ones, as well as the quality of grapes influencing wine quality, are changing. In order to evaluate the drought impact on the quality parameters of grapes the locality of the Cultivar Testing Station in Dolné Plachtince which belongs to the Central Slovakian grape producing region was chosen. Interanual variability of the drought impact on the grape quality was evaluated according to Palmer drought severity index (PDSI). The 1990-2014 period was used as a basis for evaluation. The period with the phenological phase crucial for the grape quality formation was determined. Two groups of cultivars with different ripening periods were selected. Pinot Gris, Muscat Ottonel Weiss, Müller Thurgau represented the early ripening cultivars (OIV earliness code 4 and 5), whereas Grüner Veltliner, Riesling, Welschriesling represented the late ripening cultivars (OIV code 8 and 9) were used. The cumulative values of PDSI for the crucial periods were calculated. The PDSI values as well as the sugar and acid contents were correlated to find the strength of relation between them. Short drought periods did not influence the grape quality significantly, while long drought periods caused a decrease of the acid content and an increase of the sugar content. Though the tendency was clear, the correlation level was mostly low. The most sensitive period in this sense was July-September; however, it was influenced by the ripening term of individual cultivars. The results suggest the necessity of a thorough approach to cultivar selection, taking into account its vitality and ability to preserve a satisfactory acid content in grapes by the harvest date.

The paper deals with identification of drought in western Slovakia, which is based on soil-climatological data. For this purpose, three sites were chosen: Bratislava, Piešťany and Hurbanovo, situated on the Danubian Lowland. The Palmer Drought Severity Index (PDSI) was calculated on monthly basis for time series 1981–2010, 2021–2050 and 2071–2100. There were determined the driest periods by percentage of dry months for each site. The driest period in Bratislava and Hurbanovo was in the first evaluated time series. In Piešťany we can expect, that the second time series will be the driest. Linear trend of drying area will be revealed in period 2071–2100 for all three sites. The aim of the paper is to analyze and compare the occurrence of drought in temporal and spatial dimensions on the west part of Slovakia.

The paper deals with the evaluation of agricultural drought in Slovakia by remote sensing data. For this purpose, monthly normalized difference vegetation index (NDVI) values were derived from MODIS spectroradiometer at district level during the time period of 2000 to 2014. Verification was based on correlations with the Palmer drought severity index (PDSI) for twelve sites selected according to limited climatic parameters. Correlations showed a strong relationship (α ≤ 0.1) between NDVI and PDSI values, mainly in the middle of the growing season (June to September). The aim of the paper is testing NDVI as a suitable tool for drought assessment in an agricultural land in Slovakia.

No abstract

Hlavným cieľom monografie vo väzbe na projekt bolo zhodnotiť vplyv sucha na stav vegetácie na ornej pôde a poľnohospodársku produkciu vybranej plodiny na Slovensku. Ako modelovú rastlinu sme vybrali jačmeň jarný (Hordeum vulgare L.), ktorý využíva najmä jarné zrážky. Je najrozšírenejšou jarnou hustosiatou obilninou na Slovensku a má dominantné postavenie ako ekonomicky významná jarná obilnina. Naplneniu hlavného cieľa predchádzal popis výskytu sucha na Slovensku v časovom rade 1960 – 2017 na základe meraných klimatických údajov z vybraných staníc pomocou Z-indexu. Využiteľnosť EVI ako vegetačného indexu vhodného na hodnotenie sucha sa zisťovala na základe korelácií výsledných hodnôt s hodnotami Z-indexu. Predkladaná monografia vznikla ako finálny výstup vedeckého projektu Analýza dopadu sucha na stav vegetácie v poľnohospodárskej krajine pomocou diaľkového prieskumu Zeme č. 16-GASPU-2018, riešeného na Fakulte európskych štúdií a regionálneho rozvoja Slovenskej poľnohospodárskej univerzity v Nitre s dobou riešenia od 1. januára 2018 do 31. decembra 2020.