Scholarly record
DETERMINATION OF POROSITY OF SOILS WITH DIFFERENT SOIL TEXTURE USING TWO DIFFERENT PYCNOMETERS
Abstract
Soil and its irreplaceable functions are dependent on the soil properties. Porosity is one of the fundamental physical soil properties. It expresses the ratio between the volume of pores in the soil and the total volume of the soil in its undisturbed state. The aim of the contribution was to determine soil porosity of soil samples with different soil texture (originating in western Slovakia). Prior to porosity calculation, specific weights of dry undisturbed soil samples and bulk densities were calculated. To determine the specific weight, two different methods were used: the air pycnometer according to Langer and glass pycnometer according to Gay-Lussac. The methods differed by the way of soil sample required and its preparation prior the measurement, the time efficiency as well as the measuring principle. The calculated values of bulk density and porosity were compared to the average theoretical values established for each soil types. The calculated porosity for coarse soil samples was in the expected range of values for both methods. In the case of fine soil samples such clear results were not observed. In general, porosity calculated by the two methods was lower than the theoretical value. Results could be influenced by error at soil sampling of undisturbed samples as well as by soil compaction, which has a strong effect on the volume-mass soil relationships.
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