Huasheng Biosciences

Black Gram inoculant program (Vigna mungo)

A major pulse across India and South Asia, central to food supply and to the soil-fertility phase of cereal rotations.

The challenge

Usually grown in low-input, intercropped systems on depleted soils, where sparse native rhizobia limit nodulation and the nitrogen it returns to the rotation.

55 kg N/ha — the nitrogen black gram can fix into a depleted rotation — held back where native rhizobia are too sparse to nodulate it well.

A staple that also feeds the soil

A major pulse across South Asia, black gram is both food on the plate and the fertility-building phase of the cereal rotations it sits within.

Grown on tired ground

It is usually raised low-input and intercropped on depleted soils, where sparse native rhizobia limit how well it can nodulate in the first place.

Thin nodulation, thin return

Weak fixation caps both the crop itself and the nitrogen it hands to the following cereal — so a struggling rotation loses on both counts.

The program

  • Nodu™ BG — establishes a reliable Bradyrhizobium symbiosis
  • Vigor™ — supports roots and resilience in intercropping
  • Orvan™ — couples that fixation with biocontrol

Field-proven

Across 30 sites in 4 provinces (Yunnan, Guangxi, Hainan; 2022–2024): +11.9% average yield, up to 4.3× more nodules, 38–41 nodules per plant, and up to 55 kg N/ha fixed, strengthening the pulse phase of cereal rotations.

Rhizobial fit

Black gram shares the cowpea-miscellany Bradyrhizobium group with cowpea and mung bean. Nodu™ BG is matched to local Bradyrhizobium for the low-input, intercropped systems where it is grown; Orvan™ amplifies native populations.

By product

  • Orvan™ (Orvan™ Blackgram): +11.9% yield, up to 4.3× more nodules (38–41/plant); 30 sites / 4 provinces. Nitrogen-fixation potentiation.
  • Nodu™ (Nodu™ BG, Bradyrhizobium (Vigna group)): +8.3% · 16 sites; Up to 55 kg N/ha, strengthens the rotation’s pulse phase.
  • Vigor™ (PGPR): +8.2% · 16 sites.

How to use

At sowing: Nodu™ BG 3–5 g/kg seed; Orvan™ Seed/Coat; fits intercropped and low-input systems.