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To better understand the role of organic matter(OM)prepared from chicken manure and agriculture residues compost on the growth of plants(Lepidium sativum L.)and antagonistic fungi(Trichoderma harzianum),we analyzed the structure and composition of extracted OM using fluorescence excitation-emission matrix(EEM)spectroscopy and solid-state13C cross-polarization magic-anglespinning nuclear magnetic resonance(13C CPMAS NMR)spectroscopy.The results showed that the EEM contours of water-extracted OM(WEOM)and alkali-extracted OM(AEOM)were similar.Furthermore,solid-state13C CPMAS NMR spectroscopy demonstrated that water extraction could not proportionally pull out aromatic moieties(112–145 ppm)from compost,but the alkali method in proportion extracted both carbohydrates(65–85 ppm)and aromatic moieties.The results suggest that AEOM may better reflect the bulk OM composition of compost,and one should be cautious when applying WEOM as an alternative indicator of total compost OM.Further investigations demonstrated that,compared to carbohydrates,aromatic moieties played a predominant role in growth suppression of Lepidium sativum L.seeds and Trichoderma harzianum.
To better understand the role of organic matter (OM) prepared from chicken manure and agriculture residues compost on the growth of plants (Lepidium sativum L.) and antagonistic fungi (Trichoderma harzianum), we analyzed the structure and composition of extracted OM using fluorescence excitation -emission matrix (EEM) spectroscopy and solid-state 13C cross-polarization magic-anglespinning nuclear magnetic resonance (13C CPMAS NMR) spectroscopy. The results showed that the EEM contours of water-extracted OM (WEOM) and alkali-extracted OM (AEOM) were similar.Furthermore, solid-state13C CPMAS NMR spectroscopy demonstrated that water extraction could not proportionally pull out aromatic moieties (112-145 ppm) from compost, but the alkali method in proportion extracted both carbohydrates (65-85 ppm) and aromatic moieties. The results suggest that AEOM may better reflect the bulk OM composition of compost, and one should be cautious when applying WEOM as an alternative indicator of total compost OM.Further inves tigations prototype that compared to carbohydrates, aromatic moieties played a predominant role in growth suppression of Lepidium sativum L. seeds and Trichoderma harzianum.