## 3 Results and Discussion
### Soil Texture  
The transformation of organic materials depended on the texture of the soil. When analysing data, we evaluated the interdependence of individual outcomes at different soil sample locations in certain profiles and soil types regarding the relationship among soil texture (Figure 3). Figure 3: Characteristics of soil texture—average values (sand: 2–0.050 mm, silt: 0.05–0.002 mm, clay: \(<\)0.002 mm). The procedures for transformation are impacted by sand, silt, and clay due to pH and other factors. In selected profiles depending on depth, there were the following textures: P1 loam (0-0.35 m), clay (>0.35 m), P2 loam (0-0.07 m), sand clay (0.07-0.36 m, >0.35 m), P3 silt (0-0.06 m), silt loam (0.06-0.09 m), sand clay (>0.09 m), P4 sandy clay loam (0-0.6 m), sandy clay (0.06-0.20 m), clay (0.20-0.50 m), P5 clay loam (0-0.15 m), and clay (0.15-0.60 m, >0.60 m). In certain soil types and profiles, we assessed the dependence of individual values in Figure 3 at soil sample locations. According to [PERSON] et al. (2016), the subsoil's increased particles, clay (loam), fine texture, and organic materials may contribute to decreased heavy metal concentrations in plant shoots (subsoil at root depth). Clay (loam) can form strong connections with toxic elements in the soil from biomass addition based on various types of land uses, rates of decomposition, and plant materials, which reduces the metals' availability to plants (Rom  
There was a noteworthy correlation found among the concentration of humic substances and the bioaccessible forms of Cd (r = 0.734, \(p<0.01\)) and Pb (r = 0.709, \(p<0.01\)). Table 4 displays the association among the bioaccessible forms of Cd and Pb as well as the levels of fulvic and humic acids. The results show that Pb is relatively stable and has weak migration potential [64]. The relationship between Cd and Pb in soil is complex and multifaceted. Both lead and cadmium are heavy metals that can coexist in soil environments, and their interactions can have significant implications for environmental quality and human health [71]. In some cases, lead contamination in soil can influence the behaviour and mobility of cadmium and vice versa. For example, these metals' adsorption and desorption processes can be interrelated, affecting their bioaccessibility and potential for leaching into groundwater. Additionally, one metal's existence may affect another's absorption and buildup by plants and other organisms in the soil environment. Furthermore, the capacities to dissolve and transport cadmium and lead are influenced by soil properties and the minerals [59]. Changes in these soil properties can affect the interactions between cadmium and lead, potentially altering their distribution and bioaccessibility in the soil. Understanding the relationship between cadmium and lead in soil is crucial for assessing the possible dangers to the environment connected with heavy metal contamination. By investigating the interplay between these metals, we can gain insights into their behaviour, possible interactions, and the overall impact on soil quality, environmental health, and the mitigation of the environmental effects of soil that has been exposed to toxic elements. QHSs and QHAs were shown to correlate with the bioaccessible forms of heavy metals (Table 4). The positive connection was discovered by applying the Spearman correlation technique, which statistically assessed the connection of correlation with a high degree between the bioaccessible and total contents of Cd/Pb and the soil silt fraction (Table 4). A negative correlation with high degree was found between the contents of heavy metals and clay fraction on the significance level \(\alpha=0.01\) (Table 4). According to [PERSON] et al. [57], the content of heavy metals usually decreases from clay to coarse silt. The soils with high amounts of clay fraction and organic matter can contribute more to heavy metals than others [57].