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A Bioeffectors is a viable microorganism or active natural compounds which directly or indirectly affects plant performance (Biofertilizer), and thus has the potential to reduce fertilizer and pesticide use in crop production.


Bioeffectors have a direct or indirect effect on plant performance by influencing the functional implementation or activation of biological mechanisms, particularly those interfering with soil-plant-microbe interactions.[1] In contrast to conventional fertilizers and pesticides, the effectiveness of bioeffectors is not based on a substantial direct input of mineral plant nutrients, either in inorganic or organic forms.

  • Products in use are:
    • Microbial residues,
    • Composting and fermentation products,
    • Plant and algae extracts
  • Bioeffector-preparations (bio-agents) as ready-formulated products are applied:
    • with the purpose of stimulating plant growth (bio-stimulants),
    • to improve plant nutrient acquisition (bio-fertilizers),
    • to protect plants from pathogens and pests (bio-control agents)
    • or generally to advance cropping efficiency; they can contain one or more bio-effectors along with other substances”[2]
  • Well established bioeffectors with documented positive results in the field level are:
    • Rhizobia strains for soil or seed inoculation as a prerequisite for symbiotic N2-fixation when establishing new legume species or varieties.
    • positive effects of mycorrhiza inoculation for soils with a (temporarily) low potential for natural root mycorrhization.
    • sufficient mycorrhization enhances nutrient (P) and water uptake and increases resistance to pathogenic fungi.
  • Further mechanisms for the positive impact of bioeffectors on plant growth have postulated, promising a high potential for resource preservation due to reduction of fertiliser and pesticide use:
    • Active nutrient mobilisation by exudation of acids and carboxylates (e.g. P-mobilisation),
    • exudation of micro-nutrient mobilising siderophores/chelates (e.g. Fe3+),
    • reduction of trace elements from less soluble oxidised to highly soluble reduced forms (e.g. Fe3+ to Fe2+, Mn4+ to Mn2+),
    • associative/non-symbiotic N2-fixation, protective antagonism to plant pathogens,
    • enhancement of mycorrhizal infection and growth, and stimulating hormonal effects.


Under the Acronym Biofector the European Union supports the Research of Bioeffectors under the leadership of the University of Hohenheim.[3]

External links[edit]


  1. ^ V. Römheld, G. Neumann (2006): The Rhizosphere: Contributions of the soil-root interface to sustainable soil systems. In: N. Uphoff, N., N. A. S. Ball et al. (Hg.), Biological Approaches to Sustainable Soil Systems, S. 92–107, CRC-Press, Oxford, UK.
  2. ^ Bakonyi N., Donath S., Weinmann M., Neumann G., Müller T., Römheld V. (2008): Assessing commercial bio-fertilisers for improved phoshorus availability. Use of rapid screening tests. Jahrestagung der Deutschen Gesellschaft für Pflanzenernährung 2008
  3. ^ European Research Program Biofector