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1.

001-es BibID:BIBFORM101821
Első szerző:Ács Gábor
Cím:Estimating soil moisture content of a grass-covered surface using an energy balance approach and agroclimatological observations / Ferenc Ács, Gábor Szász, Miklós Drucza
Dátum:2005
ISSN:0324-6329
Megjegyzések:Diagnostic applications of the energy balance equation for vegetated surface (VSEBE) are briefly summarized. We tested whether VSEBE can be successfully applied for estimating surface soil moisture content (9) in the growing season using agroclimatological observations. The analysis is performed using data set of the Agrometeorological Observatory of the University of Debrecen collected in the period 1974-1986. In the study, the process-based VSEBE model is described in detail. It is shown that VSEBE is not suitable for estimating instantaneous values of 9, since the applicability of the model is fairly limited and the scattering of the estimates is relatively large. It is also shown that monthly mean values of 8 can be estimated with acceptable accuracy applying VSEBE for a long time period. The results obtained can be useful for estimating climate characteristics of agrometeorological stations.
Tárgyszavak:Agrártudományok Növénytermesztési és kertészeti tudományok idegen nyelvű folyóiratközlemény hazai lapban
folyóiratcikk
agrometeorological station
grass-covered surface
energy balance equation
surface soil moisture content
instantaneous value of surface soil moisture content
monthly mean value of surface soil moisture content
Megjelenés:Időjárás - Quarterly Journal of the Hungarian Meteorological Service. - 109 : 2 (2005), p. 71-88. -
További szerzők:Szász Gábor (1927-) (földrajz-biológus szakos tanár, meteorológus) Drucza Miklós
Pályázati támogatás:T043695
OTKA
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2.

001-es BibID:BIBFORM014110
Első szerző:Dobos Attila (agrármérnök)
Cím:Relation analysis between biomass and yield in maize seed production / Kovács Kálmán, Dobos Attila, Víg Róbert, Nagy János
Dátum:2010
Tárgyszavak:Agrártudományok Növénytermesztési és kertészeti tudományok idegen nyelvű folyóiratközlemény hazai lapban
NGVI
climate change
remote sensing
yield estimation
crop of maize (Zea mays L.)
Megjelenés:Időjárás. - 114 : 4 (2010), p. 263-273. -
További szerzők:Vig Róbert (1977-) (agrármérnök, növényvédő szakmérnök) Nagy János (1951-) (agrármérnök, mérnök-tanár) Kovács Kálmán (1957-) (matematikus)
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3.

001-es BibID:BIBFORM117419
035-os BibID:(Scopus)85179373558
Első szerző:Gombos Béla (meteorológus)
Cím:Climate change in the Debrecen area in the last 50 years and its impact on maize production / Béla Gombos, Zoltán Nagy, András Hajdu, János Nagy
Dátum:2023
ISSN:0324-6329
Megjegyzések:The average yield of maize is significantly dependent on the meteorological conditions of the growing year. Both the most favorable weather conditions and the weather anomalies that tend to cause damage depend on the given phenophase. The aim of this research is to analyze the climatic changes that are important in maize production in the Hajdúság region. For the climatological study of the area, homogenized temperature and precipitation data from the Hungarian Meteorological Service was used for the Debrecen region, which are freely available for download from the data repository of the institution. Trend analysis was performed for the last 50-year (1973-2022) and 30-year (1993-2022) periods. In total, 40 meteorological data series matching the study objective were analyzed. Linear regression calculations were performed using the SPSS 27 statistical software. For the nonparametric procedure, the MAKESENS Excel application was used, based on the Mann-Kendall (MK) test and Sen's slope estimation. This research shows that the choice of the length of the study period affects the results of trend analysis. The numerical values of the trend slope for the 30-year vs. 50-year period differ, and for some parameters there are also substantial differences (e.g., trend sign). The results of the parametric and non-parametric trend analyses differed only marginally for the temperature variables included. Also, for precipitation data that do not follow a normal distribution (e.g., monthly), there were only a few significant differences. The trend in mean annual temperature shows an increase of 0.39 and 0.52 ?C in 10 years, and an increase of around 2 ?C in 50 years and 1.5 ?C in 30 years. There is a significant warming in both the summer and winter half-years, with the summer half-year showing a steeper upward trend in the 50-year data series and the winter half-year in the 30-year data series. There is a clear pattern of large, highly significant warming in the summer months and less significant changes in the two spring and two autumn months that were observed. A negative, non-significant trend in annual precipitation is observed. The decreases of 17 mm and 24 mm/10 years obtained for the 50-and 30-year time series are not negligible from a practical point of view. For the summer half-year, the precipitation amount is decreasing, with a slope of-27 mm/10 years for the last 30 years, but even this value is not significant due to the high variability. There is no significant change in the amount of precipitation in the winter half-year over the last decades. Significant trends cannot be detected from monthly or even semi-annual or annual precipitation data. The Mann-Kendall test showed a trend decrease only in the 30-year April data series at the p=0.1 significance level. Overall, the changes are negative for maize production. It should be highlighted that the obvious warming, combined with a slight decrease in precipitation, is leading to a deterioration in crop water availability and a reduction in crop yields. The impact of the identified adverse climatic changes can be compensated to a significant extent by the proposed agrotechnical responses.
Tárgyszavak:Agrártudományok Növénytermesztési és kertészeti tudományok idegen nyelvű folyóiratközlemény hazai lapban
folyóiratcikk
temperature
linear regression
maize production
Mann-Kendall test
precipitation
trend
Megjelenés:Időjárás. - 127 : 4 (2023), p. 485-504. -
További szerzők:Nagy Zoltán (1955-) (meteorológus) Hajdu András (1973-) (matematikus, informatikus) Nagy János (1951-) (agrármérnök, mérnök-tanár)
Pályázati támogatás:TKP2021-NKTA-32
Egyéb
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4.

001-es BibID:BIBFORM037449
Első szerző:Nagy János (agrármérnök, mérnök-tanár)
Cím:The effect of fertilization and precipitation on the yiled of maize (Zea mays L.) in a long-term experiment / Nagy János
Dátum:2012
ISSN:0324-6329
Tárgyszavak:Agrártudományok Növénytermesztési és kertészeti tudományok idegen nyelvű folyóiratközlemény hazai lapban
maize
precipitation
fertilization
long-term field experiment
Megjelenés:Időjárás. - 116 : 1 (2012), p. 39-52. -
Pályázati támogatás:TÁMOP-4.2.2/B-10/1-2010-0024
TÁMOP
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5.

001-es BibID:BIBFORM090102
Első szerző:Széles Adrienn (okleveles agrármérnök)
Cím:The effect of crop years and nitrogen basal and top dressing on the yield of different maize genotypes and marginal revenue / Széles Adrienn, Kovács Kálmán, Ferencsik Sándor
Dátum:2019
ISSN:0324-6329
Megjegyzések:The effect of the amount and application date of nitrogen fertilizer on maize productivity and profitability was examined in a field experiment established on calcareous chernozem soil at the University of Debrecen in Hungary (47o 33' N, 21o 26' E, 111 m) under different environmental conditions in the wet crop year of 2016 and the average crop year of 2017. In addition to the non-fertilized treatment, N fertilizer doses were applied in the form of basal and top dressing. The 60 and 120 kg N ha-1 treatments applied as spring basal dressing were followed by two occasions of 30 kg N ha-1 top dressing at the V6 and V12 phenophases each. The longer maturity hybrid Armagnac (FAO 490) had a better conversion ratio concerning the precipitation during the growing season of 2016 (which was higher than the 30-year average), as well as the basal and top dressing (averaged over the different treatments) in comparison with the shorter maturity hybrid Renfor (FAO 320). In the wet crop year, the yield of Armagnac was 21.7% higher, while that of Renfor was 10.4% higher. The 60 kg N ha-1 basal dressing and the +30 kg N ha-1 top dressing at the V6 phenophase (V690) resulted in more efficient uptake and better conversion rate in the rainy crop year (2016) in the case of both examined hybrids. In the average crop year (2017), a difference was observed in the successfulness of top dressing. In the case of the Armagnac hybrid (FAO 490), top dressing did not cause any significant yield surplus and the 120 kg N ha-1 basal dressing was shown to be successful. In the case of the Renfor hybrid (FAO 320), the early top dressing (V6150) applied on the basal dressing of 120 kg N ha-1 was favorable. The most favorable income of nutrient management (N) was provided by the basal dressing of 120 kg N ha-1 and the +30 kg N ha-1 (V6150) top dressing applied at the early V6 phenophase, averaged over the examined hybrids and years. In the case of the Renfor hybrid (FAO 320), the highest profitability was reached with the V6150 treatment, independently of the prevailing environmental factors. However, as regards the Armagnac (FAO 490) hybrid, the top dressing applied at the V12 phenophase provided the highest profitability, which could be achieved with the lowest dose of V12120 treatment in the wet year (2016) and the highest dose of V12180 in the average crop year (2017). Altogether, based on the results of yield and marginal revenue analysis, the recommended fertilization technology is basal dressing of 120 kg N ha-1 and basal dressing of +30 kg N ha-1 (V6150) applied at the early V6 phenophase. The obtained findings also show that the effect of N is greatly affected by crop year, genotype, and other elements of the applied technology. Also, marginal efficiency has to be defined for each hybrid, considering the given crop year, too.
Tárgyszavak:Agrártudományok Növénytermesztési és kertészeti tudományok idegen nyelvű folyóiratközlemény hazai lapban
folyóiratcikk
Megjelenés:Időjárás. - 123 : 3 (2019), p. 265-278. -
További szerzők:Kovács Kálmán Ferencsik Sándor (1987-) (környezetgazdálkodási agrármérnök, okleveles közgazdász)
Pályázati támogatás:20428-3/2018/FEKUTSTRAT
Egyéb
EFOP-3.6.3-VEKOP-16-2017-00008
EFOP
GINOP-2.2.1-15-2016-00001
Egyéb
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6.

001-es BibID:BIBFORM054111
Első szerző:Vig Róbert (agrármérnök, növényvédő szakmérnök)
Cím:The efficiency of natural foliar fertilizers / Vig Róbert, Dobos Attila, Molnár Krisztina, Nagy János
Dátum:2012
ISSN:0324-6329
Tárgyszavak:Agrártudományok Növénytermesztési és kertészeti tudományok magyar nyelvű folyóiratközlemény hazai lapban
Megjelenés:Időjárás. - 116 : 1 (2012), p. 53-64. -
További szerzők:Dobos Attila (1970-) (agrármérnök) Molnár Krisztina (1981-) Nagy János (1951-) (agrármérnök, mérnök-tanár)
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