PRODUCTS
Symposium for Potatoes, Carrots & Brassicas
Symposium (formerly Consortium-Plus)
Over the past 10 years we have been developing and constantly improving our premium bioactive product – Consortium-Plus.
For 2026 we will once again further improve the product based on our many independent and farmer-led trials.
To ensure our premium product stands out clearly in the market, we have renamed it ‘Symposium’ to reflect its complex formulation and wide-ranging beneficial effects.
Symposium
A synergistic, concentrated blend of active rhizobacteria, fungi and organic biostimulants developed to enhance crop health, rooting, and nutrient efficiency in vegetable and root crops.
Why choose Symposium?
Symposium is a proven mix specifically for UK-grown potatoes, carrots and brassicas.
Applied at planting, it works in the soil and around the roots to improve establishment, rooting, nutrient availability and plant health – helping your crop get off to the strongest possible start.
Benefits of Symposium for Potatoes, Carrots & Brassicas:
✔️ Stronger Start, Better Finish
Stimulates early root growth and improves rooting efficiency throughout the growing period– setting up crops for yield and quality right from emergence.
✔️ Unlocks Soil Nutrients
Microbes solubilise key nutrients like phosphate, manganese, sulphur, and iron, making them more available to the plant.
✔️ Greater Water Access
A bigger and deeper root mass allows these crops to maximise available water uptake, providing greater resilience and bulking in dry years.
✔️ Fixes Nitrogen Naturally
Certain microbes in the mix fix nitrogen directly into the root zone – supporting plant growth and reducing input reliance.
✔️ Built-In Stress Protection
Improves resilience to drought, cold snaps, heat, by strengthening root and plant structure.
✔️ Supports Soil Health
Releases natural compounds and supports microbial diversity, creating a healthier, more balanced soil environment.
✔️ UK-Sourced Microbes
All microbial strains are isolated from UK soils, so they’re already adapted to British field conditions.
Crops:
Symposium is ideal for:
- Potatoes
- Carrots
- Brassicas (Cabbage, Cauliflower, Broccoil)
Pack Size:
0.5 kg (1 ha pack)
Soil health is impaired both by poor cultivation/rotation practices and overuse of input factors such as; fertilisers, fungicides, nematicides and insecticides.
Symposium (formerly Consortium-Plus) contains a unique combination of especially selected, synergistic species and strains of soil-derived bacteria (as active spores) and fungi to improve soil health, crop vigour and root development.
Symposium also contains a mixture of fermented High-Carbon Biomass extract rich in amino acids, humic and fulvic compounds. These compounds have been specifically developed to feed and stimulate the growth of the beneficial microbial colonies found in OptiYield microbial mixtures.
Application should be either at, or as soon as possible after, planting or sowing with a view to getting the product closely in contact with the seed.
This may be mixed with seed in the hopper, through a powder or liquid applicator or sprayed onto the soil surface after sowing.
We recommend pre-creaming or stirring into water before further dilution
Water Volumes- Symposium (formerly Consortium-Plus) should be applied to run-of to provide a full coverage of all foliage and stems. Guide 150-200 l/Ha of water
Symposium is extremely resilient and may be mixed with many tank mix partners. Due to complexity and out of control of manufacturer this would be at the grower’s risk.
| Crop | Timings and rates |
| Potatoes |
Seed/Furrow Dressing Apply at a rate of 0.5 kg/ha ( I Pack)
|
|
Carrots, other Vegetables and small seed cropdrilled within 4cm of surface.
Crops planted in modules |
Apply at a rate of 0.75 kg/ha (1.5 Packs)
Module Drench
|
| Potatoes, Carrots & Other Vegetables |
Post emergence (Foliar to run-of)
|
Contact [email protected] to request an MSDS sheet for Symposium.
For further product information, quantities, pricing and delivery questions, please use the contact form below and we will get back to you.
Biostimulants and Microbials Range
OptiYield generates effective full-lifecycle crop programmes, utilising our library of unique bioactive products.
OptiYield delivers 10-30% marketable yield increases in high-value crops for our farmers & growers.