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• A szervetlen-C és a szerves-C mennyiségének változása egy homoktalajban, meszezés hatására

  8-10

  Péter Tamás Nagy

  Tibor Filep

  Sándorné Kincses

  Views:

  91

  The effect of liming on different organic and inorganic carbon forms in soil was studied in a pot experiment on acidic sandy soil (pH(H2O)=4.38; pH(KCl)=3.42). We used three kinds of liming doses (which were signed M1, M2, M3,). M1 was half of the M2 dose; M2 was the calculated lime dose and M3 was one and the half dose of M2. Lime (CaCO3) was mixed into the soil in powdery form. In addition to liming treatments, a uniform N, P and K treatment (1-1-1g N, P2O5 and K2O per pot) was given. Water supply was set up to 75% field water capacity of soil. Pots were watered daily. During the vegetation period soil and plant (oats; Avena sativa L.) samples were taken from each treatment three times (after 6-10-15 weeks). We determined inorganic- and total-C of the soil by Vario EL element analyser (based on dry combustion method) and calculated the organic-C.
  The conclusions can be summarized as follows:
  – Liming treatments had a significant positive effect on the soil-pH and caused quantitative change of different carbon forms of soil.
  – Increasing tendency of liming doses caused more intensive changes in inorganic- and organic-C forms of soil.
  – A significant correlations was found between the soil pH and the inorganic-C fraction of soil.
  – A decreasing correlation was found between the vegetation period and the organic-C fraction.

• The comparison of sperm motility and density in four different goldfish (Carassius auratus) types

  135-140

  Borbála Nagy

  Gergely Bernáth

  Levente Várkonyi

  József Molnár

  Levente Zete Láng

  Tibor Izsák

  Tamás Bartucz

  István Iittzés

  Áron Ittzés

  Béla Urbányi

  Zoltán Bokor

  Views:

  125

  Different goldfish types play an important role both in ornamental fish farming and science. Considering its historical background, the goldfish is a suitable model animal for the study of artificial selection as well as for developmental biological studies. Sperm motility and cell density is an important parameter in determining sperm quality. The aim of our study was to examine the effects of different goldfish types on the sperm quality. Several sperm motility parameters (progressive motility (pMOT, %), straight line velocity (VSL, μm s^-1), curvilinear velocity (VCL, μm s^-1), linearity (LIN, %), amplitude lateral Head Displacement (ALH, μm), Beat Cross Frequency (BCF, Hz)) of four different goldfish types (Common goldfish-“wild type” N=5, Shubunkin N=4, Black Moor N=4, Oranda N=5) was compared during 60 hours (at 12-hour intervals) at refrigerated storage (4 °C). The variability of sperm density was also investigated in all types. A similar cell concentration was determined in the four goldfish variants (Common goldfish 2.01*10¹⁰ ± 3.46*10⁹; Shubunkin 1.71*10¹⁰ ± 3.25*10⁹; Black Moor 1.66*10¹⁰ ± 3.02*10⁹; Oranda 1.56*10¹⁰ ± 5.83*10⁹). Statistically significant difference between the 4 goldfish types in the motility parameters and cell density was not noted. However, a decreasing tendency in Black Moor sperm motility parameters (pMOT, VCL and VSL) was observable, as well as a reduced spermatozoa density in Oranda was also recorded. Our results can contribute to the improvement of the common hatchery propagation of goldfish. Future studies can add more evidence of the possible effects of artificial selection on the reproduction in different goldfish types.

   

• Assay of runoff conditions using a Digital Elevation Model

  124-129

  Ildikó Nagy

  Tibor Bíró

  János Tamás

  Views:

  91

  We can get information about water conditions of plane areas by analyzing their relief. By using the Digital Elevation Model, we can get proper information about runoff conditions in the terrain surface, which is the basis for ponding analysis. In our study, a Digital Elevation Model of the sample plot in Hajdúsági-löszhát (loess ridge) was created that makes possible the determination of runoff conditions of the surface. Convergence and divergence of runoff direction showed the rate of ponding and the location of possible inland-water spots. By using this model, concrete location of those areas that tend to be overmoistured could be determined. Knowledge of this phenomenon can be an effective instrument for farmers in optimizing crop growing, and additionally in performing water management interventions in proper time and space.

• Enhancement potentials for labour efficiency in small and large scale cattle farms

  70-75

  Tibor Nagy

  Views:

  67

  The author examined the possibilities of increasing the labour efficiency at 6 large-scale farms and at 109 small-scale farms in Hajdú-Bihar county. He stated that the level of labour efficiency was higher for large scale farms than for small-scale farms. However, there is potential for work organisation of milking, feeding and other jobs on the large-scale farms, too. The reason for the low labour efficiency on small-scale dairy farms is the small number of livestock, obsolete machinery, and lack of expertise. The author points out that the quality of raw milk is also an important issue. Using examination methods of work organisation, he determined the critical points of raw milk production.