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Α Dynamics of Macro Elements Content in Eutric Podzoluvisols for Separation of Wastewater under Jerusalem Artichokes

Lopushniak Vasyl, Hrytsuliak Halyna, Gamayunova Valentina, Kozan Natalia, Zakharchenko Elina, Voloshin Yurii, Lopushniak Halyna, Polutrenko Miroslava, Kotsyubynska Yulia

Journal of Ecological Engineering

2022

Vol. 23, nr 4

33--42

The application of fertilizers based on sewage sludge significantly affects the formation of the nitrogen fund of sod-podzolic soil, as well as changes in the content of mobile compounds of phosphorus and potassium exchange. The application of such fertilizer under Jerusalem artichoke has a positive effect on the nitrogen content of alkaline hydrolyzed compounds, in particular on increasing the content of mineral and alkaline hydrolyzed nitrogen fractions. The application of sewage sludge at a dose of 20–40 t/ha and the appropriate compensatory dose of mineral fertilizers at the rate of N90P90K90 helps to increase the content of ammonium nitrogen compounds from 16 to 20–22 mg/kg of soil in the upper (0–20 cm) layer – 28% prevails over the control variant, as well as the content of nitrate nitrogen compounds in the layer 0–40 cm from 1.70 to 2.52–2.64 mg/kg of soil. The ratio of the content of alkaline hydrolyzed nitrogen compounds to the nitrogen content of mineral compounds in the experimental conditions changes insignificantly, which indirectly indicates a relatively stable value of this indicator, which changes little under the influence of fertilizers. The application of sewage sludge as a fertilizer significantly affects the change in the content of mobile phosphorus compounds and potassium exchange compounds in the upper (0–40 cm) layer of the soil. However, from a depth of 60 cm, their content decreases sharply and approaches the initial values of the control version. Depending on the application of fertilizers, the indicators of the coefficient of concentration of macronutrients in the soil change significantly, which reflects the ratio of the content of the element in the soil to its content in the control variant. As the rate of sewage sludge increases, the element concentration coefficient increases from 1.27 in the variant with the application of only mineral fertilizers to 2.36 for potassium and for phosphorus – from 1.02 to 1.31. There is a close correlation between the content of phosphorus and potassium in the soil and the coefficients of their concentration. This relationship reflects the multiple coefficient of determination, which for phosphorus and potassium is R2 = 0.69 and R2 = 0.90, respectively. The use of fertilizers in the form of compost with sewage sludge and straw of cereals causes similar trends as the introduction of uncomposted sewage sludge. However, this effect has less radical impact with lower absolute nutrient content compared to the introduction of fresh sewage sludge. The application of sewage sludge in the form of compost and uncomposted form contributes to a significant increase in the content of macronutrients in the soil, providing an improvement in the mineral nutrition of cultivated plants, including Jerusalem artichokes.

Post-Harvest Siderates and Soil Hardness

Mishchenko Yurii, Kovalenko Ihor, Butenko Andrii, Danko Yuriy, Trotsenko Volodymyr, Masyk Ihor, Zakharchenko Elina, Hotvianska Anna, Kyrsanova Galyna, Datsko Oksana

Ecological Engineering & Environmental Technology

2022

Vol. 23, iss. 3

54--63

The results of researches of the perspective direction of solving the problem of growth of hardness of typical chernozem, which consisted in enrichment of the soil with fresh organic matter of postharvest greens, are presented. During the years of our research it was found that growing of post-harvest siderates contributed to a significant reduction in hardness of 0-30 cm soil layer. Among the studied siderates the lowest hardness of 0-30 cm soil layer was under crops of Raphanus sativum in all years of research - 10.9-16.8 kg/cm2. In the variants of potato growing without fertilizers was found close reverse relation between hardness and productive moisture reserves - r = -0.74. These dependences confirm positive effect of siderate Raphanus sativum as a factor of biological loosening of soil. After all, it was just the variant where reduction of productive moisture reserves had the smallest share of impact - 22% on the growth of soil hardness. At the same time, this share of influence increased to 27-41% on the background of other siderates and manure, and up to 54% in the control without application of organic fertilizers. The highest yield of potato tubers was obtained on the plots with the lowest soil hardness, where Raphanus sativum was used as a post-harvest siderate, followed by the variants with manure, Phacelia tanacetifolia and Fagopyrum esculentum.

Spatial Heterogeneity of Soil Silicon in Ukrainian Phaozems and Chernozems

Tonkha Oksana, Butenko Andrii, Bykova Olga, Kravchenko Yuriy, Pikovska Olena, Kovalenko Vitalii, Evpak Iryna, Masyk Ihor, Zakharchenko Elina

Journal of Ecological Engineering

2021

Vol. 22, nr 2

111--119

This study investigated the spatial variability of the soil silicon content in relation with topography, parent materials, soil texture, soil organic matter, exchangeable cations and pH. Using the experimental data from two longterm sites in the Forest-Steppe area of Ukraine, the SiO2 content was estimated in 60 samples taken from a soil depth 0–25 cm. The accumulation of SiO2 was significantly greater in the soils formed in footslopes. A content of extractable silicon fraction significantly increased from a sandy loam(366–465 mg•kg-1) to medium(670–697 mg•kg-1) and heavy(506–849 mg•kg-1) textured soils. The highest amount of available silicon content was found in the soils containing: 35.0–39.9% of physical clay fraction (< 0.01 mm dia) in Hrytsiv area – 143.0 ± 46 mg•kg-1 and < 25.0% of physical clay fraction in Khrolyn area – 125.0 ±6 mg•kg-1. A significant relationship was found between pHKCl, P2O5, K2O, Mg and both forms of SiO2. There was almost no correlation between available/ extractable SiO2 and exchangeable Ca and ∑ Ca+Mg. Our studies found the best correlation between extractable SiO2 and spring barley yield (r = 0.651; P = 0.041), as well assoluble SiO2 and corn for grain yield (r = 0.514; P = 0.128). No significant relationships were found for sugar beet, winter wheat, sunflower.