## 3 Results and Discussion
On the other hand, granulate III (20% industrial sludge) had no significant effect on the test plant's uptake of the tested heavy metals. Granulate IV (50% industrial sludge) between the 1 st and 2 nd doses had the most significant impact on nickel uptake by 33.7% and zinc uptake by 21.6%. The research results indicate that the uptake of heavy metals by rape seeds was arranged in the following series of decreasing values: Pb > Ni > Cd > Cr > Zn > Cu, and by triticale grain Pb > Ni > Zn > Cd > Cr > Cu. [PERSON] [35] found that the amount of heavy metals taken up by crop plants, i.e., barley grain can be represented as a series: Zn > Cu > Cd > Ni. This confirms the thesis that the content and uptake of nutrients and heavy metals in crops depend primarily on the species and even the cultivar of the plant [36]. Fertilizer granulates I (30% industrial sludge), II (40% industrial sludge), III (20% industrial sludge) and IV (50% industrial sludge) made from waste and applied significantly increased the content of heavy metals in rape and triticale grain compared to the control object. The level of heavy metal content in the test plants was lower than the toxic  
\begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline \multicolumn{2}{c}{**Type of**} & \multicolumn{5}{c}{**Cd**} & \multicolumn{5}{c}{**Cu**} \\ \cline{2-9}
**Granulates (G\({}^{*}\))** & \multicolumn{5}{c}{**Dose (D)**} & \\ \cline{2-9}  & **1** & **2** & **3** & **Mean** & **1** & **2** & **3** & **Mean** \\ \hline I & 0.41 & 0.55 & 0.61 & 0.52 & 0.06 & 0.07 & 0.08 & 0.07 \\ II & 0.46 & 0.72 & 0.73 & 0.63 & 0.06 & 0.09 & 0.09 & 0.08 \\ III & 0.26 & 0.27 & 0.44 & 0.32 & 0.03 & 0.03 & 0.05 & 0.04 \\ IV & 0.60 & 0.69 & 0.74 & 0.67 & 0.07 & 0.08 & 0.08 & 0.08 \\ Mean & 0.43 & 0.56 & 0.63 & 0.54 & 0.05 & 0.07 & 0.08 & 0.07 \\ Control & & 0.19 & & & & 0.03 & & \\ LSD\({}_{0.05}\) G—0.053; D—0.041; G \(\times\) D—0.091 & & & & LSD\({}_{0.05}\) G—0.002; D—0.001; G \(\times\) D—n.s. \\ \hline \multicolumn{9}{c}{**Cr**} & \multicolumn{5}{c}{**Ni**} \\ I & 0.18 & 0.26 & 0.29 & 0.24 & 3.43 & 4.63 & 5.45 & 4.50 \\ II & 0.21 & 0.32 & 0.33 & 0.29 & 5.30 & 8.31 & 9.36 & 7.66 \\ III & 0.11 & 0.11 & 0.17 & 0.13 & 2.26 & 2.28 & 3.85 & 2.79 \\ IV & 0.24 & 0.28 & 0.31 & 0.28 & 5.87 & 7.85 & 8.81 & 7.51 \\ Mean & 0.19 & 0.24 & 0.28 & 0.24 concentration of these elements for cultivated plants [31]. The results of research on the effect of granulates from industrial sludge on the quality of rape seeds and triticale grains indicate that their effects depend on the amount and chemical properties of individual components. The research showed that the greater the share of industrial sludge and the smaller the share of lignite ash in the granulates, the more heavy metals the test plants contained (granulates II and IV). These results are confirmed by research conducted by [25,37]. Among many wastes used in agriculture on the European Union (EU) the sludges introduced more stringent requirements in comparison with the directive, currently regulated only by the limits of heavy metals (Cd, Cu, Hg, Ni, Pb and Zn) listed in Council Directive 86/278/EEC [38]. The test results showed a relationship (significant at \(p<0.05\)) between the test plant content and uptake of heavy metals. Under the influence of fertilizer granulates, the content of heavy metals in rape seeds and triticale grain was significantly positively correlated (\(r\)) with their uptake (Table 9). The correlation analysis showed a very high degree of correlation between the content of heavy metals in spring rape obtained under the impact of fertilizer granulates and the uptake of nickel, a high degree of correlation between the content and uptake of lead and chromium, and an average between the content and uptake of copper, zinc, and cadmium by rape seeds. The value of the correlation coefficients ranged from \(r=0.507\) to \(r=0.906\). The highest correlation coefficient value was found in rape seeds between the content and uptake of nickel (\(r=0.906\))--Figures 1 and 2.