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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
Dátum:	2015
ISSN:	1018-8851
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)
Internet cím:	Szerző által megadott URL Intézményi repozitóriumban (DEA) tárolt változat
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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
Dátum:	2015
ISSN:	2146-7072
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 Chernozem maize 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)
Internet cím:	Szerző által megadott URL Intézményi repozitóriumban (DEA) tárolt változat
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