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Tétel Szabadon hozzáférhető Boszorkánykörök - gyepjeink rejtett erőforrásai(2025-12-20) Balogh, János; Tóth, Adrienn; Freiler-Nagy, Ágnes; Moravszki, Letícia; Hetényi, Nikoletta; Orosz, SzilviaThis review examines fairy rings in temperate grasslands and their ecological role, highlighting their occurrence in Hungary. It presents the 92 fungal species recorded in Hungary that form these structures and provides a detailed discussion of the ecological mechanisms behind ring formation, their growth rates (which vary from 7 cm to 125 cm per year depending on the species), and the various classification systems. Their ecological role is complex and dual: some species (Type 1) harm vegetation at the fungal front (e.g., through soil hydrophobicity and phytotoxic compounds), while in the inner zone of the rings, they stimulate growth and increase diversity, partly by promoting the proliferation of arbuscular mycorrhizal (AM) fungi. Therefore, fairy ring fungi are ecosystem engineers: they fundamentally influence nutrient cycles, soil microbial communities, plant diversity, and biomass production. Some of the compounds they produce (fairy chemicals) show remarkable potential for agricultural application. Research on fairy rings – despite being crucial for understanding the functioning of grassland ecosystems – is still insufficient. An interdisciplinary approach, the application of remote sensing technologies, and the use of mathematical modelling in future research could contribute to the protection, restoration, and climate change adaptation of grasslands.Tétel Szabadon hozzáférhető Homokpuszta gyepi boszorkánykör növénytani és takarmányozási vizsgálata(2025-12-20) Balogh, János; Kárpáti , Edina; Tóth, Adrienn; Freiler-Nagy, Ágnes; Moravszki, Letícia; Hetényi, Nikoletta; Orosz, SzilviaPannonian sand grasslands represent a prominent nature conservation value, for the maintenance of which knowledge of appropriate grassland management practices is indispensable. Our research investigated the complex effects of a phenomenon known as fairy rings – specifically, rings formed by Agaricus xanthodermus – which transform both the soil and the vegetation. In the different zones of a 14 m diameter fairy ring, we performed detailed botanical surveys using a total of 288 quadrats, each 0.5 m×0. 5m in area. These were evaluated using Borhidi's ecological indicators and the Balázs method for estimating yield and fodder value. The fairy ring exerts a dual, spatially distinct effect on the vegetation. Intensive nitrogen mobilisation occurred at the fungal front, leading to the rapid dominance of the nitrogen-demanding, ruderal species Elymus repens. The characteristics of this zone included a steep increase in total cover, a drastic decrease in diversity, and a decline in the vegetation's naturalness value. Moving inwards from the ring, the effect weakened; regeneration was taking place, where the fodder-valuable Poa angustifolia dominated, resulting in the highest fodder value (K-value) in the central part of the ring. However, diversity remained low here as well, due to monodominance. In summary, it can be concluded that the A. xanthodermus fairy ring functions as an ecosystem engineer, generating significant spatial heterogeneity in the grassland. Based on our results, a comprehensive assessment of the effects of fairy rings is essential to develop sustainable management and conservation practices for Pannonian grasslands, with particular regard to the balance between forage production and biodiversity.Tétel Szabadon hozzáférhető Investigations of Thrips tabaci and Aeolothrips intermedius population dynamics in tobacco plantations(2018-06-30) Orosz, Szilvia; Bujdos, László; Varga, Lajos; Fekete, TiborStudies were conducted between 2015 and 2017 with yellow sticky traps in seven tobacco plantations. The purpose was to determine when and in what numbers onion thrips individuals can settle into tobacco plantations. The primary objective of the study was to determine the proper timing of chemical treatments, furthermore, the determination of crucial factors that can influence the population dynamics of Thrips tabaci.Tétel Szabadon hozzáférhető Melyek lehetnek az alföldi szélsőségesen száraz gyepekben, takarmánybázist adó gyepgazdálkodási és állategészségi szempontból fontos pázsitfüvek?(2025-12-20) Balogh, Dániel; Szabó-Szöllösi, Tünde; Freiler-Nagy, Ágnes; Moravszki, Letícia; Hetényi, Nikoletta; Orosz, SzilviaThe Festuca taxa of the Pannonian Basin are beautiful examples of environmental adaptation to specific climatic and soil conditions and genetic diversity within the plant genus. They are well adapted to grazing agriculture and summer droughts, after which their excellent regenerative capacity helps them to recover. For these reasons, and due to their vast territorial coverage, they are also of great importance to the national economy. However, in order to exploit their genetic potential, it is essential to separate the individual taxa on a genetic basis. Taking into account two important aspects, namely coping with drought and saline soils, we provide an overview below.Tétel Korlátozottan hozzáférhető Olaszperje-gabona keverékszilázs takarmányo- zási értékének vizsgálata hazai és nemzetközi energiaértékelési adatok alapjánAlemayehu Worku Babu; Tóthi, Róbert; Orosz, Szilvia; Fébel, Hedvig; Húth, Balázs; Tóth, Tamás; egyetemi oktató, kutatóA Közép-Európai régióban az április-májusi időszakban előállított olaszperje-gabona keverékszilázsok jól beilleszthetők a szarvasmarhák és egyéb kiskérődző állatfajok (juh, kecske) takarmányadagjába. A nyári, hőstresszes időszakban e keverékek a silókukorica-szilázs részleges (pl. nagy tejtermelésű teheneknél) vagy akár teljes (pl. közepes- és kistejű teheneknél, tenyészüszőknél) helyettesítésére is alkalmasak lehetnek, főleg ha annak minősége valamilyen okból (pl. alacsony keményítőtartalom, mi- kotoxin szennyezettség) nem megfelelő. A keverékekben lévő gabonaféléknek (pl. búza, tritikálé) ked- vező a terméshozama és jó a szárazságtűrése, míg a fűfélék (pl. olaszperje) fehérjetartalmát és kiváló rostemészthetőségét kell kiemelni. Az ilyen típusú keverékek előnye főleg abban rejlik, hogy tavaszi betakarításukra hosszabb idő áll rendelkezésre, illetve a csapadékosabb időjárási körülményeket is job- ban elviselik pl. a rozshoz képestTétel Szabadon hozzáférhető Rangeland utilization by beef cattle in the dry Savanna areas of Southern Africa(2021-06-14) Danhauser, Chris; Coetzee, Roelf; Orosz, Szilvia; Hajnáczki, Sándor; Penksza, KárolyA literature review was done on the selection and utilization of grass species by beef cattle in the Limpopo province. The literature study was complimented by research done on the Towoomba Research station and the University of Limpopo, both in Limpopo Province, in South Africa. The Province is well known for its low rainfall and good quality rangeland. The main aim was to categorize the most important grass species in different utilization (palatability) classes. The thirteen grass species which were under investigation could be classified as follows: Highly palatable species: Panicum maximum and Urochloa mosambicensis; Palatable species: Digitaria eriantha, Heteropogon contortus, Schmidtia pappophoroides and Themeda triandra. Less palatable: Trachypogon spicatus and Themeda triandra and Least palatable: Eragrostis rigidior, Hyparrhenia hirta, Pogonarthria squarrosa, Melinus repens and the Aristida species.Tétel Szabadon hozzáférhető Rangeland utilization by beef cattle in the dry Savanna areas of Southern Africa(2021-09-12) Danhauser, Christiaan Stephanus; Coetzee, Ryan; Penksza, Károly; Orosz, SzilviaA literature review was done on the selection and utilization of grass species by beef cattle in the Limpopo province. The literature study was complimented by research done on the Towoomba Research station and the University of Limpopo, both in Limpopo Province, in South Africa. The Province is well known for its low rainfall and good quality rangeland. The main aim was to categorize the most important grass species in different utilization (palatable) classes. The thirteen grass species which were under investigation could be classified as follows: Highly palatable species: Panicum maximum and Urochloa mosambicensis; Palatable species: Digitaria eriantha, Heteropogon contortus, Schmidtia pappophoroides and Themeda triandra. Less palatable: Trachypogon spicatus and Themeda triandra and Least palatable : Eragrostis rigidior, Hyparrhenia hirta, Pogonarthria squarrosa, Melinus repens and the Aristida species .Tétel Korlátozottan hozzáférhető Egy vállalkozás alapításának bemutatása különösen a számviteli teendőkre vonatkozóan(2013-04-15T07:48:25Z) Orosz, Szilvia; Fazekas, Ildikó; DE--TEK--Közgazdaság- és Gazdaségtudományi KarVállalkozás működése. Indításának jogi, pénzügyi, számviteli feltételei. Számvitel története, fogalma. Számviteli információs rendszer kialakítása.Cégalapítás menete.Tétel Szabadon hozzáférhető Value in grass: Matter of fibre and carbs(2021-12-22) Halász, András; Suli, Agnes; Miko, Edit; Persovits, Edina; Orosz, SzilviaClimate adaptation is a major challenge. Chasing the sufficient amount of hay is getting in higher priority. Distant mass hay producers give favourable offers despite long distances. Quality is also gaining position and indicators like RFQ (Relative Forage Quality) is highlighting the marketing language. Hay market as we knew no longer exists in Hungary. Most farmers produce their own hay and do not spend extra cents to buy bales. Climate change however, force them to adapt and store more bales for the future. Horse owners and dairy farmers are the main driver to convince hay producers to provide high quality forage. We gathered Hungarian regional hay-price information and evaluated the trends in this sector. The demand-driven hay-price is in contradiction with premium quality timothy grass hay. JEL code: Q11