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• Impact possibility of hedgerows on plant protection and on the yield of winter wheat

  95-101

  Péter Szarvas

  Views:

  139

  Agricultural hedgerows have various impacts on the surrounding cultivated area and on the landscape. They serve as a windbreak, help manage humidity and precipitation, and are also sources of plant species richness which can contribute to the animal biodiversity. One of their beneficial effects is the yield improvement of agricultural crops. Our investigation tries to prove this hypothesis in Hungarian circumstances in the case of several winter wheat fields near Debrecen. Regarding the results, it seems that the majority of data supports the relevant, mainly German and Austrian information, but in some cases, the correlation has not been significant.

• Monitoring the oxygen level in the Szarvas-Kákafok Deadarm

  170-173

  Gábor Csizmarik

  Ferenc Ligetvári

  Csaba Juhász

  Péter Simándi

  Views:

  58

  The water quality of the Szarvas-Békésszentandrás Dead Körös is generally meso-eutrophic, and meso-saprobic. However, particularly
  under higher temperature conditions, the water body may change toward the eutrophic state, even algal blooms could be observed
  previously.
  The present measurements were conducted during a two week period, twice a day. Three water samples were taken horizontally, from
  the surface, bottom and the middle of the water body. The samples were examined in situ. The oxygen content, the temperature, the pH and
  the conductivity were measured by potentiometric methods.
  Increasing pH was detected in correlation to the temperature, which indicated a rising photosynthetic activity. Also, the O2
  concentration showed high variations, especially, when the fresh water supply from the river was stopped, due to a small flood in the river
  Körös.
  These results indicate the increasing eutrophication processes in the deadarm, and the high load and instability of the ecosystem.