Black Gram

Black gram is grown mainly for its dry seed, which is used split, whole, or ground into flour and batter for staple foods across South Asia. Its short duration and adaptability allow it to be grown in the main season, in rice fallows, and as a catch crop.

The crop is often grown on residual soil moisture after rice, using its ability to establish and mature quickly on heavier soils that retain moisture into the dry season.

Family

Fabaceae (legume family)

Genus and species

Vigna mungo

Growth habit

Spreading, hairy annual herb bearing trifoliate leaves and short pods with small dark seeds

Root system

Taproot bearing nodules that host nitrogen-fixing rhizobia

Black gram is generally considered to have been domesticated in the Indian subcontinent, which remains the center of its production and consumption, with additional cultivation elsewhere in Asia.

Black gram is a warm-season crop requiring high temperatures and is sensitive to frost. Its short cycle allows it to be grown in the rainy season and in the cooler, drier post-rice period where residual moisture is available.

Excessive rainfall during pod maturity can cause seed weathering and favor disease, so drier conditions during ripening are preferred.

Black gram grows on a wide range of soils and is somewhat better suited than many pulses to heavier, moisture-retentive clay loams, a trait that supports its use in rice-fallow cropping. It nonetheless requires adequate drainage and is sensitive to prolonged waterlogging.

Black gram is direct-seeded, often broadcast into a standing or recently harvested rice crop to exploit residual moisture, or sown into a prepared seedbed in the main season. Weed control during early growth is important because the crop establishes slowly.

• Short-duration cultivar matched to the cropping window and season
• Sowing timed to make use of residual moisture in rice-fallow systems
• Timely weed management during slow early establishment
• Rhizobial inoculation in fields where effective nodulation is uncertain

Effective nodulation supplies much of the crop’s nitrogen requirement. Phosphorus is often limiting, and adequate early nutrient availability supports nodulation and pod set in this short-season crop.

Black gram is grown under both rain-fed and residual-moisture conditions, with supplemental irrigation used in some systems. Moisture during flowering and pod fill supports yield, while the crop remains intolerant of standing water.

In rice-fallow cropping, the crop relies largely on stored soil moisture, making cultivar duration and sowing timing important to match the drying profile of the soil.

Powdery mildew and anthracnose are common foliar diseases, and yellow mosaic virus, transmitted by whiteflies, is a major disease of black gram in South Asia. Root rots occur under wet, poorly drained conditions.

Whiteflies, aphids, thrips, and pod borers are important insect pests, and storage weevils damage dry seed. Management combines resistant cultivars, whitefly control to limit virus spread, monitoring, and, where warranted, locally authorized controls applied according to their labels.

Black gram is harvested once pods have matured and dried, typically by hand pulling or cutting in smallholder systems because of uneven maturity and a spreading habit. Dry weather during ripening reduces losses from seed weathering.

• Split and whole dry seed used in dhal and a wide range of staple dishes
• Ground seed used in batters and fermented foods across South Asia
• Residues and haulms fed to livestock as fodder
• Use as a short-season legume to improve soil fertility in rotations