Water-soluble organic matter from different composts: Characterization and effects on maize seeds germination

摘要

Water-soluble organic matter extracts (C.WOM) were obtained from an artichoke compost (C.Cyn,), a tomato/woodchips compost (C.C1) and a maize compost (C.Mais) and then tested on maize seeds germination bioassay. C.WOM was further characterized by spectroscopic and thermal analysis such as CPMAS?~(13) C NMR, DRIFT-IR, thermal gravimetric analysis and differential scanning calorimetry. The germination percentage resulted generally decreased, while root and shoot length resulted increased in presence of Mais C.WOM, which showed the highest presence of hydrophilic moieties, whereas C.WOM from C1 and Cyn resulted more aromatic. These results confirm the role of organic matter in stimulating plant growth, in particular when the content of potentially bioavailable hydrophilic components is predominant as in the case of C.WOM.