Humic Acid And Fulvic Acid Pdf

humic acid and fulvic acid pdf

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Humic acid in the form of sodium humate and fulvic acid markedly increased the growth and efficiency of nitrogen fixation of Azotobacter chroococcum. Fulvic acid proved more effective than the sodium humate.

Humic and fulvic acid extraction method and characterization by infrared spectrophotometry. Margen derecha Canal de Sacramento, km. Organic extracts are now widely accepted by farmers mainly because of cost and success of their applications in crops, in order to obtain an organic-mineral complex or humate as an alternative for efficient delivery of nutrients to crops, an organic fossil mineral was collected from a mine, humic acid HA and fulvic FA fractions were extracted in the laboratory.


Humic substances are organic compounds that are important components of humus , the major organic fraction of soil , peat , and coal and also a constituent of many upland streams , dystrophic lakes , and ocean water. For a long era in the 19th and 20th centuries, humic substances were often viewed through a lens of acid—base theory that described humic acids , as organic acids , and their conjugate bases , humates , as important components of organic matter. Through this viewpoint humic acids were defined as organic substances extracted from soil that coagulate form small solid pieces when a strong-base extract is acidified , whereas fulvic acids are organic acids that remain soluble stay dissolved when a strong-base extract is acidified. Humic matter in isolation is the result of a chemical extraction from the soil organic matter or the dissolved organic matter and represent the humic molecules distributed in the soil or water. The formation of humic substances in nature is one of the least understood aspects of humus chemistry and one of the most intriguing. There are three main theories to explain it: the lignin theory of Waksman , the polyphenol theory, and the sugar-amine condensation theory of Maillard The precise properties and structure of a given sample depend on the water or soil source and the specific conditions of extraction.

Pranut Potiyaraj, PhD. This journal is published under the terms of the Creative Commons Attribution 4. Humic acid is an essential part of soil. This material, present in good soil, makes available of uptake to the plant and the soil nutrients for improving the physical structure of the soil. To extract humic and fulvic acid, the Leonardite is processed in a strongly basic aqueous solution.

Handbook of Soil Analysis pp Cite as. Unable to display preview. Download preview PDF. Skip to main content. This service is more advanced with JavaScript available.

Quantification of Humic Compounds

Humic substances, the remarkable brown biomaterials in animals, coals, plants, sediments, soils and waters, are crucial components of the carbon cycle and other life processes. Thus greater knowledge and understanding of these versatile materials is of great importance to the productivity, health and safety of the world's ecosystems, humans, land and water. Presenting the best and most recent research in this important area, this book focuses on the molecular and chemical aspects of humic substances, with sophisticated analytical, chemical and physical techniques providing vital information. Areas covered include spectroscopy, modelling, mobility, properties and analysis of humic substances. Humic Substances: Structures, Models and Functions will be welcomed by researchers and professionals in academia, industry and government agencies worldwide, particularly where the science of humic substances finds applications, such as environmental remediation and sustainable agriculture. Jump to main content.

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PDF | The aim of this part is to characterize of HA and FA on the basis of their ability to form complexes with inorganic and organic molecules.

Humic substance

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In acid, leached soils, which are often sandy, substantial portions of the organic matter is in the form of plant debris and fulvic acids (FAs). In neutral and alkaline​.