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Evaluation of the Efficiency of Energy Populus (Poplar) Growing Technology as an Alternative Source of Energy

lys Nadiia, Tkachuk Nadiіa, Butenko Andrii, Kozak Maksym, Polyvanyi Anton, Kovalenko Vitalii, Pylypenko Viktoriia, Andrukh Serhii, Livoshchenko Yevheniia, Livoshchenko Ludmila

Journal of Ecological Engineering

2023

Vol. 24, nr 12

152--157

After conducting research on energy Populus plants, it was discovered that biometric indicators and productivity were affected by both sowing density and nutritional background. The results showed that the tallest energy Populus shoots were observed in the group with a sowing density of 5600 pieces/ha, reaching heights of 11.1–11.6 m. The diameter of the central shoot in this variant was between 157 and 163 mm. The number of shoots was 1.8–2.5 pcs. on 1 plant and 21600–30000 pcs. on 1 hectare. The variant with a sowing density of 6700 units/ha yielded the most energy Populus biomass, specifically 178.3 tons of green mass and 100.9 tons of dry mass per hectare. Compared to the variant with a sowing density of 8300 units/ha, this represented an increase of 19.9 and 11.3 t/ha respectively, and an increase of 18.0 and 10.4 t/ha respectively, when compared to the variant with a sowing density of 5600 units/ha. The utilization of mineral fertilizers was shown to notably enhance productivity, as evidenced by an increase in green mass of 21.1–37.1 t/ha and an increase in dry mass of 11.2–20.6 t/ha across all trial variations. In the Precarpathian region, where sod podzolized soils are prevalent, the optimal sowing density of energy Populus biofuel was determined to be 6700 pcs./ha, with a yield of 110.990 kg/ha achieved through the application of mineral fertilizers. This approach generated an energy output of 1775.8 GJ/ha. In the case of a sowing density of 8300 units/ha and the use of mineral fertilizers, the energy output produced was 1576.9 GJ/ha, whereas sowing density of 5600 units/ha resulted in an energy output of 1591.0 GJ/ha. The introduction of mineral fertilizers led to an increase in energy output ranging from 12.3 to 22.6 GJ/ha for all experimental variants.

Dynamics of Productivity of Leguminous Plant Groups during Long-Term Use on Different Nutritional Backgrounds

Karbivska Uliana, Butenko Andrii, Kozak Maksym, Filon Vasyl, Bahorka Mariia, Yurchenko Nataliiа, Pshychenko Olena, Kyrylchuk Kateryna, Kharchenko Serhii, Kovalenko Ievgenii

Journal of Ecological Engineering

2023

Vol. 24, nr 6

190--196

Deterioration of ecological situation, increase of mineral fertilizer prices and their foreseen increase in recent years force us to look for the ways to reduce the rates of their application and alternative means of maintaining high productivity of sown fodder lands. Fertilization was and remains one of the decisive ways of increasing haymaking productivity, as well as increasing their economic efficiency. The productivity of leguminous grasses based on the study of agrotechnological measures of cultivation in the conditions of the Carpathian region is currently relevant. The studied species of perennial grasses, during the three-year cultivation, showed that the largest number of shoots was formed on the variant with horned sedge and was 1185–1201 pieces/m2. Medicago sativa had the smallest number of shoots (470 pics/m2, control (without fertilizers)). Trifolium pratense and Lotus corniculatus provided the highest productivity in relation to other species from 20 to 31%. Analysis of single–species crops productivity of perennial bean grasses by cuttings showed that the peculiarities obtained on average for all slopes, were also similar in each of two slopes. During the three–year use of the herbage on the yield from 1 ha of dry mass in both slopes, the herbage factor had the greatest influence, the share of which was 61–62%, while the share of the influence of fertilizer was 38–39%.

Nutrient Balance of Sod-Podzolic Soil Depending on the Productivity of Meadow Agrophytocenosis and Fertilization

Karbivska Uliana, Masyk Ihor, Butenko Andrii, Onychko Viktor, Onychko Tetiana, Kriuchko Lyudmyla, Rozhko Valentina, Karpenko Olena, Kozak Maksym

Ecological Engineering & Environmental Technology

2022

Vol. 23, iss. 2

70--77

The influence of mineral fertilizers on productivity and nutrient balance of sod–podzolic soil when growing cereal meadow agrophytocenosis under conditions of Precarpathians of Ukraine was researched. It was found that the dependence of cereal agrocenosis productivity on the doses and ratios of N, P, K in mineral fertilizers is described by equation (polynomial) of the 2nd degree. Among the mineral elements, nitrogen is has the greatest influence on grass productivity. When applying the total dose of N75 with even distribution of nitrogen under each of three mowings on different backgrounds of phosphorus-potassium fertilizers, the productivity of cereal grass increases by 2.82–3.06 t ha-1 of dry mass, and when applying N150 by 3.33–4.93 t ha-1 of dry mass. Recoupment of nitrogen fertilizers per 1 kg by yield increase when applying N75 is 38–41 kg of dry mass, which is 4–5 kg more compared to the application of N150. The indices of phosphorus and especially potassium removal, as well as deficiency of these elements in the balance increased along with nitrogen dose. Independently of the phosphorus and potassium doses, the lowest indices are fixed on a nitrogen–free background, and the highest – on the background of N150.