Orvan™ strengthens the legume–rhizobia system.

Orvan™ — Rhizosphere coordination consortium. Amplified nodulation. More nitrogen fixed. Higher yield.

A three-strain rhizosphere consortium, applied alongside your rhizobial inoculant, that strengthens nodulation and nitrogen fixation for better stands and higher yield across eight legumes. In peanut, the same shift in the root-zone microbiome is the focus of our peer-reviewed coupling research — where it is also associated with markedly lower soil A. flavus, the fungus that produces aflatoxin.

How it works

The strains reshape the rhizosphere to improve the nodulation environment for native or co-applied rhizobia, while stronger crop vigor sustains nitrogen fixation through pod fill. In peanut, our research also examines the aflatoxin side of the coupling — how the same shift in the root-zone microbiome relates to Aspergillus flavus, the fungus that produces aflatoxin — in peer-reviewed studies and multi-season OCRI-CAAS field trials.

Where it fits

Orvan™ is a rhizosphere-coordination consortium, not a rhizobial inoculant. It carries no Rhizobium of its own, and no fungus either — all three strains are bacteria. Applied alongside (or on top of) your rhizobial inoculant, it amplifies the native and co-applied rhizobia already adapted to your soil. Fully complementary to existing programs. Non-GMO; all three strains spore-forming.

Strains

Bacillus velezensis · Brevibacillus laterosporus · Paenibacillus mucilaginosus.

Field-proven

• Field-proven across all eight legumes: peanut (405 sites / 19 prov · +19.9%), soybean (253 / 18 · +16.1%), common bean (62 / 6 · +14.2%), cowpea (48 / 5 · +13.8%), pigeon pea (36 / 4 · +12.6%), mung bean (54 / 5 · +15.3%), black gram (30 / 4 · +11.9%), alfalfa (96 / 4 · +15.2%), each via its locally-adapted rhizobia.
• On peanut and soybean, in OCRI-CAAS trials: peanut +19.9% yield with >80% less soil A. flavus; soybean +16.1% with elevated isoflavone; nodules up to 8.5× / 3.7×; nitrogenase up to 10.7× / 4.8× — the higher peanut fold-changes occur where native rhizobia are scarce; multi-site demonstration averages are lower.
• In dedicated trials over three consecutive years, Orvan™-treated fields held a >10% yield gain even with 20–40% less synthetic nitrogen.

Formulations

• Orvan™ Base — Granule, 2–4 mm; ≥ 5×10⁸ CFU/g; 30–60 kg/ha; Broadcast or banded with base fertilizer
• Orvan™ Coat — Liquid seed coating concentrate; ≥ 5×10⁹ CFU/mL; 2.5 mL/kg seed; On seed, by hand or through a coater
• Orvan™ Root — Water-soluble powder; Guaranteed under NDA; 30–60 kg/ha; Dissolved, in-furrow at sowing

Orvan™ Coat — water added at treatment

The product rate does not move: 25 mL treats 10 kg of seed and 250 mL treats 100 kg, whichever row you are on. Only the water changes, and only to carry that fixed dose evenly over the seed without over-wetting it. Where a chemical seed treatment is used, apply it first, let the seed dry, then apply Orvan™ Coat undiluted as the final layer.

Tank-mix compatibility — seed-applied formulations

This list covers the formulation that goes onto seed, Orvan™ Coat. It is co-formulation testing, not inference from mode of action. It does not extend to Nodu™ or Vigor™, which carry different organisms, and it does not apply to Orvan™ Base or Orvan™ Root — see the note at the end.

Cleared for co-application

Not compatible

The pattern behind the two lists is straightforward. Nearly every fungicide used in seed treatment acts on fungi and has little activity against bacteria, so it can be co-applied. Products registered against bacterial disease — canker, wilt, soft rot, bacterial spot — are aimed at the same class of organism as the inoculant, and cannot. Two further points on copper: it should not be combined with strong acids or phosphate fertilisers, and an over-concentrated seed coating suppresses germination irrespective of the biology. Note also that this list names active ingredients. A commercial product also contains solvents, surfactants and, in many liquid formulations, an in-can preservative, none of which are covered here; where a specific product matters, test it.

Orvan™ Base and Orvan™ Root are placed in the soil and never contact a treated seed coat, so seed-treatment compatibility does not apply to them. Their compatibility question is a different one: what they are blended with. Urea hydrolyses to ammonia and lifts pH in the immediate surroundings; high-salt fertilisers such as potassium chloride and ammonium phosphates impose osmotic stress; superphosphate carries free acidity. None of this is prohibitive, but contact time is the exposure, so blend immediately before application rather than storing a prepared blend. Where a seed treatment is heavy enough to be a concern, moving the biology into the furrow removes the question rather than managing it.

How to use

At sowing, matched to how the product reaches the crop: Base 30–60 kg/ha broadcast or banded with base fertilizer · Root 30–60 kg/ha dissolved in clean water and applied in-furrow through the planter · Coat 2.5 mL/kg seed on the seed, by hand or through a coater. The dose does not change by crop. A live-culture product: with a fungicide seed treatment apply that first, let the seed dry, then Orvan™; apply any rhizobial inoculant after Orvan™. Avoid copper fungicides, agricultural antibiotics, strong alkali (pH > 9) and chlorinated water (> 2 ppm). Blend with fertilizer immediately before application rather than storing a prepared blend. Storage differs by format: the dry formats keep at or below 30 °C with no cold chain and are used within 30 days of opening; Coat is held at 5–25 °C, must not freeze, and is used within 14 days of opening.

Registered technical indicator: total effective viable count ≥ 5×10⁸ CFU/g (Orvan™ Base granule). Viable count guaranteed to expiry; all three strains spore-forming, for heat and desiccation tolerance and no cold chain on the dry formats. Non-GMO, BSL-1.