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Ecotoxicological Hazard of Pesticide Use in Traditional Agricultural Technologies

Lishchuk Alla, Parfenyk Alla, Furdychko Orest, Boroday Vira, Beznosko Iryna, Drebot Oksana, Karachinska Nadiya

Journal of Ecological Engineering

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2024

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Vol. 25, nr 2

274--289

EN

The ecotoxicological hazard assessment of pesticide use on crops was performed. The study was conducted in 2021-2023 at the experimental field of the Skvyra Research Farm of the Institute of Agroecology and Environmental Management of National Academy of Agrarian Sciences of Ukraine, located in the Forest-Steppe zone of Ukraine. The influence of herbicides, insecticides, and fungicides on the formation of environmental hazards in crop agrocenoses was studied: experiment (1) – peas, winter wheat, buckwheat; experiment (2) – winter wheat, buckwheat, oats. The ecological risk was assessed taking into account the ecotoxic properties of the chemical active ingredients of pesticides. It was found that the main parameters characterizing the occurrence of environmental risks are: (i) the pesticide load, i.e. the amount of toxicant applied per unit of sown area; (ii) the ecotoxicity of the pesticide (LD50), which is established by hygienic standards; (iii) the persistence of the pesticide in the soil, namely, its half-life (DT50), etc. The calculations proved that the pesticides used had a low environmental risk of impact on agrocenoses. This is evidenced by the ecotoxicity index (E). The total pesticide load (ΣE) on the agrocenosis of each crop during the three years of the study (2021–2023) was calculated. It was found that in experiment (1) – ΣExperiment 1 = 0.23 conventional units (c.u.); in experiment (2) – ΣEexperiment 2 = 0.04 c.u. The results obtained indicate an insignificant environmental risk of pesticide use for experimental plots of crops of the studied farm. However, prolonged use of pesticides certainly leads to the concentration of their persistent residues in the soil. This can lead to contamination of crop products and environmental. The cereals (buckwheat and oats) grown on the farm are intended for dietary consumption. To confirm the reliability of the hypothesis of the safety of the obtained grain and cereal products, it is advisable to further study their quality in terms of pesticide residues. It is shown that this methodology can be used to assess the risk of pesticide contamination of an agroecosystem. The ecotoxicity criterion (E) can be considered as a management tool for reducing environmental risks in agroecosystems.

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Environmental Risks of the Pesticide Use in Agrocenoses and Their Management

Lishchuk Alla, Parfenyk Alla, Horodyska Іnna, Boroday Vira, Ternovyi Yurii, Tymoshenko Liudmyla

Journal of Ecological Engineering

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2023

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Vol. 24, nr 3

199--212

EN

The article is devoted to the development of methodical approaches to the management of environmental risks due to pesticide contamination of agrocenoses. An assessment of ecological risks due to the use of pesticides was carried out at the scientific research field of the Skvirskaya research station of organic production of the IAP of the National Academy of Sciences during the growing seasons of 2019–2021. The methods of assessing the ecological risks of potential pesticide contamination of agrocenoses based on the indicators of the agroecotoxicological index (AETI) and the ecotoxic impact of harmful substances (E) were used on the natural environment. It was shown that the level of environmental risk due to the use of pesticides in the research field of the station according to the weighted average indices (AETI) is characterized as low – risk, and the environmental risk due to the pesticides using is minimal. According to indicators of ecotoxicity (E), the pesticides that were used are characterized as having a low potential ecotoxic risk of impact on agrocenoses of cultivated plants. However, the total pesticide ecotoxicological load (ΣЕ = 0.425 compared to the standard EDDT = 1) indicates the possibility of disruption of ecological connectivities in the agroecosystem. One of the elements of environmental risk management can be the assessment of the pesticide load on agroecosystems and considering of the territory ability to self-clean. In order to minimize the environmental risks of pesticide contamination of agrocenoses, measures should be taken to regulate the use of chemical plant protection agents. This can be done by banning or limiting the use of pesticides that have a high level of ecotoxicity and are persistent in the soil. This will contribute to increasing the ecological safety of agro-ecosystems and the natural environment.

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Bioindication for Detecting Environmental Risks in Agrocenoses Contaminated with Heavy Metals

Lishchuk Alla, Parfenyk Alla, Horodyska Іnna, Boroday Vira, Khitrenko Tetiana, Tymoshenko Liudmyla

Journal of Ecological Engineering

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2023

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Vol. 24, nr 8

175--182

EN

The relevance and scientific and methodological approaches to the use of the bioindication method for assessing environmental risks in agrocenoses contaminated with toxic substances (in particular, heavy metals) were substantiated in the article. The study is based on the use of bee honey and heavy metal transfer coefficients in the sequential chain "soil – honey plant – bee honey". This ensures control over the content of toxicants in the soil and inflorescences of honey plants. Toxicant transfer coefficients can be used in the soil-plant-beekeeping products chain as indicators for developing environmental risk management tools. Bioindication is important for contaminated agricultural landscapes that are used as raw materials and forage lands for beekeeping and other environmental objects. The use of the bioindication method makes it possible to assess the environmental risks of toxic substance pollution of agroecosystems and natural biocenoses and to outline the boundaries of toxicant pollution of a certain area for the safe placement of apiaries and obtaining high-quality bee honey.