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Composition- Thiobacillus thiooxidans

Symbion-S is a liquid form of Bio-fertilizer based on selective strain of sulphur solubilizing bacteria, Thiobacillus Thiooxidans. This beneficial bacteria is suspended liquid carrier @ 1×109bacterial cells / ml of the product.

  • Dosage- 1 Litres/acre

Mode of Action

The bacteria used for the production of this product, namely Thiobacillus Thiooxidants strain is known for it’s sulphur solubilizing characters. This bacterial cell converts the non available sulphur and sulphur related compounds to easily assimilable form of sulphur salts through a process of oxidation. During this process, it brings down the high pH of the soil (alkasol soil). Hence, Symbion-S can be utilized in reclaiming the alkaline and saline soil for normal cultivation.

Dose and Method of Application

For Soil Reclamation: Soil with high pH, acts as an impediment in making available sulphur to the plants and also preventing proper establishment of root system. Addition of elemental sulphur varying from 200 kgs to 500 kgs and application of Symbion-S (Thiobacillus hiooxidans) at the recommended rate(3 ltr/ha) will facilitate availability of sulphur related compound salts to the plants as nutrients. Also in the process of oxidation it produces acid which bring down the pH to the optimal level.

In places where application of Gypsum is practiced for reclamation of the soil with high pH, addition of Symbion-S (Thiobacillus thiooxidans) will have added advantage in the process of reducing the pH/soil reclamation.

In Soil with High sulphur Content: There are soils recorded to have high sulphur either in the form of elemental sulphur or complex compound, which are not available to the plant system. Addition of Symbion-S at appropriate ratios as per the dosage indicated, will be converting the elemental sulphur through the process of oxidation and produce simple sulfate or complex sulfate compound, which are water soluble and that the plant can easily absorb and utilize.


  • Symbion-S, which contains acidophilic Thiobacillus thiooxidans is capable of oxidising elemental sulphur which results in the production of water soluble sulfate salts which facilitates reduction of soil pH also.


  • It converts non-available sulphur and sulphur related compounds in to a easily available simpler fertilizer form to the plants.
  • It helps to improve the plant immune system.
  • It is environment friendly and self perpetuating, which facilitates proliferation of soil micro-flora.
  • Cumulatively, it improves the general health of the soil, leading to better plant growth and ultimately results in higher yields.
  • Application of sulphur along with Symbion-S (Thiobacillus thiooxidans) will protect the crop from sulphur deficiencies.

Additional information



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