## 3 Results and Discussion
### Analyzing of the Applicability of Sunflower Husk Ashes Granules as Bio-Fertilizer  
The final product obtained during experimental procedure 8 from the previous section (Table 5) was subjected to detailed chemical and biochemical analyses for the evaluation of its applicability as a bio-fertilizer in an accredited laboratory, as described in Section 2. Table 6 presents the elemental composition of the sample analyzed with ICP and the specific error range where applicable. Figure 4: Delivered and constructed facilities by Green Circle Biotech Ltd. at the Polski Trambesh site: (**a**) screening machine; (**b**) packing machine. \begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Experiment** & **Samples** & **Volumetric** & **K\({}_{2}\)O** & **P\({}_{2}\)O\({}_{5}\)** \\  & **in Mixture** & **Ratio** & **wt. \%** & **wt. \%** \\ \hline Exp. 8 & SHA1-F and SHA7-F & 50/50 & 30.8 & 4.9 \\ Exp. 9 & SHA1-S and SHA2-S & 50/50 & 29.5 & 5.8 \\ Exp. 10 & SHA7-S and SHA2-S & 70/30 & 30.0 & 4.7 \\ Exp. 11 & SHA4-F, SHA4-B, and SHA2-S & 0.26/0.24/0.5 & 31.0 & 6.6 \\ Exp. 12 & SHA4-F, SHA4-B, and SHA2-S & 0.36/0.34/0.3 & 33.6 & 4.8 \\ Exp. 13 & SHA5-F, SHA5-B, and SHA2-S & 0.43/0.37/0.2 & 25.8 & 5.2 \\ \hline \hline \end{tabular}
\end{table} 
Table 5: Experimental conditions and results from the mixing of different sources. The additional analyses regarding organic toxic compounds were performed. The results for the detected polycyclic aromatic hydrocarbon estimated according to BNS EN 17503:2022 are presented in Table 7. Analyses for polychlorinated biphenyls concentrations estimated according to EPA 1668B:2008 are presented in Table 8. The results for long-lived polyhalogenated organic compounds estimated according to EPA 8290A:2007 are listed in Table 9. For all analyses, the specific error range is presented where applicable. Microbiological analyses were performed for _E. coli_ and _Salmonella_ spp., and both were negative. The detailed analyses show that the concentrations of macro and trace elements in the investigated granulated SHA allow the product's utilization in agricultural fields as a bio-fertilizer. Since no other components are added during the technological process, the chemical composition of the SHA and the granules is completely identical, and in subsequent analyses it is not necessary to characterize both. The benefits of applying granular fertilizer rather than directly utilizing ash residue have been studied by other \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Chemical** & **Result** & **Chemical** & **Result** \\
**Element** & **mg/kg** & **Element** & **mg/kg** \\ \hline Boron & 620 \(\pm\) 31 & Sulfur & 29,992 \(\pm\) 1500 \\ Vanadium & 2.2 \(\pm\) 0.22 & Thallium & \textless{}0.050 \\ Iron & 749 \(\pm\) 37 & Phosphorus & 21,564 \(\pm\) 1078 \\ Potassium & 355,573 \(\pm\) 17,779 & Chromium & 43.5 \(\pm\) 2.2 \\ Calcium & 137,394 \(\pm\) 6870 & Zinc & 164 \(\pm\) 8 \\ Magnesium & 71,023 \(\pm\) 3551 & Arsenic & \textless{}0.050 \\ Manganese & 203 \(\pm\) 10 & Cadmium & 1.37 \(\pm\) 0.14 \\ Copper & 263 \(\pm\) 13 & Mercury & \textless{}0.050 \\ Nickel & 23.5 \(\pm\) 1.2 & Lead & 1.20 \(\pm\) 0.12 \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Elemental composition of the granulated sunflower husk ash.