BOOK OF ABSTRACTS 215 IHSS&IWA26 / BRNO / CZECHIA / 23–28 August 2026 Hall A Poster Session / Environment, Agriculture, and Forestry P4.1 Characteristics of the EOM Product Formed during Aerobic Bioconversion of Lignocellulosic and Biodegradable Municipal Waste Jakub Bekier1, Elżbieta Jamroz1, Katarzyna Adamczewska-Sowińska2, Józef Sowiński3 1 Institute of Soil Sciences, Plant Nutrition and Environmental Protection, Wroclaw University of Environmental and Life Sciences, ul Grunwaldzka 53, 50-357 Wrocław, Poland, jakub. bekier@upwr.edu.pl, elzbieta.jamroz@upwr.edu.pl 2 Department of Horticulture, Wroclaw University of Environmental and Life Sciences, 50-375 Wrocław, Poland 3 Institute of Agroecology and Crop Production, Wroclaw University of Environmental and Life Sciences, 50-375 Wroclaw, Poland In recent decades, there has been a significant decrease in humus resources in the terrestrial environment, including in agriculturally used soils, due to increased mineralisation of soil organic matter (SOM). Current trends and guidelines related to the proper use of soils indicate that efforts should be made to increase the soil organic matter content [1-3]. The most reasonable solutions seem to be those suggesting: the sustainable management of humus compound resources, especially in intensively used and/or modified areas; optimisation of the humus content by using components of sufficient quality and/or products made from exogenous organic matter (EOM); and developing optimal and reasonable methods for the use of SOM resources based on comprehensive, integrated long-term management. Using composting as a method to recycle lignin-cellulosic biomass by obtaining the most useful product possible, the application of microbial stimulation seems to be justified [3-5]. It should be noted that the lack of knowledge of metabolic processes should not be a barrier to this type of research, but on the contrary, it should be an invitation to use biological solutions in biomass composting. The aim of this study was the qualitative and quantitative analysis of humic acids during the composting of exogenous organic matter (EOM): composts from a mixture of energy willow biomass and hay (HWBC), composts from a mixture of willow and hay inoculated with microorganisms (HWIBC), and composts from biodegradable municipal solid waste (MSWC). The total duration of the experiment was 14 weeks. During the experiment, the temperature (daily) and moisture content (every 5 days) of the composted mass were monitored. The materials were watered to an optimum level of 40–60% of H2O and formed into piles with dimensions L × W × H = 5.0 m ×
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