Aqueous compost extracts with stabilized biofertilizing microbiota promote plant root growth and drought resilience

作者：R. Lerma-Moliz, Jing Hu, J.A. López-González, F. Suárez‐Estrella, M.R. Martínez-Gallardo, M.M. Jurado, María J. Estrella-González, A.J. Toribio, R. Jiménez, Stefaan De Neve, M.J. López · 发表于：The Science of The Total Environment · 年份：2025 · DOI：10.1016/j.scitotenv.2025.179157 · 被引用次数：10 · 研究领域：Plant Growth Enhancement Techniques、Composting and Vermicomposting Techniques、Legume Nitrogen Fixing Symbiosis

The excessive use of agrochemicals has caused significant negative environmental impacts, highlighting the growing need for more sustainable alternatives. Among these, aqueous composts extracts enable less harmful intensive agricultural practices. The objective of this study was to explore methods for stabilizing the biofertilizing microbiota of compost extracts and to evaluate their effects on drought and oxidative stress. For this, an aqueous extract was prepared from agri-food waste compost by suspending it in water at a 1:5 ratio and incubating the mixture for 14 days at room temperature. The physicochemical properties of the extract were analyzed. In addition, microorganisms associated with the biofertilizing capacity of the extract, which was formulated with various compounds were monitored over the course of one month storage at different temperatures. The bioformulations showing better biofertilizing potential were selected for testing on cucumber seedlings to evaluate their capability for promoting plant growth and alleviating oxidative stress. Additionally, a drought stress test was conducted on grass to evaluate the effect of applying the extract. The results of the physicochemical characterization and bacterial abundance showed a good nutritional composition and a rich microbiota with biofertilizing activity. In terms of microorganism counts under storage conditions, the most stable formulations were those formed by the extract supplemented with 2 % glycerol, as w...