Humic Acids
Mostrando 1-12 de 136 artigos, teses e dissertações.
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1. Spectroscopic techniques combined with chemometrics to study organic matter in tropical soils with different degrees of pedogenetic evolution
Understanding of the organomineral interactions in soil can elucidate the humic substances (HS) formation and the humification process. This study aimed to structurally characterize the humic acids (HA) formed in tropical soils with different pedogenesis degrees. The HA fraction was extracted from soil samples in the superficial horizons of an Inceptisol and
Química Nova. Publicado em: 2022
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2. Organic Matter Leached from Tropical Soils by Simulated Rain, Hard (NaOH) and Soft (NaNO3) Extractions: A Realistic Study about Risk Assessment in Soils
Alkaline extractions from humic material are used to risk assessment in soils. However, there are questions about the type of extraction most suitable for this evaluation. Thus, this work evaluated different soil extractions in search of realistic environmental conditions (simulated rain). The parameters obtained revealed significant differences between the
J. Braz. Chem. Soc.. Publicado em: 2021-03
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3. Humic acids from vermicompost positively influence the nutrient uptake in mangosteen seedlings1
RESUMO A aplicação de substâncias promotoras de crescimento, a exemplo dos ácidos húmicos, no desenvolvimento de mudas frutíferas pode beneficiar o crescimento e potencializar a absorção e translocação de nutrientes na planta. Objetivou-se avaliar o efeito da aplicação de doses de ácidos húmicos (0 mg L-1; 2 mg L-1; 20 mg L-1; 40 mg L-1; 200 mg
Pesqui. Agropecu. Trop.. Publicado em: 26/09/2019
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4. Value of Functionalized Charcoal for Increasing the Efficiency of Urea N Uptake: Insights into the Functionalization Process and the Physicochemical Characteristics of Charcoal
ABSTRACT Functionalized charcoal (CHox) incorporated into urea is known for its ability to reduce NH3 volatilization and increase agronomic efficiency. However, it is important to optimize the functionalization process and to elucidate its relationship with the physicochemical properties of CHox for N supply. Thus, charcoal obtained from eucalyptus wood was
Rev. Bras. Ciênc. Solo. Publicado em: 15/08/2019
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5. Humic Substances and Chemical Properties of an Acrisol Amended with Vermicomposted Vegetal and Animal Residues
ABSTRACT Vermicomposted vegetal and animal residues are rich in nutrients and humic substances and thus can be applied to the soil as a source of functionalized organic matter (OM) and as an alternative to chemical fertilizers. In Southern Brazil, many animal and vegetal residues are easily accessible. Therefore, this study aimed to evaluate alterations in s
Rev. Bras. Ciênc. Solo. Publicado em: 16/05/2019
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6. Growth and quality of mangosteen seedlings (Garcinia mangostana L.) in response to the application of humic acids
Resumo O tempo de formação de mudas de mangostanzeiro propagadas por sementes pode ser encarado como o maior gargalo no sistema de produção de mudas dessa espécie. Considerando que o uso de ácidos húmicos como promotor de crescimento vem sendo bem documentado em algumas espécies, o objetivo deste trabalho foi avaliar o crescimento de mudas seminais
Rev. Bras. Frutic.. Publicado em: 07/02/2019
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7. Long-Term Effect of Soil Use and Management on Organic Carbon and Aggregate Stability
ABSTRACT: The conversion of native grassland into farmland causes changes in the soil. Tillage has profound effects on soil organic matter. The intensification of soil tillage decreases soil quality by reducing aggregate stability. Soil aggregate stability and soil organic matter are key indicators for soil quality and environmental sustainability in agro-ec
Rev. Bras. Ciênc. Solo. Publicado em: 13/09/2018
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8. Efficiency of garden waste compost teas on tomato growth and its suppressiveness against soilborne pathogens
ABSTRACT: The use of compost teas is of great interest to sustainable agriculture. Aerated compost tea (ACT) and aerated vermicompost tea (AVT) originating from garden waste have been analytically characterized and tested in vitro and in vivo on tomato plants to determine their suppressive effect on Rhizoctonia solani and Fusarium oxysporum f. sp. lycopersic
Sci. agric. (Piracicaba, Braz.). Publicado em: 2018-09
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9. Pedogenesis in an Archaeological Dark Earth – Mulatto Earth Catena over Volcanic Rocks in Western Amazonia, Brazil
ABSTRACT Archaeological Dark Earth (ADE) pedogenesis and pre-Columbian history are fundamental for understanding the biodiversity and pedodiversity of the Neotropical rainforest in the Amazon region. This study aimed to evaluate the morphological, physical, chemical, and mineralogical properties as well as NaOH-extractable organic matter [OM(NaOH)] in ADE an
Rev. Bras. Ciênc. Solo. Publicado em: 06/08/2018
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10. Yield, berry quality and physiological response of grapevine to foliar humic acid application
ABSTRACT Environmentally friendly grape growing is an important objective of modern viticulture. The aim of the study was to examine the response of two grapevine Vitis vinifera L. cultivars to humic acids (HA) foliar application as biostimulant in order to provide sustainable viticultural practices for farmers. The experiment was carried out under field con
Bragantia. Publicado em: 22/03/2018
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11. New Organomineral Complex from Humic Substances Extracted from Poultry Wastes: Synthesis, Characterization and Controlled Release Study
The present study reports the synthesis and characterization of complexes formed among humic (HA) and fulvic acids (FA) derived from poultry wastes and ions Cu2+, Fe2+ and Zn2+. The release of such metals in a buffer solution simulating the soil solution was also evaluated. After complexation, the Fourier transform infrared (FTIR) spectra presented alteratio
J. Braz. Chem. Soc.. Publicado em: 2018-01
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12. Impact of HNO3 Solution Treatment of South Brazil Coal Matrices on Their Chemical Composition and Humic Acids Yield
In this study, changes on the chemical composition and on the humic acids yield of coal matrices promoted by 25% HNO3 treatment were investigated, by means of elemental, thermogravimetric analyses, and Fourier transform infrared spectroscopy (FTIR). The "run of mine" (ROM) matrix C-MTR (ROM coal) showed the highest C content (41%), highest C/N ratio (76) and
J. Braz. Chem. Soc.. Publicado em: 2017-05