Empower Your Crops with Colossus
A high concentration of the beneficial plant microorganism
Streptomyces nigrescens strain MR541. When applied, this unique microbe colonizes the plant’s roots and foliage, producing beneficial by products that aid in plant vigor, growth, and yield.
- EPA Registered
- OMRI Listed
- Lab Tested
Why Choose Colossus?
The Colossus microbe was discovered in an Idaho potato field during a
lengthy search for beneficial soil microbes in the Pacific Northwest. It stood
out among the thousands of isolates for its ability to colonize plants’ roots
as well as its production of a myriad of beneficial secondary metabolites.
Yield Maximization
Boosts crop production significantly through enhanced nutrient uptake pathways and improved metabolic efficiency.
Root Architecture
Promotes deeper, more complex root systems for better stability and access to deep-soil water reserves.
Stress Resilience
Fortifies plant cell walls against drought, heat, and environmental stressors, reducing crop loss.
- THE SCIENCE
Bio-Active Microbial Action
Colossus utilizes a proprietary strain of Streptomyces nigrescens (MR541) that actively colonizes both the rhizosphere and plant foliage. Once established, this microbe synthesizes enzymes like chitinase to enhance soil health, along with high levels of siderophores—compounds that unlock bound iron and essential metals to make them immediately available to the plant.
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Root & Foliar Colonization
Streptomyces nigrescens actively colonizes both the rhizosphere (roots) and foliage to drive plant vigor. -
Nutrient Availability (Siderophores)
Produces siderophores to unlock Iron and essential metals (Zinc, Boron, Manganese) that are typically bound in soil.
Supported Crops
Directions for Use
Foliar Application
Apply Colossus during the vegetative stage. Ensure thorough coverage of the leaf surface.
- Mix with 10-150 gallons of water per acre.
- Apply early morning or late evening to avoid rapid evaporation.
- Repeat application every 7-14 days as needed.
Soil Drench / In-Furrow
Ideal for root colonization at planting.
- Apply as an in-furrow spray at planting. Mount the spray nozzle so the spray is directed in the furrow directly on the seeds prior to coverage.
- Compatible with most liquid starter fertilizers.
- Rate: 1-3 oz per acre, depending on soil type.
Seed Treatment
Coat seeds prior to planting for immediate protection.
- Prior to planting, dissolve 1-6 oz. of Colossus in 1-4 oz of water per cwt of seed and spray directly on seeds.
- Ensure uniform coverage.
- Allow seeds to dry completely before bagging.
Want more info on Colossus?
Reach out anytime and we’ll send details and help you figure out the best fit for your crop.
Application Rates
| CROP TYPE | METHOD | RATE / ACRE |
| Corn & Soy | Foliar | 6-12 oz |
| Corn & Soy | In-Furrow | 1-3 oz |
| Wheat / Cereals | Top Dress | 3-12 oz |
| Vegetables | Drip Tape | 3-12 oz |
| Orchards | Root Drench | 3-12 oz |
