Szerző szerinti böngészés "Hoffmann, Richárd"
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Tétel Korlátozottan hozzáférhető Gondolatok a mézontófű (facélia) termesztésérőlHoffmann, Richárd; egyetemi oktató, kutatóTétel Szabadon hozzáférhető GONDOLATOK A MÉZONTÓFŰ TERMESZTÉSÉRŐLHoffmann, Richárd; egyetemi oktató, kutatóTétel Korlátozottan hozzáférhető Gondolatok a repcetrágyázáshozHoffmann, Richárd; egyetemi oktató, kutatóTétel Szabadon hozzáférhető How have thermal conditions changed in different phenological stages of apple (Malus domestica) in Northeastern Hungary?(2023-12-01) Somfalvi-Tóth, Katalin; Hoffmann, Richárd; Percze, Gabriella; Jócsák, IldikóIn temperate climates, most fruit trees need cold weather, low temperatures in winter, and a certain amount of heat during the growing season until harvest. One of the most apparent effects of climate change is the elevated temperature in all seasons of the year. In our study, the changes in thermal conditions have been calculated in Hungary's most significant growing region of apples using the Chill Unit for winters and the Growing Degree Days for summers. The meteorological data were obtained from the gridded dataset of the Hungarian Meteorological Service on a 10 km × 10 km grid, so the whole studied area is well-covered over the last 50 years. The results show that the trees are more exposed to early budding than a few decades ago. Furthermore, the accumulated heat amount in summers has increased drastically, which may increase the heat stress and lead to higher yield losses.Tétel Szabadon hozzáférhető Reaction of Ambrosia artemisiifolia L. populations to herbicides – resistance or technological fault?Kazinczi, Gabriella; Varga, Ákos; Kerepesi, Ildikó; Hoffmann, Richárd; Nagy, Margit; Bencsné Bárdi, Gabriella; egyetemi oktató, kutatóThe aim of our investigations was to search the reasons of survival of ragweed plants after herbicide treatments. Therefore ragweed achenes (later referred as seeds) were collected from those sunflower fields, which were treated with imazamox, tribenuron-methyl and glyphosate herbicides. TTC test was used to determine seed viability. Seed were sown under glasshouse conditions and their germination was evaluated continuously. Young ragweed plants were treated with normal and double dose rates of imazamox, tribenuron-methyl and glyphosate – with the same herbicides which were applied under field conditions before seed collection. Phenological and symptomatological observations were carried out continuously. 52 days after treatments the green biomass of ragweed plants was measured for each pots. It was stated that tribenuron-methyl – independently from the origin of ragweed seeds – significantly retarded the development of ragweed plants as compared to untreated control ones, but treated plants did not die. Ragweed populations showed sensitivity or moderate sensitivity to normal and double dose rates of imazamox. The effectivity of glyphosate was 100% in case of each ragweed population. Future investigations are necessary to collect seeds from the survived plants from more arable fields and to clear the reason of (partial) unefficiency of herbicides. Furthermore it is important to examine that – in case of partial unefficiency – the plants are able to flower and produce seeds which may play role in the transmission of resistance.Tétel Korlátozottan hozzáférhető Reaction of Ambrosia artemisiifolia L. populations to herbicides – resistance or technological fault?Kazinczi, Gabriella; Varga, Ákos; Kerepesi, Ildikó; Hoffmann, Richárd; Nagy, Margit; Benécsné Bárdi, Gabriella; egyetemi oktató, kutatóTétel Szabadon hozzáférhető Zselici gyepek termésének és táplálóanyag-tartalmának vizsgálata, valamint a területek földértékelése a D-e-Meter rendszerben(2021-11-14) Dér, Ferenc; Fábián, Tamás; Hoffmann, RichárdThe future way of grassland management is greatly influenced by the new functions of the grasslands relative to the environment. This means that the role of raising nutrition will be expand by the role of keeping the natural resources. In the EU the price of the arable lands are controlled by the supply and demand, so the quality of the arable and the value of it come asunder. The market economy has to evaluate the arable reliable and accurate. In according to these sentences it is necessary to show the real value of soil quality, of arable in the register of estate. An important part of the sustainable developing is to find the adaptation to the local area and the nature. This aspect could be found in the multifunctional European Agricultural model and in the rural development too. Nowadays we use the way of the land evaluation known as the “aranykorona”, which is an obstacle to the way of the sustainability. The evaluation of grasslands in Hungary is not solved, the details we have are disused, so it is hard to plan the yields of the grasslands, we can estimate them a posteriori. In the D-e-Meter grassland module we start the evaluation with the DM yield of the characteristic grass. This starting point is modified with the factors proper to the area. The measured and the estimated DM yield were compared to each other at 3 grassland at Bőszénfa. To evolve an up-to-date evaluating system we analysed grasslands at the University of Kaposvár Deer Farm at Bőszénfa to find answers to the followings: • Soil analysis of the humus, the N, P, K levels and the pH of the grasslands • Describe the botanical composition by the Balázs-method • The quality and the nutrition value of the grasslands • Yearly yields of grasslands • Analyzing of the results by the D-e-Meter system