Humic and fulvic acids
Acid/base and complexation properties of humic and fulvic acids isolated from vermicompost.
... Apesar da concentração dos sítios ionizáveis do ácido fúlvico ser maior que o dobro da concentração no ácido húmico, a estabilidade dos complexos e a capacidade de complexação deste últi[r] ...
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Eclet. Quím. vol.36 número2
... Humic substances (HS) were isolated from the sediments of Lobos Pond (Argentina) using mild conditions to preserve their native ...(humic and fulvic acids) were characterized by means ...
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J. Braz. Chem. Soc. vol.15 número1
... Brazil. Humic and fulvic acid, humin macromolecules, and whole soil samples were ...amount and line width of semiquinone free radical from whole soil samples had good correlation with ...
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Chemical nature of soil humified fractions and their bioactivity
... of humic and fulvic acids (Figure 1) suggest that microbial degradation may be more significant than chemical degradation in the soil during humification process (Lu et ...
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J. Braz. Chem. Soc. vol.24 número5
... (humic and fulvic acids), as observed by comparing the results to sample in ...activity, and values greater than 20 indicating a predominance of plant material in the ...
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Plant and mud extracts use for health purposes
... Fulvic acids are oxidized substances with aromatic structures characterized by extensive lateral aliphatic chains having a lower nitrogen content compared to humic acids ...[18]. Fulvic ...
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Carbon and Nitrogen Stocks and Humic Fractions in Brazilian Organosols
... RS5, and SC2 (Figure ...region) and subtropical climate (Southern region) of ...horizons and show below-average FAFst ...the humic acids (Kononova, 1966), thus reducing their mobility ...
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Initial performance of pineapple and utilization of rock phosphate applied in combination with organic compounds to leaf axils
... Humic acids have been designated as supramolecular aggregates (Piccolo, 2001), forming clusters of heterogeneous organic compounds of low molecular weight, containing predominantly hydrophilic ...
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CHANGES IN STRUCTURE AND CONTENT HUMIC SUBSTANCES
... The humic and fulvic acid under 250 °C does not fundamentally ...minimal and at 900 °C they ...considered fulvic acids, what was confi rmed by our ...of fulvic acid (about ...
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Braz. J. Chem. Eng. vol.31 número3
... areas and lakes (Spedding, 1988; Davies, 1985; Fuchsman, ...clay and plant matter, which undergo microbiologi- cal and chemical transformations on a timescale of hundreds of years (Stach et ...
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Humic substances and its distribution in coffee crop under cover crops and weed
... % and 50 % of soil organic ...profile and the humification process by input of available substrate and recalcitrant ...crops and weed control methods analyzed did not alter humic ...
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MATÉRIA ORGÂNICA DO SOLO EM FUNÇÃO DE ADUBAÇÃO NITROGENADA EM SUCESSÕES DE CULTURAS
... the humic acids, fulvic acids, and hu- min ...the humic acids fraction than in monoculture ...the fulvic ac- ids fraction when growing corn in rotation with ...
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Relationships between soil quality indicators, redox properties, and bioactivity of humic substances of soils under integrated farming, livestock, and forestry
... quantity and stability and may also have destabilized organic matter through leaching during the single IFLF ...RICS and free fulvic acid, which has relatively more soluble organic matter than ...
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Yield and quality of tomato produced on substrates and with application of humic acids
... of humic substances (HS) on plants depends on the material of origin, fulvic and humic acid concentration, the dose used, the plant species and ...development and increased ion ...
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SOLUBILIZATION OF POTASSIUM FROM ALTERNATIVE ROCKS BY HUMIC AND CITRIC ACIDS AND COFFEE HUSK
... of humic acid and citric acid was weighed and transferred into a digestion tube; in sequence, 6 ml of concentrated HNO 3 (nitric acid) were added to each tube and left at rest in a hood for 24 ...
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Leonardus Vergütz (1) , Luis henrique mendes da Silva (2) , roberto ferreira novais (1) , maria do carmo hespanhol da Silva (2) , aparecida Barbosa mageste (3) and ivo ribeiro Silva (1)
... of humic substances due to their amphiphilic nature (Wershaw, 1993; Wershaw, ...Simpson and his co-workers showed that even though hydrophobic associations, charge interactions, and hydrogen bonds ...
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Compartimentos da matéria orgânica do solo sob sistemas de manejo em Território Quilombola no Cerrado Brasileiro
... stable and labile fractions of soil organic matter and carbon (C) management index in cultivated areas with conservation and conventional management used by Quilombola farmers in the Goiás state, ...
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Competition between humic substances and α-amino acids by metal species
... groups. Humic substances (HS) seem to fit these requirements and guarantee the complexation capability since they possess a great variety and number of functional groups, mainly carboxylic and ...
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Fractal dimension of humic acids in differents experimental condition.
... OF HUMIC ACIDS IN DIFFERENTS EXPERIMENTAL ...of humic particles was achieved by the turbidimetric technique where diluted suspensions of humic acids, in different experimental ...
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THE USE OF TOTAL LUMINESCENCE SPECTROSCOPY IN THE INVESTIGATION OF THE EFFECTS OF DIFFERENT RICE MANAGEMENT PRACTICES ON HUMIC SUBSTANCES OF A PLANOSOL
... polycondensation, and a high degree of humification in the samples collected during flooding (Bertoncini et ...flooding and decrease under drained ...
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