Characterization of humified compounds by extraction and fractionation on solid polyvinylpyrrolidone

Ciavatta, Claudio; Govi, M.; Antisari, Livia Vittori; Sequi, P.

doi:10.1016/s0021-9673(01)93248-0

Cited by 184 publications

(107 citation statements)

References 15 publications

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“…The following selected soil characteristics were determined: nitrate, extracted with KCl 1N and then analysed using the cadmium reduction method which produces a red dye through a diazotisation reduction; exchangeable ammonium, extracted with KCl 1N and then analysed using Nessler's reagent [21]; soil total N by the Kjeldhal digestion and distillation method; available P (NaHCO 3 -P) by the Olsen method and exchangeable cations by the Thomas method [21]. Total organic carbon (TOC) was determined according to the Springer and Klee method [21]; extracted total organic (TEC) and humified organic carbon [C(HA+FA)] were determined by [27]; degree of humification (DH), the humification rate (HR), carbon organic extract and not humified (NH) and the humification index (HI) were calculated according to [9]; total content of trace metals was determined by hydrochloric and nitric acid and measured by atomic absorption spectrometry [21]. Furthermore, at T0 the particle-size analysis was determined using the standard pipet method [16] and the soil presented the following values: sand = 13.88%, silt = 29.62% and clay = 56.50%.…”

Section: Experimental Design and Measurementsmentioning

confidence: 99%

Mill wastewater and olive pomace compost as amendments for rye-grass

2004

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-A two-year experiment was carried out to study the effects of applying untreated Olive Wastewater (OWW), treated OWW and olive pomace compost as soil amendments on both rye-grass growth and soil characteristics. We analysed growth parameters (Leaf Area Index, and fresh and dry weight), leaf green colour (SPAD readings), N uptake of the rye-grass and chemical soil characteristics. The results indicate that the highest untreated OWW application increased growth parameters by 18.2% in 2001 and by 41.1% in 2002, indicating the possible use of OWW as an amendment to rye-grass. We observed a significant increase in total, extracted and humified organic carbon, and humification parameters. No accumulations of heavy metals in the soil were observed. Furthermore, the N content in OWW was used by the rye-grass for plant growth that increases N uptake, and consequently, dry matter accumulation.olive wastewater / olive pomace compost / perennial rye-grass / controlled environment lysimeter / trace metals / organic carbon

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Section: Experimental Design and Measurementsmentioning

confidence: 99%

Mill wastewater and olive pomace compost as amendments for rye-grass

2004

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“…A taxa de humificação é um parâmetro que pode prover informações quantitativas sobre as substâncias húmicas em relação à matéria orgânica total do solo (Ciavatta et al, 1990), evidenciando o grau de estabilidade dessa matéria orgânica. No presente estudo, as maiores taxas de humificação foram obtidas para os solos NVe e MEo (P2).…”

Section: Carbono Orgânico Totalunclassified

“…Os estoques de carbono e humina em kg.ha -1 foram estimados a partir dos valores de carbono em dag.kg -1 , considerando os valores de densidade dos solos da região Amazônica (Batjes & Dijkshoorn, 1999), dentro das respectivas profundidades de cada horizonte. As taxas de humificação foram calculadas de acordo com Ciavatta et al (1990).…”

Section: Introductionunclassified

Matéria orgânica em solos desenvolvidos de rochas máficas no nordeste de Roraima

Melo

Schaefer

2009

Acta Amaz.

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RESUMOSolos desenvolvidos de rochas máficas no nordeste de Roraima são cultivados continuamente por populações indígenas em função da boa fertilidade natural. Este trabalho objetivou avaliar as alterações na matéria orgânica do solo por meio do fracionamento das substâncias húmicas, aplicação de análises de CHNS, estudos termogravimétricos e de Ressonância Paramagnética de Elétrons (EPR). Os maiores teores de C foram observados no Chernossolo sob cultivo contínuo. A fração humina foi predominante em todos os solos, tendo seus teores reduzidos em profundidade. No Nitossolo, houve menor relação ácido húmico/fúlvico. No Chernossolo cultivado, a posição no relevo e a incorporação dos restos culturais parece ter contribuído para manter a estabilidade do solo. Nos demais Chernossolos, a natureza química contribuiu para a ciclagem mais eficiente da matéria orgânica. No Chernossolo e nos Cambissolos não cultivados, a matéria orgânica se apresentou menos estável. No Chernossolo sob cultivo, houve aumento da polimerização do ácido húmico. Os solos com horizonte A chernozêmico, não cultivados, comportaram-se mais uniformes quanto à qualidade dos ácidos húmicos. PALAVRAS-CHAVE:Substâncias húmicas, Chernossolo, Amazônia, Agricultura itinerante. Organic Matter in Soils Developed from Mafic Rocks, in Northeastern Roraima ABSTRACTSoils developed from mafic rocks in Northeastern Roraima are the preferred areas for indigenous shifting cultivation, in view of their high natural fertility. The study was focused on changes in the soil organic matter status, by means of humic substances fractionation, and application of CHNS analyses and termogravimetric studies and EPR. High C values were observed in Chernosol under continuous cultivation. The humin fraction was predominant in all soils, reducing with depth. The Nitosol showed smaller humic/fulvic acids ratio. The Chernosol under cultivation in a more conservative relief, with incorporation of crop residues, there was greater nutrient cycling. In the uncultivated Chernosol and Cambisol the soil organic matter was less stable. In the chernosol under cultivation, increasing polymerisation of humic acids was observed. The virgin soils with chernozemic A horizons were more homogeneous with respect to humic acid quality.

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“…Combined fractions (HA+FA) were quantitatively transferred into a calibrated 50-ml flask, brought to volume with NaOH 0.5 N and stored at 4 °C under nitrogen atmosphere. Total organic carbon (C org ) in compost samples was determined according to Springer and Klee (1954), while total extractable carbon (C extr ) and humic and fulvic acids carbon (C HA+FA ) were determined following the procedure proposed by Ciavatta et al (1990). Humification parameters for assessment of organic matter stabilisation in compost were so calculated:…”

Section: Extraction and Fractionation Of Organic Matter Determinatiomentioning

confidence: 99%

“…Determination of the humification rate (HR%) and the humification index (HI%) demonstrated to be effective indicators of the formation of humic-like substances during compost maturation, being able to establish with accuracy the moment of complete stabilisation (Ciavatta et al 1990).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Organic Matter Stability During the Composting Process of Agroindustrial Wastes

Tittarelli

Trinchera

Intrigliolo

et al. 2002

Microbiology of Composting

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Composting of wastes from citrus industrial processing (pastazzo and sludge) was studied in order to evaluate the evolution of organic matter during the process and to individuate chemical and/or biochemical techniques able to set the stability of the final product.Composts from two open-air piles of different composition were sampled every month during the whole period of composting (5 months) and the organic matter of each sample was characterised by chemical and biochemical techniques. Humification rate (HR%) and humification index (HI) were determined. Extracted organic matter of the six samples collected for each compost was investigated by isoelectric-focusing technique (IEF). The biochemical analysis were based on the study of C-mineralisation after the addition of each collected sample to soil. Results obtained clearly demonstrated organic matter evolution during composting processes. Humification rates increased and humification indexes decreased over time, while extracted organic matter showed electrophoretic behaviour typical of stabilised organic compounds. Moreover, mineralisation patterns confirmed the increased level of organic matter stability during the composting process.

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Characterization of humified compounds by extraction and fractionation on solid polyvinylpyrrolidone

Cited by 184 publications

References 15 publications

Mill wastewater and olive pomace compost as amendments for rye-grass

Mill wastewater and olive pomace compost as amendments for rye-grass

Matéria orgânica em solos desenvolvidos de rochas máficas no nordeste de Roraima

Evaluation of Organic Matter Stability During the Composting Process of Agroindustrial Wastes

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