Szerző szerinti böngészés "Dobos, Attila"

Megjelenítve 1 - 20 (Összesen 36)
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    A környezeti tényezők hatása a normalizált vegetációs index mérésére
    (2012) Dobos, Attila; Vig, Róbert; Nagy, János
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    A referencia párolgás becslő módszereinek érzékenységvizsgálata
    (2014) Dobos, Attila; Rácz, Csaba; Nagy, János
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    A Systematic Review of the Efficacy of Interventions to Control Aflatoxins in the Dairy Production Chain-Feed Production and Animal Feeding Interventions
    (2022) Farkas, Zsuzsa; Országh, Erika; Engelhardt, Tekla; Csorba, Szilveszter; Kerekes, Kata; Zentai, Andrea; Süth, Miklós; Nagy, Attila; Miklós, Gabriella; Molnár, Krisztina; Rácz, Csaba; Dövényi-Nagy, Tamás; Ambrus, Árpád; Győri, Zoltán; Dobos, Attila; Pusztahelyi, Tünde; Pócsi, István; Jóźwiak, Ákos
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    A szülésznő szerepe mozgásukban korlátozott várandós nők szülőszobai ellátásában
    (2015) Böcskei, Anna; Lipienné Krémer, Ibolya; Dobos, Attila
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    Accuracy of Location Identification by GPS and Possibilities for its Application in Agriculture
    (2004-05-04) Pázmányi, Sándor; Dobos, Attila; Pajna, Sándor
    A description of the design and operating principle of the GPS system and the explanation of key terms of telemetric and chronometric measurements is followed by several examples characteristic of the results of factors which may influence accuracy of the identification of geographic location by satellites. In addition, results of accuracy testing of absolute GPS measurements and improvements of accuracy experienced and attributable to the alteration of the periods used for establishing average values are highlighted. Furthermore, we examined certain practical possibilities for the use of GPS systems in agriculture, emphasizing the advantages hidden in the use of GIS-GPS integration, crop mapping, soil maps and gross produce maps, in the application of the VRT (Variable Rate Technology) and in combinations of the same.
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    Comparative analysis of soil analysing datas on different sempling-plots
    (2006-05-23) Víg, Róbert; Dobos, Attila
    Hibrid maize is cultivated on larger plots, therefore the sown areas of hibrid maize are heterogeneous from a pedology aspect. Heterogenity causes problems during tasseling, chemical plant protection and harvest. The heterogenity of sown areas can be compensated by fertilization which is based on soil analysis. We carried out research into change of the soil on four soil types from 1987 to 2005. There were no significant changes in pH, hydroiodic acidity, CaCO3-content, humus-content on meadow chernozem soil. We detected equalization of salin content in the examined soil layers. There were no significant changes in the measured values on chernozem meadow soil and solonetz meadow soil in 2005. We discoverd equalization of saline content on chernozem meadow soil, but the changes were not as obvious as the changes on meadow chernozem soil. We found salinization in the 30-60 cm soil layer on type meadow soil that may be due to water movement.
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    Comparison of Several Methods for Calculation of Reference Evapotranspiration
    (2013) Rácz, Csaba; Nagy, János; Dobos, Attila
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    Describing Fusarium diseases on maize in 2013 using data from several production sites
    (2014-11-02) Szőke, Csaba; Bónis, Péter; Vad, Attila; Dobos, Attila; Micskei, Györgyi; Marton, L. Csaba
    As in other parts of the world, the frequency of weather extremes has increased greatly in Hungary in recent years. This means that maize production is faced with greater risks from all aspects: nutrient replacement, irrigation, plant protection. This is especially true of fusarium diseases. In a continental climate, the pathogens causing the most serious problems are species belonging to the Fusarium genus. They infect the ears, which – besides reducing the yield – poses considerable risk to both human and animal health due to the mycotoxins produced by them. Depending on which Fusarium species are dominant at a given location, changes can be expected in the level of infection and in the quality deterioration caused by the mycotoxins they produce. Fusarium spp. not only damages the maize ears but when pathogen attacks the stalk, the plant dies earlier, reducing grain filling and resulting in small, light ears. In addition, the stalks break or lodge, resulting in further yield losses from ears that cannot be harvested. The degree of infection is fundamentally determined by the resistance traits of the maize hybrids, but also a great role in that region Fusarium species composition as well.
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    The effect of water supply and crop year on the yield potential of sweet maize (Zea mays L. convar. saccharata Koern.) hybrids with different genotypes
    (2012-12-16) Molnár, Krisztina; Vig, Róbert; Nemeskéri, Eszter; Dobos, Attila
    The successfulness of crop production is significantly affected by not only the the average yields that provide cost effectiveness, but also the success of striving for yield safety, therefore, varieties and hybrids tolerant to environmental stress factors are worth being included into the sowing structure. Our aim was to further the decision making of producers in prepaering the right sowing structure by the evaluation of sweet maize hybrids’ tolerance to excess rainfall. We performed our examinations in an extremely wet year (2010) on chernozem soil on three sweet maize hybrids (GSS 8529, GSS 1477, Overland) in 12 replications. Comparing the yields of 2010 with those that can be expected under optimal rainfall conditions, we showed that the examined hybrids react to the amount of rainfall higher than their needs with yield depression. The excess rainfall tolerance of the examined hybrids is different in the case of each hybrid.
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    Effect of Water Supply on Spectral Traits and Their Relationship with the Productivity of Sweet Corns
    (2019) Nemeskéri, Eszter; Molnár, Krisztina; Rácz, Csaba; Dobos, Attila; Helyes, Lajos
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    Eltérő genotípusú kukoricahibridek szemtermésének szárazanyag beépülés és vízleadás dinamikája
    Dobos, Attila; Nagy, János; Növénytermesztési és kertészeti tudományok doktori iskola; DE----ATC MTK
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    Establishing regional cultivating districts on the basis of the Kreybig practical soil mapping system
    (2001-05-27) Nagy, János; Németh, Tamás; Szabó, József; Pásztor, László; Dobos, Attila
    With the help of this report evaluating the current situation of the region, characteristics of the development in agricultural production and regional differences can be clarified. By mapping out the regional soil, land use and climatic conditions and organizing these into a geographical information system, one can easily determine which plants are the most ideal to cultivate in that particular region. Moreover, it is a useful tool that enables us to establish the most favorable land use structure suited to ecological demands and also helps to determine the methods of soil protection. During our work, we chose administrative units in Szabolcs-Szatmár-Bereg County, based on the latest aspects of regional cultivation. Our pilot areas are: the small regions of Nyíregyháza, Nyírbátor, Nagykálló, Mátészalka and Csenger. Using the database, we separated and uncovered the soil conditions of the pilot areas: the chemical and physical properties of the soil layer which is exploited by the roots of the plants, the humus content, the nutrient supply, the thickness of the cultivated layer and the water management conditions. We separated the districts of regional cultivation, where the basic elements of the traditional Kreybig color systems were applied (light yellow, dark yellow, light brown, dark green, blue, pink, red, gray, greenish brown, reddish purple, light purple, dark purple, light green). By using the data collected from the pilot areas, we compiled a map database, which is suitable to illustrate the plant cultivating characteristics of the region. We made recommendations to determine the most favorable plants to cultivate in the specific region with the given meteorological and soil conditions, as well as for the shifting of crops. Our recommendations were also illustrated in a map with a resolution of 1:25000. 
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    Evaluation of the correlations between the normalized difference vegetation index (NDVI) and yield in a seasoning paprika (Capsicum annuum L. var. longum) stand
    (2014-09-18) Dobos, Attila; Víg, Róbert; Nagy, János; Takácsné Hájos, Mária
    The aim of our examination was to evaluate the correlations between the normalized difference vegetation index (NDVI) and yield, as well as to examine the possibility of yield estimation basedon NDVI in a seasoning paprika population. Significant correlations were observed during the examination of the correlation between NDVI and yield. Furthermore, it was concluded that yield can be estimated with a 6.6–8.3% mean error based on the regression equations. No significant difference was shown between the error of estimations performed with various regression types and that of the estimations performed at various dates. For this reason, the identification of the optimum estimation method and the determination of the optimum date for estimation call for further examinations.
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    Examination of soil parameters based on the evaluation of the spectroradiometric reflectance characteristics of the topsoil
    (2014-07-24) Bakos, Károly; Dobos, Attila; Nagy, János
    In this article we are presenting the methodology applied to analyse and interpret the topsoil surface reflectance parameters of multiple samples collected in the Mugello valley area in northern Italy in October 2012. The main aim of the whole project was to discover geomorphological behaviour and situation of the area ino order to improve potential for correct dating of certain archaeological artefacts found in the nearby areas. One of the crucial problem researchers are facing in the area is the lack of understanding of the underlying geological and geomorphological processes that were describing and characterizing the area and that played important role not only in the current geography and landscape formation but also in the transportation of various sediments and artefacts. In this particular research the main aim is to examine the possibility of developing a quick way to assess low level properties of the soil using hand held spectrometer and rapid analysis of cross-section using in situ measurement techniques. In this work we collected over 2000 individual samples of topsoil surface reflectance properties that we organized into a spectral library. This library is then to be used to describe physical and chemical processes in the soil. To support the analysis results were compared to analysis results from different kind of assessments in the same area. Our results show a great potential of application of hand held imaging spectrometer in soil property analysis based on the top soil surface reflectance parameters.
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    Experiences of Establishing Up-To-Date On-Site Sampler Applications
    (2005-12-06) Pázmányi, Sándor; Dobos, Attila
    Spatial problems and spatial decisions are decisive in agricultural-environmental informatics systems and the solutions require systems that can collect, evaluate and display spatial data. The distinctive features of spatial informatics systems therefore have to be considered when establishing integrated spatial informatics systems. However, the prepared spatial evaluations are not the only „added value” elements of a completed informatics system. The method of access can also speed up the work of participants and the whole system, making it more efficient with simple data-handling and the application of open standards. The significance of prepared database archives can also increase, since the accumulated data-assets are easy to utilize and become marketable.