## 3 Results
### Phytotoxic Indicators
With an increase in the concentration of nitrate of tellurium 1-30 PPC, a decrease in germination on the 10 th day by 32-80% and on the 30 th by 13-63%, and on the 90 th day, at concentrations of 3-30 PPC, a decrease in germination by 58-73% relative to the pure soil was established. The length of wheat roots after contamination with both chemical forms of silver, bismuth, tellurium, and thallium after 10, 30, and 90 days depended on the duration of contamination and the chemical form of heavy metal (Figure 7). Silver oxide at a concentration of 0.5 PPC only on the 30 th day caused a decrease in root length by 23% relative to the pure soil. On the 10 th and 90 th days at 0.5 PPC of silver oxide, there were no significant differences from the pure soil in the length of wheat roots. With an increase in the concentration of silver oxide 1-30 PPC after 10 days of the experiment, a decrease in germination by 20-50% was found, after 30 days by 32-48%, and after 90 days by 37-68% relative to the pure soil. Nitrate of silver reduced root length only on the 30 th day at concentrations of 0.5 and 1 PPC by 26 and 33%. At the same concentrations after 10 and 90 days, there was no significant difference from the pure soil. Bismuth oxide at 0.5 PPC reduced root length on the 30 and 90 th days by 47 and 32% relative to the pure soil. With an increase in the concentration of bismuth oxide 3-30 PPC on the 10 th day, a decrease in root length by 19-35% was found. After 30 days, with an increase in the content of bismuth oxide 1-30 PPC, the reduction in root length was 48-59%, on the 90 th day-33-37%. Nitrate of bismuth after 10 days had a toxic effect on the root length only at 10 and 30 PPC-9 and 18% relative to the pure soil. After 30 days, nitrate of bismuth at 1-30 PPC reduced the length of wheat roots by 47-64% of the pure soil. On the 90 th day, a decrease in root length was found only at 10 and 30 PPC by 24 and 25% relative to the pure soil. Thallium oxide at 0.5 PPC reduced root length only on the 10 and 30 th days by 14 and 22%. On the 90 th day, there was no significant difference in root length when contaminated with thallium oxide from the pure soil. With an increase in thallium oxide 1-30 PPC on the 10 th day, a decrease in root length by 27-63% relative to the pure soil was found. On the  
Figure 7: Root length of winter wheat (_Triticum aestivum_ L) on soil after contamination of silver, bismuth, tellurium, and thallium, % of the pure soil. 30 th day, with thallium oxide 1-30 PPC, a decrease in the length of wheat roots by 22-94% relative to the pure soil was found. On the 90 th day, the soil recovered from thallium oxide contamination, and a decrease in root length was found for 10 and 30 PPC by 11 and 24% relative to the pure soil. Nitrate of thallium at 0.5 PPC on the 10 th and 30 th days inhibited root length by 22 and 45% relative to the pure soil. On the 90 th day, there was no significant difference in root length when contaminated with nitrate of thallium. With an increase in the concentration 1-30 PPC on the 10 th day, a decrease in root length by 22-96% relative to the pure soil was found. On the 30 th day, the reduction in root length at a concentration of 1-30 PPC was 56-89%, and on the 90 th day it was 7-86% relative to the pure soil. Tellurium oxide at 0.5 PPC reduced root length only on the 10 th and 30 th days by 17 and 41% relative to the pure soil. On the 90 th day, there was no significant difference in root length when contaminated with tellurium oxide from the pure soil. With an increase in tellurium oxide 1-30 PPC on the 10 th day, the reduction in root length was 28-49%, and on the 30 th day it was 64-78% relative to the pure soil. On the 90 th day, a decrease in root length was found only at a concentration of 10 and 30 PPC by 14 and 32% relative to the pure soil. Nitrate of tellurium at 0.5 PPC on the 10 th and 30 th days inhibited root length by 22 and 45% relative to the pure soil. On the 90 th day, there was no significant difference in root length when contaminated with nitrate of tellurium.