## 3 Results and Discussion
### The Determination of Particle Size Distribution  
The results of testing the granulometric distribution of the tested organic soils (percentage content) depending on the research method used are presented in the corresponding charts. Figure 6 shows the test results obtained using the hydrometer method, while Figures 7 and 8 show the results obtained using the Analysette 22 and the Helos laser diffractometer. The samples marked with numbers 1 and 2 represent low-organic soil, samples from No. 3 to No. 7 represent medium-organic soil and the remaining ones (No. 8-12) represent high-organic soil. In this part of the discussion, the focus is mainly on presenting the percentage content of the individual fractions representing the sizes of the mineral-organic aggregates examined, called grains for the purpose of this work. The repeatability of the relationship between the fractions is also discussed, i.e., whether the same fraction always dominates and whether the remaining fractions (secondary and tertiary) occur in the same order, and the difference is only in the percentage content, i.e., whether the same tendency occurs in all methods. The tests of the particle size distribution using the hydrometer method (Figure 6) showed that in the case of soils classified as low-organic (sample No. 1 and No. 2), the primary fractions were mineral-organic agglomerates, which, in terms of size, belonged to the silt fraction (46.5-49.5%). The smallest amount of grains (the tertiary fraction) was assigned to the sand fraction (8.0-21.5%). The grain size of medium-organic soils (sample Nos. 3-7) is difficult to classify clearly: sand fraction (10.0-79.0%), silt fraction (16.5-53.0%) and clay fraction (4.5-58.0%). The high-organic soils (samples 8-12) were clearly dominated by particles with a size corresponding to sands (68.0-95.5%), which are the primary fraction. Figure 6: The content of soil fractions determined using the hydrometer method. In the case of the method of the Analysette 22 laser diffractometer (Figure 7), a very similar grain size composition was observed in the low-organic soil samples (sample Nos. 1 and 2), where 76.10-80.78% of the grains corresponded in size to silts--the primary fraction--10.09-11.22% to clays and 9.14-12.68% to sands. The medium-organic soils (sample Nos. 3-7) were dominated by silts (66.12-83.43%), which were the primary fraction, sand was practically absent (0.00-0.08%) and the secondary fraction was clay, which ranged from 16.54 to 33.88%. The particle size distribution tests using the Helos laser diffractometer are presented in Figure 8. The low-organic soils (sample No. 1 and No. 2) were characterized by the highest content of aggregates, corresponding in size to silt (50.99-77.65%), which  
Figure 8: The content of soil fractions determined using the Helos laser diffractometer. Figure 7: The content of soil fractions determined using the Analysette 22 laser diffractometer. constituted the primary fraction, followed by sand (15.12-44.24%)--the secondary fraction. The tertiary fraction included grains classified as clays, which had marginal significance (4.77-7.23%). In medium-organic soil (sample Nos. 3-7), the primary fraction consisted of grains belonging to the silt fraction (37.33-80.09%), except for sample No. 3, where sand predominated (58.54%). The least numerous fraction (the tertiary fraction) turned out to be the clay fraction, ranging from 4.13 to 9.36%. In the last classification group, high-organic soils (samples 8-12), the primary fraction was silts particles (45.91-83.39%). For the other fractions (clays and sands), it was difficult to clearly identify whether the fraction was secondary or tertiary, as the content of grains corresponding to clays ranged from 2.29 to 14.32%, and for sands from 2.29 to 50.01%. In addition, detailed results of the organic soil tests using the Helos laser diffractometer are presented in the form of particle size distribution curves. Figures 9-11 shows the particle size cumulative distribution curves of the tested low-organic soils (No.