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Figure 2. The content of macronutrients in energy crops on oil-contaminated soil

The content of potassium and phosphorus in the sylph perforated and candlegrass varies for potassium from 0.82-1.23%, respectively, in the control and from 0.6 to 1.43%, respectively, in oil-contaminated soil. For phosphorus, the indicators are 0.22

- 0.34% on the control and 0.21 - 0.29% on the oil-contaminated soil, respectively. The total percentage of macronutrients is reduced by 10.5 - 20% in the green mass of energy crops grown on oil-contaminated soil.

However, the percentage of macronutrients in the vegetative mass of Jerusalem artichoke when grown under control is higher by 4% compared to oil-contaminated soil. Such trends in the change in the chemical composition of plants grown on oil-18

SCIENCE, TRENDS AND PERSPECTIVES OF DEVELOPMENT

contaminated soils indicate a decrease in the intensity of nutrient uptake during the growing season and a decrease in the overall bioproductivity of agrophytocenoses, which is observed in the yield of energy crops. yields of vegetative mass change (Fig.

3).

Figure 3. Yield of green mass of energy crops, t/ha The lowest productivity of green mass is in energy crops of candlegrass and miscanthus and is 19.7 and 26.9 t/ha, respectively, in the control and 15, 3 and 22.1

t/ha on oil-contaminated soil.

The yield of vegetative mass of energy willow, which was grown under control, was 42.9 t/ha, and on oil-contaminated soil, this figure increased by 1.2 t/ha. The yield of green mass of sylphia perforated was 52.1 t/ha in the control, which was 2.9% higher than in the area contaminated with petroleum products. The yield of green mass of Jerusalem artichoke was 50.1 t/ha under control and decreased on oil-contaminated soil to 45.4 t/ha.

According to the results of research, it can be argued that the cultivation of energy crops on oil-contaminated soils significantly reduces the intensity of assimilation of macro-and micronutrients by plants compared to cultivation in unpolluted areas. This affects the formation of the yield of vegetative mass, which decreases depending on the crop by 4.4 - 4.7 t/ha compared to growing on uncontaminated soil.

This trend is observed for all energy crops, except for energy willow, the cultivation of which on contaminated soil helps to increase the yield of green mass compared to the control version by 4.8 t / ha, or 8%. Some resilience to unfavorable growing conditions is also noted by the sylphia pronizanolista, the yield of which on oil-contaminated soil decreased by 1.5 t / ha, or 2.8% compared to the control variant, which was within the 5% statistical error. Also, the yield of vegetative mass of Jerusalem artichoke decreased by 9.3% compared to the control. The lowest resistance to growing conditions on oil-contaminated soil is grassy cereal energy crops, the yield of which in these areas is reduced by 18 - 22% compared to growing on unpolluted soil.

Thus, the cultivation of energy willow and sylphia perforated has significant prospects for the remediation of oil-contaminated areas. The cultivation of herbaceous 19

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cereals (miscanthus and switchgrass) for such purposes requires further study with repeated cycles of use.

Prospects for further research are to study the factors that slow down the assimilation of nutrients by energy crops grown on oil-contaminated soils.

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