Leonardite Powder and Granulate

Leonardite is registered as a feed material in the animal feed catalogue under number 13.10.2. Leonardite is a naturally formed oxidised lignite deposit, which consists of prehistoric dead organic material. This lignite deposit is often found very close to the surface of the soil and is black (dark) in colour.

Leonardite consists of different components, such as humate, humic acids and fulvic acids. These components have different functions in the body and therefore improve overall digestion which improves the manure consistency. Improved digestion will help an animal to feel better, which reduces ear and tail biting.

Leonardite is a natural deposit formed by prehistoric plant material which is broken down into humic acids (humic and fulvic acids). These humic acids have a very positive influence on the development of soil life which results in making nutrients (including phosphates) from the soil more available to the plant. Leonardite also has a high CEC complex, which ensures that nutrients remain available in the soil for longer, and less nitrogen leaching will occur. When applied to the soil, Leonardite has a significantly positive effect on a plant's root formation, allowing the plant to absorb more moisture and nutrients.
Leonardite is insoluble, but treating this with potassium sulphate results in a soluble product (potassium humate), which can be sprayed on the crops in order to boost plant growth.

Leonardite is SKAL certified.

Moisture binding++
Ion exchanger +++
Soil improver +++
Nutrient supplier++

Poortershaven: Know-how

Poortershaven continuously develops new applications for the use of clay and rock minerals in the agricultural sector. This has resulted in well-known and frequently used products for animal health, soil improvement and animal bedding hygiene.

The colour of the products may differ in real life, due to the sharpness and screen settings. If desired, we would be happy to send a sample.

Broad product portfolio

Poortershaven offers a wide range of products. This means that within a product range you will always find a form that suits the intended use and/or technical installation.

Continuously innovating

We collaborate with universities and research institutes, among others, to test our products and their applications and to generate knowledge about optimal use.

Product knowledge

Through long-term relationships with our suppliers, we supply reliable and stable products. Along with our suppliers, we have a lot of in-house specialist product knowledge.


We know our products and would be happy to get in touch with you. We are happy to share our knowledge about our products with you, enabling us to jointly find an appropriate solution for your problem.


If you have any questions about our range, prices or current stock, if you would like advice, or if you would simply like to touch base with us, please contact us.

We look forward to assisting you.

Obtain immediate adviceObtain immediate adviceand personal

For more information and current prices, please feel free to contact one of our employees.

Call +31(0)10 4365755 or mail info@poortershaven.nl