## 3 Results
### Macro and Micromutrient Content  
Based on the results, the macronutrient and micronutrient content of the backyard and the ecological composots typically did not differ from each other, and were in the same range. It can be stated that all the examined backyard and ecological composots met the requirements valid in Hungary for the calcium content; however, only some of the backyard composots met the requirements for the magnesium content (composts B, C, D, H, and M). Therefore, the examined composots mixed into the topsoil in a suitable quantity would provide an appropriate amount of calcium and sufficient amount of magnesium for the produced crops. Based on the macro and micronutrient content of the examined composots, it can be stated that their calcium (1.32-5 and 1.8-3.9% d.m.) and magnesium content (0.3-0.7 and 0.3-0.4% d.m.) reached and exceeded the typical range for cow manures (calcium: 2.03-2.16; magnesium: 0.42-0.46% d.m.) that is often applied in hobby gardens and household farming, which is a common application area for backyard composots. Their iron (0.6-1.1 and 0.7% d.m.) and manganese (239-667 and 296-340 mg \(\times\) kg\({}^{-1}\) d.m.) content, however, exceeded the typical range for cow manures (iron: 0.22-0.51% d.m.; manganese: 117-161 mg \(\times\) kg\({}^{-1}\) d.m.) [64]. Based on these findings, it can be concluded that, according to the determined macronutrient (Ca, Mg) and micronutrient (Fe, Mn) content of the examined composots, they have similar and, in some cases, more favorable nutrient-supplying capacity in crop production than the frequently-used cow manures.  
\begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline \multirow{2}{*}{**Sample**} & **Cd** & **Cr** & **Cu** & **Hg** & **Ni** & **Pb** & **Zn** \\ \cline{2-8}  & & & & **mg \(\times\) kg\({}^{-1}\) d.m. & & & \\ \hline A a ** & 0.23 \(\pm\) 0.03 & 10.68 \(\pm\) 0.00 & 12.25 \(\pm\) 0.11 & md & 5.12 \(\pm\) 0.06 & 3.49 \(\pm\) 0.12 & 49.8 \(\pm\) 0.3 \\ B a  & 0.64 \(\pm\) 0.03 & 17.42 \(\pm\) 0.03 & 29.05 \(\pm\) 0.28 & md & 7.95 \(\pm\) 0.29 & 15.21 \(\pm\) 0.70 & 94.8 \(\pm\) 0.1 \\ C a  & 0.69 \(\pm\) 0.05 & 16.51 \(\pm\) 0.12 & 32.00 \(\pm\) 0.12 & md & 9.35 \(\pm\) 0.24 & 11.80 \(\pm\) 0.22 & 118.7 \(\pm\) 0.1 \\ D a  & 0.35 \(\pm\) 0.01 & 12.28 \(\pm\) 0.07 & 19.16 \(\pm\) 0.60 & md & 5.87 \(\pm\) 0.27 & 5.30 \(\pm\) 0.57 & 66.5 \(\pm\) 0.3 \\ E a  & 0.85 \(\pm\) 0.01 & 22.87 \(\pm\) 0.29 & 23.35 \(\pm\) 0.27 & md & 10.06 \(\pm\) 0.18 & 18.68 \(\pm\) 0.49 & 134.8 \(\pm\) 0.9 \\ F a  & 0.93 \(\pm\) 0.05 & 30.02 \(\pm\) 0.31 & 21.07 \(\pm\) 0.39 & md & 10.84 \(\pm\) 0.1 & 14.17 \(\pm\) 0.62 & 109.2 \(\pm\) 0.2 \\ G a  & 0.87 \(\pm\) 0.01 & 20.59 \(\pm\) 0.19 & 11.81 \(\pm\) 0.29 & md & 8.66 \(\pm\) 0.21 & 15.55 \(\pm\) 0.33 & 52.7 \(\pm\) 0.0 \\ H a  & 0.77 \(\pm\) 0.03 & 11.14 \(\pm\) 0.02 & 9.82 \(\pm\) 0.08 & md & 6.35 \(\pm\) 0.63 & 6.56 \(\pm\) 0.40 & 85.7 \(\pm\) 0.7 \\ I a  & 0.66 \(\pm\) 0.04 & 17.87 \(\pm\) 0.02 & 44.03 \(\pm\) 0.52 & md & 11.76 \(\pm\) 0.15 & 9.21 \(\pm\) 0.41 & 53.8 \(\pm\) 0.3 \\ J a  & 0.65 \(\pm\) 0.01 & 15.11 \(\pm\) 0.15 & 25.08 \(\pm\) 0.47 & md & 9.74 \(\pm\) 0.01 & 8.53 \(\pm\) 0.97 & 55.6 \(\pm\) 0.3 \\ K a  & 0.91 \(\pm\) 0.06 & 29.19 \(\pm\) 0.46 & 98.16 \(\pm\) 2.87 & md & 7.91 \(\pm\) 0.20 & 13.70 \(\pm\) 1.06 & 78.9 \(\pm\) 0.4 \\ L a  & 0.56 \(\pm\) 0.03 & 10.45 \(\pm\) 0.01 & 22.12 \(\pm\) 0.16 & md & 5.64 \(\pm\) 0.44 & 12.12 \(\pm\) 0.08 & 135.6 \(\pm\) 0.1 \\ M a  & 0.70 \(\pm\) 0.11 & 17.04 \(\pm\) 0.11 & 21.74 \(\pm\) 0.49 & md & 10.21 \(\pm\) 0.14 & 10.14 \(\pm\) 0.12 & 71.2 \(\pm\) 0.3 \\ N b  & 0.87 \(\pm\) 0.01 & 11.1 \(\pm\) 0.06 & 10.07 \(\pm\) 0.39 & md & 5.13 \(\pm\) 0.15 & 5.6 \(\pm\) 0.02 & 38.8 \(\pm\) 0.5 \\ O b  & 0.8 \(\pm\) 0.24 & 12.85 \(\pm\) 0.44 & md & 5.28 \(\pm\) 0.14 & 6.02 \(\pm\) 0.2 & 46.6 \(\pm\) 0.7 \\ P b  & 0.8 \(\pm\) 0.25 & 10.13 \(\pm\) 0.53 & md & 5.69 \(\pm\) 0.13 & 5.39 \(\pm\) 0.63 & 32.9 \(\pm\) 0.7 \\ \hline \hline \end{tabular}
\end{table}
Table 2: The determined potentially toxic element content of the examined composots.