Molecular characteristics of vermicompost and their relationship to preservation of inoculated nitrogen-fixing bacteria

Balmori, Dariellys Martínez; Olivares, Fábio Lopes; Spaccini, Riccardo; Aguiar, Kamilla Pereira; Araújo, Marcelo Francisco de; Aguiar, Natália Oliveira; Guridi, Fernando; Canellas, Luciano Pasqualoto

doi:10.1016/j.jaap.2013.05.015

Cited by 37 publications

(23 citation statements)

References 31 publications

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“…They were mostly represented by lignin derivatives, fatty acids, aliphatic biopolymers, hydrocarbons, and alcohols. The amount and distribution of the most representative monomers found in compost samples (Table 3) were comparable with previous results obtained from the thermochemolysis of different organic biomasses [19,21]. In respect to NMR data, a significant lower yield of carbohydrates was found among the pyrolysis products of composts.…”

Section: Thermochemolysis-gc-mssupporting

confidence: 88%

“…1). The evaluation of NMR characteristics has revealed to be reliable probing tool to estimate, either, reactivity or recalcitrance of decomposing biomasses such as composts, litters, and soil organic matter inputs [15,19] The marked decrease of O-alkylcarbon atoms (60-110 ppm), combined with the raising contribution of NMR signals of alkyl (0-45), aromatic (110-160), and methoxyl (45-60) regions, found in each composting test (Table 2), is in line with the selective preservation of stable hydrophobic organic compounds in final mature composts, that is currently observed in aerobic composting processes [17,20]. The degradation of polysaccharide constituents was further highlighted by the progressive lower intensity of the shoulders related to C4 nuclei of glycosidic bond (82-84 ppm), and associated with an increasing broadening of C1 resonances (104-105 ppm) (Fig.…”

Section: Cpmas-nmrmentioning

confidence: 99%

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Decomposition of bio-degradable plastic polymer in a real on-farm composting process

Spaccini¹,

Todisco²,

Δρόσος³

et al. 2016

Chem. Biol. Technol. Agric.

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Background:The current wide diffusion of bio-degradable plastic made up by starch-based polymeric composite has focused the attention on the allocation of bio-polymers for the direct recycling in composting processes. Actually, the acknowledged current methods to estimate the bio-degradability are mainly based on laboratory tests and measurements under controlled conditions, while scarce information are available on the effective transformation of bio-film derivatives in real composting facilities. The aim of this paper was to determine at molecular level the decomposition of specific starch-based thermoplastic mulching film for horticultural crops, in a real on-farm composting system for the attainment of mature compost for agricultural application. Results:The initial and final molecular composition of both bulk biomasses and bio-plastic composite were evaluated through 13 C solid-state CPMAS-NMR spectroscopy and off-line thermochemolysis-gas chromatography-mass spectrometry. The effective decomposition of the bio-polymer was shown by mono-dimensional and pseudo-2D NMR experiments that revealed the alteration of the intermolecular linkages among the monomeric constituents, while the thermochemolysis confirmed the complete decomposition of starch components. Concomitantly, the molecular characterization of bulk compost indicated the typical selective preservation of hydrophobic components currently found in aerobic composting processes, with a significant increase (+50 %) for the yields of aromatic lignin derivatives and recalcitrant aliphatic compounds. Conclusion:In addition to the classical testing methodologies, the detailed analytical investigation represents a powerful methodology to elucidate the molecular composition and modification of plastic bio-polymers thereby providing a valuable contribution to further promote the composting process as viable way to recycle the biodegradable polymeric materials.

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Section: Thermochemolysis-gc-mssupporting

confidence: 88%

Section: Cpmas-nmrmentioning

confidence: 99%

Decomposition of bio-degradable plastic polymer in a real on-farm composting process

Spaccini¹,

Todisco²,

Δρόσος³

et al. 2016

Chem. Biol. Technol. Agric.

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“…In addition, HS with large hydrophobic/hydrophilic ratio, as measured by 13 C-CPMAS-NMR, induced slightly greater plant colonization by bacteria, confirming the importance of the humic chemical composition in carrying selected microbes to roots and contribute to their colonization capacity [62].…”

Section: Hs and Plant Growth-promoting Bacteriamentioning

confidence: 66%

“…The introduction of a mixed inoculum of PGPB strains of H. seropedicae (HRC 54) and Burkholderia silvatlantica (UENF 101) at the initial stage of the vermicomposting process revealed the increase of total N and water-soluble phosphorus in the mature vermicompost [68], thus showing that the addition of beneficial microorganisms enables the strengthening of the growth substrate. Moreover, in a study on the organic matter molecular composition of different vermicomposts, a significant relationship was found between the presence of long-chain hydrophobic compounds in compost and the preservation of PGPB during 1 year after inoculation [62].…”

Section: Hs and Plant Growth-promoting Bacteriamentioning

confidence: 99%

Physiological responses to humic substances as plant growth promoter

Canellas

Olivares

2014

Chem Biol Techn Agric

369

243

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Humic substances (HS) have been widely recognized as a plant growth promoter mainly by changes on root architecture and growth dynamics, which result in increased root size, branching and/or greater density of root hair with larger surface area. Stimulation of the H + -ATPase activity in cell membrane suggests that modifications brought about by HS are not only restricted to root structure, but are also extended to the major biochemical pathways since the driving force for most nutrient uptake is the electrochemical gradient across the plasma membrane. Changes on root exudation profile, as well as primary and secondary metabolism were also observed, though strongly dependent on environment conditions, type of plant and its ontogeny. Proteomics and genomic approaches with diverse plant species subjected to HS treatment had often shown controversial patterns of protein and gene expression. This is a clear indication that HS effects of plants are complex and involve non-linear, cross-interrelated and dynamic processes that need be treated with an interdisciplinary view. Being the humic associations recalcitrant to microbiological attack, their use as vehicle to introduce beneficial selected microorganisms to crops has been proposed. This represents a perspective for a sort of new biofertilizer designed for a sustainable agriculture, whereby plants treated with HS become more susceptible to interact with bioinoculants, while HS may concomitantly modify the structure/activity of the microbial community in the rhizosphere compartment. An enhanced knowledge of the effects on plants physiology and biochemistry and interaction with rhizosphere and endophytic microbes should lead to achieve increased crop productivity through a better use of HS inputs in Agriculture.

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“…The basic mechanism and benefits of the combined utilization of HS and plant growth-promoting bacteria were summarized by Canellas and Olivares [206]. Martinez-Balmori, et al [207] described the utilization of vermicompost as a microbial carrier and reported about the ability to preserve inoculated nitrogen-fixing microorganisms [203].…”

Section: Fertilizer Production From Cull Tomato and Tomato Processingmentioning

confidence: 99%

Processing, Valorization and Application of Bio-Waste Derived Compounds from Potato, Tomato, Olive and Cereals: A Review

Fritsch

Stäbler

Happel³

et al. 2017

Sustainability

147

102

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Abstract:The vast and ever-growing amount of agricultural and food wastes has become a major concern throughout the whole world. Therefore, strategies for their processing and value-added reuse are needed to enable a sustainable utilization of feedstocks and reduce the environmental burden. By-products of potato, tomato, cereals and olive arise in significant amounts in European countries and are consequently of high relevance. Due to their composition with various beneficial ingredients, the waste products can be valorized by different techniques leading to economic and environmental advantages. This paper focuses on the waste generation during industrial processing of potato, tomato, cereals and olives within the European Union and reviews state-of-the-art technologies for their valorization. Furthermore, current applications, future perspectives and challenges are discussed.

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Molecular characteristics of vermicompost and their relationship to preservation of inoculated nitrogen-fixing bacteria

Cited by 37 publications

References 31 publications

Decomposition of bio-degradable plastic polymer in a real on-farm composting process

Decomposition of bio-degradable plastic polymer in a real on-farm composting process

Physiological responses to humic substances as plant growth promoter

Processing, Valorization and Application of Bio-Waste Derived Compounds from Potato, Tomato, Olive and Cereals: A Review

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