TY - JOUR AU - Szabó, Fruzsina Magdolna AU - Rédei, Károly Miklós AU - Ábri, Tamás AU - Kovács, Elza AU - Juhász, Lajos TI - Stand structure of a juvenile Paulownia Shan Tong plantation grown in the temperate dry climate zone, in Hungary - A case study JF - JOURNAL OF FOREST SCIENCE J2 - J FOREST SCI VL - 69 PY - 2023 IS - 12 SP - 550 EP - 556 PG - 7 SN - 1212-4834 DO - 10.17221/90/2023-JFS UR - https://m2.mtmt.hu/api/publication/34315386 ID - 34315386 AB - In this paper, empirical relationships between diameter at breast height (DBH), crown diameter (CD), and stem number per hectare (N) were improved in a Paulownia Shan Tong plantation. Various functions of these variables were defined, focusing on growing space (Gs) and stem number per hectare. The linear crown index between CD and DBH seems to be particularly important in predicting stem number per hectare. Based on an analysis of the relationships, a CD-DBH (R2 = 0.7254) and a DBH-N graphic model (R2 = 0.7302) can be applied widely in plantation forestry. Under suitable site conditions, the investigated Paulownia hybrid can provide a higher increment in DBH than most of poplar hybrids at a certain age. The aim of this study was to explore the relationships between the Gs based on CD and DBH. These types of investigations are of fundamental importance in terms of the growing technology of tree plantations. LA - English DB - MTMT ER - TY - CHAP AU - Huzsvai, László AU - Kovács, Elza AU - Juhász, Csaba TI - Gabonafélék termés-előrejelzése T2 - Minőségvizsgálattól az élelmiszerbiztonságig PB - Debreceni Egyetem Mezőgazdaság-, Élelmiszertudományi és Környezetgazdálkodási Kar CY - Debrecen SN - 9789634905257 PY - 2023 SP - 86 EP - 93 PG - 8 UR - https://m2.mtmt.hu/api/publication/34168867 ID - 34168867 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Ábri, Tamás AU - Borovics, Attila AU - Csajbók, József AU - Kovács, Elza AU - Koltay, András AU - Keserű, Zsolt AU - Rédei, Károly Miklós TI - Differences in the Growth and the Ecophysiology of Newly Bred, Drought-Tolerant Black Locust Clones JF - FORESTS J2 - FORESTS VL - 14 PY - 2023 IS - 9 PG - 19 SN - 1999-4907 DO - 10.3390/f14091802 UR - https://m2.mtmt.hu/api/publication/34125020 ID - 34125020 AB - In this study, the growth and physiological performance of four newly bred black locust (Robinia pseudoacacia L.) clones (‘NK1’, ‘NK2’, ‘PL040’, ‘PL251’) together with one registered in Hungary (‘Üllői’) were monitored and compared in a field experiment located in the dry temperate climatic zone of Eastern Central Europe. Tree height and diameter at breast height were measured monthly during May–August 2022, an extremely dry period. Ecophysiological parameters such as leaf temperature, vapor pressure deficit, intercellular carbon dioxide level, transpiration and assimilation rates, and stomatal conductance to water and CO2 were measured in situ. There was a high clonal effect on survival rate and growth of the trees and on the physiological parameters. ‘NK1’ performed best regarding height (1.88 m), while ‘PL040’ (23.76 mm) had the highest diameter increment (n = 16–26). The highest carboxylation efficiency was found in ‘NK2’ (0.077 µmol m−2 s−1), while the lowest was in ‘NK1’ (0.035 µmol m−2 s−1), not showing a significant difference from the ‘Üllői’. Water-use efficiency values were found to be the highest in ‘NK2’ and ‘Üllői’ (4.92 and 4.78 kg m−3, respectively). Ci was found to be maximum in ‘NK1’ and ‘PL040’ (286.15 and 287.37 µmol mol−1, respectively), while it was minimum in ‘Üllői’ (248.30 µmol mol−1). Physiological parameters were found to be significantly different in the clones due to their genetic differences. A strong positive correlation was found between the transpiration and the assimilation rates (r = 0.843–0.994). Within the growing period, the loss of leaves due to abiotic stress was 0 for ‘NK1’ and negligible for the others. ‘NK2’ stood out among the other clones in most of the parameters tested (height, thickness, assimilation, WUE). In addition to its high photosynthetic intensity, its water-use efficiency was also high. LA - English DB - MTMT ER - TY - JOUR AU - Tamás, András AU - Kovács, Elza AU - Horváth, Éva AU - Juhász, Csaba AU - Radócz, László AU - Rátonyi, Tamás AU - Ragán, Péter TI - Assessment of NDVI Dynamics of Maize (Zea mays L.) and Its Relation to Grain Yield in a Polyfactorial Experiment Based on Remote Sensing JF - AGRICULTURE-BASEL J2 - AGRICULTURE-BASEL VL - 13 PY - 2023 IS - 3 PG - 17 SN - 2077-0472 DO - 10.3390/agriculture13030689 UR - https://m2.mtmt.hu/api/publication/33702903 ID - 33702903 AB - Remote sensing is an efficient tool to detect vegetation heterogeneity and dynamics of crop development in real-time. In this study, the performance of three maize hybrids (Fornad FAO-420, Merida FAO-380, and Corasano FAO-490-510) was monitored as a function of nitrogen dose (0, 80 and 160 kg N ha−1), soil tillage technologies (winter ploughing, strip-tillage, and ripping), and irrigation (rainfed and 3 × 25 mm) in a warm temperature dry region of East-Central Europe. Dynamics of the Normalized Difference Vegetation Index (NDVI) were followed in the vegetation period of 2021, a year of drought, by using sensors mounted on an unmanned aerial vehicle. N-fertilization resulted in significantly higher NDVI throughout the entire vegetation period (p < 0.001) in each experimental combination. A significant positive effect of irrigation was observed on the NDVI during the drought period (77–141 days after sowing). For both the tillage technologies and hybrids, NDVI was found to be significantly different between treatments, but showing different dynamics. Grain yield was in strong positive correlation with the NDVI between the late vegetative and the early generative stages (r = 0.80–0.84). The findings suggest that the NDVI dynamics is an adequate indicator for evaluating the impact of different treatments on plant development and yield prediction. LA - English DB - MTMT ER - TY - JOUR AU - Juhász, Csaba AU - Huzsvai, László AU - Kovács, Elza AU - Kovács, Györgyi AU - Tuba, Géza AU - Sinka, Lúcia AU - Zsembeli, József TI - Carbon Dioxide Efflux of Bare Soil as a Function of Soil Temperature and Moisture Content under Weather Conditions of Warm, Temperate, Dry Climate Zone JF - AGRONOMY (BASEL) J2 - AGRONOMY-BASEL VL - 12 PY - 2022 IS - 12 SN - 2073-4395 DO - 10.3390/agronomy12123050 UR - https://m2.mtmt.hu/api/publication/33292087 ID - 33292087 AB - It is difficult to estimate the contribution of individual sources to the total CO2 efflux from soil with vegetation. Long-term experiments with bare soil will provide useful conclusions. In this study, we aimed to mathematize the effect of soil temperature and soil moisture content on bare soil CO2 efflux in a four-season semiarid region to assess the adequacy of different models and to enable future predictions by seasons. We proved that the exponential model adequately described the relationship between the CO2 efflux and the soil temperature. The model calculations showed no significant relationship in the case of an additional quadratic exponential function, while, in the case of the linear model, the homoscedasticity criteria were not met, and the accuracy of the estimation was found to be dependent on the level of CO2 efflux. When the soil moisture content with either an exponential function or power was added to the exponential formula, the models did not provide more accurate results. Our findings confirm that the best-fitting models are dependent on the local environmental conditions, and there are areas in which the moisture content does not significantly affect the CO2 efflux of bare soil. Using trends in historical hourly temperature data in the exponential model, the CO2 emission was estimated to be in the range 772–898 g m−2 y−1 in 2050 in the location we used. Trends in climate change are expected to have considerable effects on the processes that govern the CO2 emissions of soil. LA - English DB - MTMT ER - TY - CHAP AU - Huzsvai, László AU - Zsembeli, József AU - Kovács, Elza AU - Juhász, Csaba ED - Balláné Kovács, Andrea ED - Kocsisné, Demjén Ágnes TI - Az egyre szélsőségesebb időjárás hatása az őszi búza terméshozamára hazánkban T2 - Az agrokémia, talajtan és a kapcsolódó tudományok időszerű kérdései : Jubileumi kiadvány PB - Debreceni Egyetem Mezőgazdaság-, Élelmiszertudományi és Környezetgazdálkodási Kar CY - Debrecen SN - 9789634904717 PY - 2022 SP - 150 EP - 159 PG - 10 UR - https://m2.mtmt.hu/api/publication/33287376 ID - 33287376 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Huzsvai, László AU - Bodnár, Emil AU - Kovács, Elza AU - Zsembeli, József AU - Harsányi, Endre AU - Juhász, Csaba AU - Szőke, Szilvia TI - Mathematics of the Relationship between Plant Population and Individual Production of Maize (Zea mays L.) JF - AGRONOMY (BASEL) J2 - AGRONOMY-BASEL VL - 12 PY - 2022 IS - 7 SP - 1602 SN - 2073-4395 DO - 10.3390/agronomy12071602 UR - https://m2.mtmt.hu/api/publication/32916365 ID - 32916365 LA - English DB - MTMT ER - TY - JOUR AU - Elbeltagi, Ahmed AU - Nagy, Attila AU - Mohammed, Safwan AU - Pande, Chaitanya B. AU - Kumar, Manish AU - Bhat, Shakeel Ahmad AU - Zsembeli, József AU - Huzsvai, László AU - Tamás, János AU - Kovács, Elza AU - Harsányi, Endre AU - Juhász, Csaba TI - Combination of Limited Meteorological Data for Predicting Reference Crop Evapotranspiration Using Artificial Neural Network Method JF - AGRONOMY (BASEL) J2 - AGRONOMY-BASEL VL - 12 PY - 2022 IS - 2 SN - 2073-4395 DO - 10.3390/agronomy12020516 UR - https://m2.mtmt.hu/api/publication/32696399 ID - 32696399 LA - English DB - MTMT ER - TY - JOUR AU - Kovács, Elza AU - Juhász, Csaba TI - Agrárfelsőoktatás magas színvonalon. Sikeresen zárul az EFOP-3.4.3-16-2016-00021 számú, „A Debreceni Egyetem fejlesztése a felsőfokú oktatás minőségének és hozzáférhetőségének együttes javítása érdekében” című projekt. Az agrárfelsőoktatásban markánsan megjelenik a gyakorlatorientált szemlélet. JF - AGRÁRIUM J2 - AGRÁRIUM VL - 1 PY - 2022 SP - 30 EP - 31 PG - 2 SN - 1215-8380 UR - https://m2.mtmt.hu/api/publication/32671567 ID - 32671567 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Huzsvai, László AU - Zsembeli, József AU - Kovács, Elza AU - Juhász, Csaba TI - Response of Winter Wheat (Triticum aestivum L.) Yield to the Increasing Weather Fluctuations in a Continental Region of Four-Season Climate JF - AGRONOMY (BASEL) J2 - AGRONOMY-BASEL VL - 12 PY - 2022 IS - 2 SP - 314 SN - 2073-4395 DO - 10.3390/agronomy12020314 UR - https://m2.mtmt.hu/api/publication/32622482 ID - 32622482 AB - Wheat is grown in the largest area in the world as well as in Hungary. Globally, the yield is predicted to decrease due to climate change; however, technological development can potentially compensate for it. In this study, the contribution of climatic and technological trends to the change in winter wheat yield in four sub-regions of Hungary with considerable spatial and temporal variations in weather conditions was evaluated. Long-term trends in both the weather conditions and the technology development, with the consideration of the socio-economic circumstances, were identified. For future yield prediction, non-climatic influences and critical climatic factors, as well as sensitivity in the phenological stages, were considered. In the past 50 years, the average yield variation was lower at regional than country scale. Winter wheat yield was not found to be sensitive to temperature, global degree days, precipitation, and climatic water balance, only to heat stress. Considering the technological development and the heat stress during the critical weeks in the last 30 years, an increase of yields can be expected by 2050 in Hungary's western regions (0.72-1.55 t ha(-1)), while yield depression is predicted (0.27-0.75 t ha(-1)) in the eastern regions compared to the values estimated for 2019, +/- 1.5 t ha(-1) within a 95% confidence interval. We proved that yield estimations can show contradictory changes by sub-regions of an agricultural region if the contribution of site-specific technology development, the dominant weather stressor, and the most sensitive phenological phase is involved in the statistical analyses. Identification of the dominant climatic stressor(s) for the different crops is necessary to keep high yield or even increase it under the changing environmental circumstances. Our findings suggest that heat stress is the main concern to maximize winter wheat production in temperate climate zones. LA - English DB - MTMT ER -