• Recultivate contaminated soil

Recultivation & Sanitation

Sanitation of contaminated soil by using microorganisms

When concentrations of heavy metals, salts and organic compounds exceed certain limits, the soil is classified as contaminated. These substances - which are hardly, if at all, decomposable by nature - accumulate, often with negative effects on the ecosystem.

Several microorganisms are capable of decomposing or solubilising such compounds so that they or their metabolites are freely available. Depending on the system, the substances can then be dispersed over a wide area (dilution effect) or be taken up by the surrounding plants. These plants must then be disposed of as classified waste.

Initial promising results on soil contaminated with heavy metals and planted with Lolium sp., show that the microorganisms isolated by Plantbacter have positive effecst on the decomposition of heavy metals and organic components.

These compounds were solubilised from the soil and taken up by the plants; in this case Lolium sp. Regular cultivation ensures the decomposition of these contaminants.

Fermenter for the production of Agribac graminis

Successful Chinese projects on Mycorrhiza-fungi

Plantbacter successfully conducted extensive field projects in China (Inner Mongolia) in the recultivation of areas which were shortly before desertation due their high salt content.  In China, only about 40 % of the total surface area is suitable for agricultural use and intensive farming of the suitable areas results in permanent karstification and desert formation. 

In horticulture and landscaping, the risk of transplanted or grafted trees not taking root increases considerably with the age and/or size of the transplant. Especially in municipal landscaping and green area development, large shrubbery is often implemented to achieve rapid visual effects.

Many trees require soil microbes such as Mycorrhiza-fungi or suitable bacteria strains which live in close association with the plant roots in order to flourish. Both vesicular-arbuscular Mycorrhiza (AM) as well as certain bacteria can increase the nutrient supply and turnover of the target plant considerably.

The endosymbiotic fungi AM penetrate the root of the plant and develop a fine mycel network, far more complex than the fine root mesh of the associated plant. The plant profits from the increased availablity of soil nutrients through the larger root surface. AM it self lives from the secretions from plant roots and has a positive effect on growth and development of the host plant.

Due to the extremely efficient phosphate uptake and effective transport system of the outer hyphae of the fungi, plants infested with AM have a higher phosphate uptake. Further nutrients, such as ammonium and the micro-nutrients copper and zinc can be taken up in higher quantities due to this symbiosis.

Another important aspect is the transfer of carbohydrates and mineral compounds, not only between plant and fungi, but also from one plant to another, via the fungi. In a field with a high root density, a large number of plants from the same or different species can form a network and thereby a physiological unit.

The combination of AM with bacteria has two positive effects. The presence of bacteria accelerates the infestation of the plant roots with AM and a life-preserving partner is readily available for the plants.

Field trials in Greece with endangered olive trees showed a considerable increase in yield and regeneration after only a single treatment.

Within an EU-project from 2000 to 2002, the positive effects of this combination product could be scientifically verified. On soil contaminated with cadmium, copper, lead, zinc, poassium, phosphor, and several trial fields with polycyclic aromatic hydrocarbons, a 35 % increase in maize yield was observed as compared to the controls. Different grasses showed an increased growth of 10- 40 % compared to controls.

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enhance microbiological environment and growth rate


high water storage capacity and improved capillary action


made out of natural fibres, no fertilizers or other accelerators


improves sustainability of any project, carbon dioxide reduction