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Poster

Session: Session 2 Presenting Authors at Posters (Odds)

P-349 - Impact of multicomponent biostimulants on soil microbial diversity and straw decomposition

Wednesday, July 16, 2025
13:30 - 15:15  
Location: Confex Hall 3
Plant microbiota functions and intermicrobial interactions
Biostimulants play a pivotal role in modern agriculture, offering substantial benefits to crop productivity and sustainability. They help improve soil structures as well as plant health and stress resilience of the agricultural system. Despite their long history of use, the mechanisms underlying their efficacy are the subject of active research. In our study, we aim to unravel some of the complex processes through which biostimulants influence plants and their surrounding microbiomes. We studied two non-microbial, multicomponent biostimulants which differ significantly in their chemical composition. We hypothesised that biostimulants trigger plant-microbe interactions and microbial activity in soil, in addition to plant photosynthetic activity. To elucidate possible interactions, we use plant physiological observations and amplicon sequencing of bacterial and fungal communities. Additionally, we examine the microbial response using Community-Level Physiological Profiling (CLPP). With the latter technology, we were also able to monitor microbial metabolic changes during straw decomposition and mineralisation under the influence of multicomponent biostimulants applied onto straw. With these combined approaches, we observed that biostimulant treatment promoted microbial activity and diversity in the rhizosphere as well as during straw decomposition. Our results showed that the chemically different biostimulants drive the microbial diversity into different directions.