Janos Tamas

Janos Tamas
University of Debrecen · Department of Water and Environmental Management

PhD DSc

About

222
Publications
48,273
Reads
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666
Citations
Additional affiliations
July 1988 - present
University of Debrecen
Position
  • Professor (Full)
July 1988 - present
University of Debrecen
Position
  • Head of Department
Education
September 1995 - July 1997
UNIGIS
Field of study
  • GIS
September 1990 - July 1992
University of Debrecen
Field of study
  • Water management
September 1985 - July 1987
University of Debrecen
Field of study
  • Agrochemistry

Publications

Publications (222)
Article
In our study, the effect of fermented and specially added poultry manure products (superabsorbent polymer (SAP), bentonite and Aegis as a mycorrhizal inoculum) were investigated in a short soil incubation experiment – at 60% water capacity level - on sandy soil. Soil samples were collected from two layers of the incubation pots after the second and...
Article
Full-text available
Composting is one of the most popular recycling processes for organic waste. Composting plays an important role in waste and by-product management and is becoming increasingly important in both sustainable energy management and circular economy. Composting transforms organic matter to produce a safe and stable by-product (compost) that can be appli...
Article
In arid areas, such as Hungary, most climate models forecast a rise in water scarcity. Irrigated land accounts for 2% of agricultural land in Hungary, with most irrigation technology being relatively outdated. The aim of this research was to lay the foundation for a combined traffic management system for a water-saving precision irrigation system o...
Article
This work aims to develop a hydrological modelling tool to help managers make the right decisions for Debrecen, in the face of water scarcity and the increase in agricultural and domestic needs over time. The methodology was based on the creation of a climatic database, at monthly time steps, from 2016 to 2019, and cartographic (land use, digital e...
Article
According to the Green Deal efforts, the importance and relevance of organic fertilization will increase in the near future. Therefore, the investigation of the effects of different organic fertilizers on soil productivity and nutrient supply is a priority area of agricultural research. Organic fertilizer experiment was conducted in an eight-year-o...
Article
Full-text available
The food security with good and excellent nutrition quality and food safety with food quantity in the V4 countries is a strategic issue, where society is less tolerant of the risk that can be caused by a short-term disruption of supply chain. Climate change is leading to more extreme weather anomalies, with increasing frequency and intensive amplit...
Article
Full-text available
Reference crop evapotranspiration (ETo) is an important component of the hydrological cycle that is used for water resource planning, irrigation, and agricultural management, as well as in other hydrological processes. The aim of this study was to estimate the ETo based on limited meteorological data using an artificial neural network (ANN) method....
Article
Full-text available
Reducing the use of chemical fertilizers in agriculture is one of the EU Green Deal’s priorities. Since poultry production is increasing worldwide, stabilized poultry litter such as composted pelletized poultry litter (CPPL) is an alternative fertilizer option. On the contrary, compared to chemical fertilizers, the environmental impacts of composte...
Conference Paper
In recent years, the point measurements of water management properties have become widespread and the spatial heterogeneity of a field is important. Spectral analysis provides an opportunity to measure the water load of plants in real time under field conditions. Thus, NDVI data was recorded using different remote sensing methods and then compared...
Article
Full-text available
Due to the intensification of the poultry sector, poultry manure is being produced in increasing quantities, and its on-site management is becoming a critical problem. Animal health problems can be solved by stricter the veterinary and environmental standards. The off-site coupled industrial chicken manure recycling technology (Hosoya compost tea)...
Article
Full-text available
Due to the intensification of the poultry sector, poultry manure is being produced in increasing quantities, and its on-site management is becoming a critical problem. Animal health problems can be solved by stricter the veterinary and environmental standards. The off-site coupled industrial chicken manure recycling technology (Hosoya compost tea)...
Article
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Sunflower (Helianthus annuus L.) is one of the most important oil plants in Hungary, with a sown area of more than 627.000 ha in 2019. Sunflower cultivation is primarily important for use in the oil industry, but its role in feed and beekeeping cannot be neglected either. Sunflower adapts well to different production areas in terms of soil demand,...
Article
Full-text available
Composting is an efficient technology for the utilisation of by-products and waste. It is also suitable for treating raw materials to convert fertilisers that are not recommended for application without pre-processing. Such is the case with poultry manure, which is very important to pre-treat due to its hazardous properties. An increasingly common...
Article
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The anaerobic digestion is a well-known method in waste management of biodegradable wastes to transform waste to energy. Proper digestion requires optimal fermentation conditions to improve the quality and yield of biogas. The objective of this study was to characterize the biodegradation process of synthetic and organic wastewater. Microalgae ( Ch...
Article
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Nowadays, the development of irrigation is increasingly recognized as a necessary factor in agriculture, primarily because of global warming. Depending on the field conditions, the most commonly used method is sprinkler irrigation. The spray uniformity of sprinklers installed on the field irrigation equipment can be characterized by the Christianse...
Article
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The active biomass of cultivated plants and average yield decreases as a result of biotic and abiotic stress effect. The extent of the reduction can be quantified on the basis of remotely sensed data. The aim of this research is to evaluate the suitability of Landsat 8 data for a wheat yield estimation. We processed Landsat 8 recordings for the per...
Article
Full-text available
Due to the increasing global demand of food grain, early and reliable information on crop production is important in decision making in agricultural production. Remote sensing (RS)-based forecast models developed from vegetation indices have the potential to give quantitative and timely information on crops for larger regions or even at farm scale....
Article
Apple production accounts for 60-65 % of all fruit production in Hungary, as one of the most important areas of the fruit production sector. Extreme weather conditions in the continental climate can cause significant problems in apple production. The most important solutions to decrease their effects are irrigation and hail net. In addition to prot...
Article
Full-text available
Organic fertilizer experiment was conducted in an eight years old apple (Malus domestica Borkh.) orchard at Debrecen-Pallag. In the trial Pinova cultivar was used. In this study, two different fermented chicken manure products were added to the soil (in 20 cm depth) to test their effects on soil nutrient status, plant uptake and fruit quality. It w...
Article
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Apple production has seen a decline in yields in recent years, primarily due to ecological factors such as drought, water stress, water scarcity, uneven rainfall distribution, frost damage and hail damage. Ecological factors that are harmful to the plant can be eliminated by human intervention, irrigation or the use of hail net. In our study, we in...
Article
Full-text available
Methodological bases of an integrated urban hydrological model to support river basin management planning Abstract Freshwater is a basic need of humanity and its availability is an important factor in the formation and survival of cities. Settlements also typically developed along water bodies. It is a question how the settlements that are already...
Preprint
Full-text available
Due to increase demand of food grain in the world, assessment of yield before actual production is important in making policies and decisions in agricultural production system. For a large area, forecast models developed from vegetation indices derived from remote sensing satellite data possesses the potential to give quantitative and timely inform...
Article
Currently, predictability of weather is uncertain, resulting from increasingly variable weather conditions. Thus, crop yield forecasting based on seasonal weather information remains a challenge for the agricultural sector. In this study, non-linear regression analysis was carried out to model long-term meteorological data. To assess the predictabi...
Article
Full-text available
The treatment and utilization of plant and animal waste and by-products from agriculture is very diverse. Traditional environmental management practices for waste management have been retained through soil conservation and the applied of recycle degradable organic substances in soil. The management of by-products from agriculture (animal husbandry)...
Article
The main point of this research is to assess the applicability of condensed molasses soluble (CMS), which is an organic by-product of lysine fermentation, as an environmentally friendly complexing agent in rhizofiltration of heavy metal contaminated acid mine drainage (AMD). First the ecotoxicological properties (growth inhibition, seed germination...
Article
Full-text available
Large amount of waste and by-products generated during livestock processes requires urgent treatment and disposal. The energy recovery of wastes and by-products can be a solution for the problem, since the biogas production is an obvious way of recovery. As a by-product of biogas production biogas slurry is produced and it is to be suitable for nut...
Article
Composting is one of the most popular recycling processes for organic waste. Compost is an inherently variable product produced from a wide variety of organic source materials known as feedstocks. The aim of our research was to examine the process of composting with maturity and stability parameters. The windrow composting experiments were set up i...
Article
Full-text available
The use of both terrestrial and satellite sensors often lacks the specific knowledge that makes them more effective. There are many reasons for this, one of them is agricultural digitalization to facilitate data availability and shortened automatic spectral indexing, but interpretation requires special remote sensing and agricultural knowledge. The...
Article
Full-text available
The environmental impacts of climate change have been identified as a central issue in of the agriculture because the emergence of drought risk is a growing barrier to crop production and resulting in a decline in the quality and yield of cereals in recent years. In recent years there was a great development made in cereal processing in Hungary. In...
Article
Full-text available
Precision farming technologies increasingly appear in the livestock sector. The most precision animal husbandry innovations are in the precision breeding and nutrition, but nowadays, different robots (e.g. robotic milking systems, robotic barn cleaners, etc.) can help for effective animal production, mainly in barn. The number of such innovative so...
Article
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Rapid weather fluctuations with an increasing demand for resource use impacts crop production sustainability leading to severe use of land and water resources. Laboratory analysis and technological improvements, such as remote sensing, generate new information and knowledge, to ease the visibility of effects by agricultural practices, bringing new...
Article
A szélsőséges időjárási viszonyok miatt napjainkban az öntözést egyre szükségesebb tényezőnek tartják. A növény vízigényeinek és a rendelkezésre álló vízkészletek felmérése után dönteni kell, milyen öntözési módszert alkalmazunk. Szántóföldi körülmények között az egyik leggyakrabban használt módszer az esőszerű öntözés, melynek több típusát ismerjü...
Article
Full-text available
Meat chicken (broiler) industry continuously increasing all over the world. Due to it, the amount of waste from the chicken industry is also increasing. Therefore, more efficient conversion of chicken manure to organic fertilizer is key problem all over the world. Therefore, the aims of present study are to investigate the changes in temperature an...
Article
Full-text available
In order to reach the goal determined by the 2009/28/EU directive sorghum production for energy purposes can be an adequate method. Efficient sorghum production is based on the consideration of the climatic aspects. An advantage of sorghum is appearing in the field of drought tolerance. The foundation of sorghum’s great drought tolerance is the hig...
Article
Full-text available
In my research I observed the effects of different poultry manure pellets on germination and pigment changes in maize and wheat with breeding test. At the end of the experiments I measured the pigment and spectral data. The effect of the pellets on the pigment content was also studied by Tukey's variance analysis and I evaluated the connection betw...
Article
Full-text available
During the industrial production of broiler chicken a large amount of manure is produced, of which easily contained nitrogen content (without pre-treatment) is released into the atmosphere as an air pollutant. In our experiments we aimed to prepare compost tea, also known as water extract of compost, from pre-treated poultry manure in order to crea...
Conference Paper
Full-text available
A baromfitenyésztés fő termékein kívül jelentős mennyiségben keletkeznek olyan melléktermékek, amelyek hasznosíthatók, illetve speciális technológiával jelentős hozzáadott értéket képviselnek. A szerves hulladékok, melléktermékek kezelésének egyik leggyakoribb módja a komposztálás, mely során a hulladék, illetve melléktermék negatív tulajdonságai (...
Article
The reserves and exploitation of conventional, so-called fossil energy resources are limited, therefore the utilisation of renewable energy resources has been becoming more and more important. Present study focuses on the thermal water utilisation possibilities i.e. energy content utilisation, balneological utilisation, irrigation, and the related...
Article
Full-text available
Forest site quality evaluation is an important part of forest planning and forest management. A forest site is characterized by forest biomass, which is determined by elevation characteristics, soil type and climate. Height of tree is widely used parameter for terroir typifying, but measuring of tree height is sometimes time- and labour-consuming a...
Article
This study assessed the gross calorific values (GCV) of crop and bio-energy residues. In addition, it assessed the calorific values of sweet sorghum to clarify its potential as energy crop in the region. Furthermore, it statistically analysed the ash remaining after burning three bio-energy residues, bagasse, oil cakes and fermented sludge of bioga...
Article
Stakeholders, policy makers, government planners and agricultural market participants in Central Eastern Europe require accurate and timely information about wheat and maize yield and production. The study site, the lowlands (altitude below 200m) of the Tisza river catchment is by far the most important wheat and corn producing region in the Carpat...
Article
One option for adaptation to climate change is to grow a wider variety of plant species. Sorghum (Sorghum bicolor (L.) Moench) is known to tolerate unfavourable environmental conditions, so it may be feasible to grow it on areas with extreme conditions to replace other species such as maize. Nowadays, spatial decision supporting systems primarily s...
Article
Full-text available
In many regions of Europe (among others in Hungary) agricultural production has been affected by droughts over the past decades. Global Water Partnership (GWP) Central and Eastern Europe (CEE) wanted to supported European countries in developing of an early warning system, which consists of monitoring, prediction and combine national drought polici...
Article
Full-text available
The increased intensity of animal meat production and the large volume of adjacent livestock manure need new management technologies to fulfill the environmental requirements and convert manure for landfield application. The goals of new technologies are to standardize the nutrient stabilization, to reduce pathogens and odors. One of the main sourc...
Conference Paper
Full-text available
Production of appropriate quality and quantity horticultural products are provided by excellent agro-ecological conditions, which are derived from the location of Hungary. Harvested area of cherry production was continuously decreased form the 90s for a decade, ever since it was slightly increased or stagnated. Over the period of 2006 to 2016, the...
Article
Full-text available
Cellulose is one of the most abundant organic chemical material in the world which is a raw material for several fields. In many cases this material is appearing as residue in the agriculture and forestry. Thus the application of cellulose as secondary raw material is desirable which requires a rapid estimation method reflecting the potential amoun...
Conference Paper
Full-text available
Bevezetés A világ népességének gyarapodása várhatóan felgyorsítja az igényt a nagy mennyiségű, de jó minőségű élelmiszerek iránt, amely az iparszerű mezőgazdaság fejlődésének felgyorsulását hozza magával. Ugyanakkor ez a fejlődés magával hozza azt is, hogy az egyre intenzívebbé váló technológiák növelik a környezet terhelését és esetenként a szenny...
Article
Full-text available
Our investigation was carried out in vineyards on Nagy-Eged hill in Hungary. Grapevine growing plays an important role in EgerVine Regions. In the grapevine cultivation it becomes necessary to know the requirements of vineyards along the best geographical situationusing available cultivation and examination technology to achieve better and quality...
Article
Full-text available
In this study the transpiration properties and response to heat stress of Granny Smith and Jonagold apple species were measured.The examinations were set at an orchard near to Debrecen. The chosen trees were two years old, without fruits, in 20l container, placed inthe mixture of mulch matrix, wood chips and sawdust and grown at the same climatic c...
Article
Full-text available
One of the most important conditions of high quality fruit production is the early detection of phytopathologycal infections. Themost dangerous disease of peach (Prunus persica) is the Taphrina deformans, which causes serious damages mainly in the years where theweather condition is cool and wet. In this study, healthy and naturally diseased leaves...
Conference Paper
Full-text available
Recognizing the environmental problems of the accelerated erosion processes raises the significance of forecast beside detailed knowledge of the process. Climate change causes strengthening of Mediterranean and semi-arid character in Hungary's climate. As a consequence, soil erosion will be determined by the less frequent, short duration but high i...
Conference Paper
Full-text available
Spatial and temporal changes of the environment could be very important from different point of views. Landscape characteristics are determined by features of terrain, biomass, agricultural fields and artificial environment with roads, buildings, etc. Mapping of these elements with traditional tools and methods are costly, time consuming and someti...