Search

Search Results

• Vermicomposting of communal sewage sludge

  52-60

  András Csumán

  Péter Gáti

  Edit Sárközi

  Levente Kardos

  Gyula Kasza

  Views:

  121

  The proper management of communal sewage sludge is a priority aim in today’s environmental protection. Among the possible technologies one environmentally sustainable sludge treatment technology can be the vermicomposting of communal sewage sludge. Before the successful operational level vermicomposting is absolutely necessary to investigate the process of vermicomposting in laboratory controlled conditions. In our studies vermicomposting of communal sewage sludge was carried out by comparing two earthworm populations in laboratory. During 6-week experimental period the temperature (with soil thermometer) and the redox potential (with ORP portable device) were measured every other day. The weekly, measured, basis parameters were the compost visual appearance, color and smell, pH (H2O), dry matter content, organic matter content, EC (conductivity), from which the total salt content can be calculated, total nitrogen content, phosphorus content (P2O5), potassium content (K2O), calcium and magnesium content, humus content (H%), determining the humus quality according to Hargitai’s method and dehydrogenase enzyme activity. It can be concluded from the results that the vermicomposting of studied communal sewage sludge has started and keeps going. The basic physical and chemical parameters (e.g. temperature, humus quality and quantity) support the changes. The results of humus quality and quantity which are priority variables of agriculture use show average increasing despite the initial recession. The changes of the important chemical parameters (nitrogen, phosphorus, potassium) in nutrient management were developed favorably. In our presentation the previous laboratory results are described.

• “The earthworm is the best workmate of the farmer”– or beneficial effect of minimal soil disturbance on soil structure

  250-258

  Attila Barczi

  Tamás Harrach

  Valéria Nagy

  Views:

  114

  In recent decades in Germany the soil structure is greatly improved on a substantial part of the  rable land. Soil erosion can be observed less commonly. Since the 1970s in Germany the intensity of soil disturbance is significantly reduced. The less disturbed soil has more mechanical load, namely the stability. The perforated structure with stable biopores ensures ecological functions, such as infiltration, aeration, root permeability, fertility. For this reason, soil compaction and soil erosion occur less frequently, they can be detected only in exceptional cases. But in Hungary, the same can not be said therefore it is a desirable objective to explore the cause of differences. Usually the best soil structure can be found on the arable lands without rotation cultivated. In Germany we could study the condition of soils in farms which using no-till system. We have analyzed the effect of soil cultivation methods on the soil structure.