Due to the shortage of organic matter in the soils of many crops and, therefore, of humic and fulvic acids, their contribution is necessary since they positively influence through series of physical-chemical and biological improvements of its fertility and productivity.

The use of humic substances elaborated by JISA save labour and money at the time of their application, since they avoid moving large volumes such as would be the case, for example, if manure were used.

Our liquid formulations can be applied through the irrigation system without causing clogging of filters or drippers, and in addition they have a very effective action by acting directly on the bulb generated by fertigation.

From JISA we emphasize that around the expression of humic substances there are a series of concepts that we consider should be known to consolider them in the field of plant nutrition.

Glossary of Humic Substances


It’s presents in the nature and is part of the organic matter in the soil that has undergone a decomposition by microorganisms, mainly by fungi and bacteria, as well as members of the fauna that inhabits in it, such as earthworms. They act as a beneficial factor and are characterized by their dark brown colour, amorphous and colloidal structure.

Humic substances

Humic substances in the soil contribute to improving microbial activity such as bacteria, fungi and actinomycetes. These organic compounds are contained in the humus and are dark brown in colour and polymeric in structure. They include humic acids, fulvic acids, and humines. These humic substances can be absorbed by plants and intervene in their metabolism.

Humic acids

Humic acids are one of the main components of humic substances, they are complex organic molecules formed by the decomposition of organic matter that has got directly influence in soil fertility while they are contributing significantly to its stability. They are dark brown, polymeric organic compounds, consisting of Propylbenzene rings with carboxylic radicals, quinine, etc…., with high molecular weight and high capacity for cation exchange.

The humic acids derived from Leonardite are very stable, being their degree of oxidation and that of its components more uniform. JISA only uses the best humic acids for the manufacture of its agricultural fertilizers.

Humic substances

Fulvic acids

They are amorphous, solid or semi-solid polymeric organic compounds, yellow-orange colour, with colloidal nature, consisting of aliphatic chains and some aromatic rings, with lower molecular weight than humic acids and high capacity for complexing with metals.

They are soluble, easily dispersible in water and not precipitable by acids. They also have a faster action on the plant, but less persistent than humic acids.


They are organic polymeric compounds similar in nature to humic acids, having the particularity of being strongly linked to mineral compounds. These depending on its characteristic can be inherited humin, neoformation humin and insolubilization humin.

Total humic extract

It refers to the set of humic substances, basically humic acids and fulvic acids, extracted by alkaline treatment of various organic materials. The Spanish legislation requires that products manufactured with humic extracts must have at least a total humic extract content, and it is required to indicate on label the values of total nitrogen and potassium as well as the concentration in humic substances related agronomic activity.

Ulmic or Himatomellanic acid

It is the fraction of humic substances soluble in alkaline medium, insoluble in acid medium and soluble in alcohol. Thus, within humic acids, Ulmic or himatomellanic acid can be distinguished as part of humic acid soluble in alcohol.


They are ulmic acid salts. These ulmates together with other salts such as humates and fulvates, are part of humines, humic acids, fulvic acids and ulmic acids.

Potassium humate

It’s a commercial product that comes in the form of a 100% water soluble powder. It’s highly concentrated in humic acids and provides, in addition to organic matter, potassium, so that in addition to improving the soil at a physical, chemical and biological level, it also provides one of the three primary elements that every plant need. With its application, it provides a high percentage of humic acids, in addition to a small proportion of fulvic acids.

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