Összesen 3 találat.


001-es BibID:BIBFORM057864
Első szerző:Kátai János (biológus, hidrobiológus)
Cím:Soil microbiological consequences of a long-term fertilization experiment in Hungary / Kátai János, Zsuposné Oláh Ágnes, Sándor Zsolt, Tállai Magdolna, Szilágyi Gergely, Vágó Imre
Megjegyzések:The result of long-term experioment in all over the world demonstrate that the fertiliztaion have direct and indirect effect on soil as a life community, mainly influence the plant population and quantity occurence and activity of soil microorganism. According to the environmental-friendly approach of the sustainable agricultural production it is very important to investigate the secondary effect of applied fertilization doses and methods in long-term fertilization experiments in order to prevent the dynamic of microbial population and fertility of soils. The obejctive of the study was to evaluate the chemical and soil microbiological consequences of a 25-year old long-term fertilization experiment, where five increasing doses of NPK-fertilizers have been applied in maize monoculture.
Tárgyszavak:Természettudományok Biológiai tudományok konferenciacikk
long-term experiment
chemical soil properties
soil microbes
parameters of C and N cycle
activity of soil enzymes
Megjelenés:The Journal of Ege University Faculty of Agriculture. - Spec. Issue (2015), p. 37-45. -
További szerzők:Zsuposné Oláh Ágnes (1949-) (agrármérnök) Sándor Zsolt (1977-) (agrármérnök, mérnöktanár) Tállai Magdolna (1982-) (agrármérnök) Szilágyi Gergely (1987-) (növénytermesztő) Vágó Imre (1953-) (vegyészmérnök)
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001-es BibID:BIBFORM057915
Első szerző:Sándor Zsolt (agrármérnök, mérnöktanár)
Cím:Effect of herbicide's ingredients on soil microbiological processes in a small plot experiment / Sándor Zsolt, Zsuposné Oláh Ágnes, Kátai János, Tállai Magdolna, Szilágyi Gergely
Megjegyzések:Pesticides play a very important role in the regulation system of weeds, but have to be counted with the secondary effect of chemicals on soil life and on the so called "not purposed" soil organisms. In this paper the objective of study was to examine the effect of two various herbicide's ingredients on some microbiological parameters of a chernozem soil (Chernozems in WRB) with loam texture. The active ingredients of herbicides are the acetochlor (Acenit A 880 EC) and isoxaflutole (Merlin 480 SC), applied in maize culture to the soil surface. The effect of the herbicides was investigated on the sensitivity and quantity change of soil microorganism and biological parameters of soil in small plot experiment. In the experiment the single, double and five time doses of the recommended herbicide doses were applied and examined on the number of total bacteria and microscopic fungi, on the quantitative changes of aerobic cellulose decomposing and nitrifying bacteria, on soil respiration, on quantity of microbial biomass carbon (MBC) and nitrogen (MBN) for four years. The laboratory examinations were carried out in the soil chemical and microbiological laboratories of Institute of Agrochemistry and Soil Science, Debrecen University. Data analysis was performed using Microsoft Excel 2003 (mean values and standard deviation). Two factors variance analysis was used to get significant effect on measured parameters. The significant differences were accepted at the level 1%, but the evaluation was calculating by the LSD5% values as accepted in the agricultural research. The various microbial groups had different sensitivity on the increasing doses of herbicides, the number of total bacteria decreased significantly, while the number of microscopic fungi and cellulose decomposing bacteria increased. The MBC and MBN increased in most of the treatments of acetochlor, but the isoxaflutole had negative effect on these two parameter. Close correlation was found between some microbial soil parameters. Both herbicides had inhibiting effect on the total soil bacteria. The quantity of microscopic fungi and cellulose decomposing bacteria increased significantly by the various doses of herbicides. CO2-production was stimulated by each treatment, except by the basic doses of herbicides. In order to choose the suitable herbicide for agricultural practice, comparative evaluation would be necessary. In summary those chemicals may be recommended for agricultural use, which cause less inhibition effect on soil microbiological parameters.
Tárgyszavak:Agrártudományok Növénytermesztési és kertészeti tudományok előadáskivonat
soil microbes
C- and N cycle of soil
MBC, CO2-production
Megjelenés:9th International Soil Science Congress on "The Soul of Soil and Civilization" : Book of proceedings / ed. R. Kizilkaya, C. Gülser. - p. 1020-1025. -
További szerzők:Zsuposné Oláh Ágnes (1949-) (agrármérnök) Kátai János (1950-) (biológus, hidrobiológus) Tállai Magdolna (1982-) (agrármérnök) Szilágyi Gergely (1987-) (növénytermesztő)
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001-es BibID:BIBFORM057914
Első szerző:Vágó Imre (vegyészmérnök)
Cím:Plant growth and potassium supply dynamics on a chernozem soil of a long-term fertilization and irrigation experiment with maize monoculture in Hungary / Vágó Imre, Sipos Marianna, Tolner László, Czinkota Imre, Szilágyi Gergely, Ibrahim Issa, Kátai János
Megjegyzések:For the plant production used soil's nutrient supplying ability ideally should correspond to the needsof the plants. The aim of our experiment work is to study as precisely as possible, how the dynamics ofgrowth and nutrient uptake of the maize plant develop during the vegetation period. For theirdetermination the basis of our research work was a long-term irrigation and fertilization monoculturemaize field experiment that has been set up in 1984 near to Debrecen, Hungary. The soil of thisexperiment is a medium-heavy, loam texture calcareous chernozem type based on loess. The deepnessof humus soil layer is between 70 and 90 cm. Its upper layer has become leached due to the intensiveproduction in the past decades, so it doesn't content any significant lime-amount. Therefore, the soil pHis slightly acidic in the production layer, which is favorable for nutrient-mobilization and -uptake. Thisfield represents the production circumstances of the chernozem soils of Hungary with excellentproductivity. Effects of three factors were studied: genotypes of maize (3), fertilizer dosages (6) andirrigation levels (2). The total number of investigated treatments (plots) was 36. Plant samples werecollected 7 or 6 times during the vegetation period, and the above-ground dry matter and the nutrientuptake of plants were determined. For characterizing and describing of the plant growth and nutrientuptake dynamics was used the so-called "S-type" (acceleration ? saturation) equation as follows:y=A/(1+exp(-k*(x-x0)))*(1-b*x), where "y" is the actual value of the measured (dependent) factor on theday "x" after plant shooting, "A" is the maximum value of "y", "x0" is the day of maximum growth rate of"y" (point of inflexion) and "b" is the rate of decreasing of dependent value for one unit. According toour results and calculations it can be concluded, that beside the previously used soil and plant nutrientcontentthe consideration and calculation of the plant-extracted nutrient-amount ? depending on theapplied hybrid and other agro-technological measurements ? is suggested in order to characterizeprecisely the nutrient-supply of maize. This parameter informs us not only about the available nutrientamountat the sampling time, but about the supply level of the plants until the sampling time as well.We suggest for sampling times the intensive vegetative growth period, the switch between the vegetativeand generative growth phases (silking), just as the grain-filling phase.
Tárgyszavak:Agrártudományok Növénytermesztési és kertészeti tudományok idegen nyelvű folyóiratközlemény külföldi lapban
biomass and potassium uptake dynamics
Megjelenés:Soil-Water Journal. - Special Issue : 1 (2015), p. 6-12. -
További szerzők:Sipos Marianna (1984-) (környezetgazdálkodási agrármérnök) Tolner László (agrár) Czinkota Imre (agrár) Szilágyi Gergely (1987-) (növénytermesztő) Issa, Ibrahim Kátai János (1950-) (biológus, hidrobiológus)
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