Reading a Horse Gram Lot: Visual Quality Markers Procurement Teams Should Know

When a horse gram sample lands on your desk, five markers tell you most of what you need to know before it goes anywhere near a lab: colour uniformity, broken seed percentage, foreign matter, moisture by feel, and visible insect damage. Check these in order and you will have a defensible go/no-go decision in under ten minutes.

What is horse gram — and why the name varies

Horse gram (Macrotyloma uniflorum) is traded under several names: Hurali in Kannada, Kollu in Tamil, Ulavalu in Telugu, Kulthi in Hindi. The seed varies by region. Karnataka horse gram is typically brown to dark brown with a dull sheen. Lots from other origins may be lighter or more variegated — establish the baseline for your origin before scoring colour uniformity. At KVM & Co., Mysore, the markers below reflect what we see arriving at APMC Yard, Bandipalya.

The five-step visual inspection checklist

1. Colour uniformity. Spread the sample on a white tray in good light. Karnataka horse gram should be predominantly dark brown to russet. Notably lighter seeds are likely immature; near-black or charcoal-grey seeds suggest over-storage or mould risk. We flag any lot where more than 5% of seeds fall outside the expected colour band for a moisture check before pricing.
2. Broken seed percentage. Weigh out 200 g. Separate every seed that is split or has lost more than one-quarter of its body, then weigh the broken fraction. Under 2% is premium; under 5% is acceptable for general dal mill processing. Above 5%, broken seeds attract insects faster in storage and yield less in milling — price accordingly.
3. Foreign matter. From the same 200 g spread, remove stones, soil clods, weed seeds, and husk fragments. Below 1% for premium lots; below 2% for standard trade — in line with FSSAI general standards for whole pulses. More than 4 g of stones and soil in your 200 g sample means the lot needs a destoning estimate before you agree a price.
4. Moisture by feel and bite. Press a pinch of seeds between thumb and forefinger — sound horse gram has no give. Bite one seed: it should crack cleanly with a sharp click. Any rubbery softness or easy crush means moisture is likely above 11%, the safe storage threshold per BIS IS 1813 for whole pulses. Seeds that flex instead of snap are a red flag.
5. Insect damage. Hold the sample to a light source. Look for small round exit holes — 1–2 mm — made by pulse beetle (Callosobruchus maculatus). Live infestation means reject. Old exit holes with no live insects may be considered for discounted procurement, but insist on a bag-by-bag check, not just the outer row.

Common defects defined

Weeviled seeds

Seeds with exit holes from pulse beetle. The larva consumes the interior before emerging, leaving a hollowed shell. Even old weeviling reduces dal yield and can mask an active infestation.

Discoloured seeds

Seeds outside the expected colour range — too light (immature, chalky) or too dark (over-stored, mould-affected). Distinct from normal lot-to-lot variation.

Immature seeds

Harvested before full development. Typically lighter, lower in test weight, and prone to poor milling recovery.

Foreign matter

Any non-seed material: stones, soil, weed seeds, husk, chaff. Measured as a percentage by weight of the sample.

Broken seeds

Seeds split or missing more than a quarter of their body. They absorb moisture faster, attract insects sooner, and yield less usable dal.

What visual inspection cannot tell you

Visual inspection is a rapid triage tool, not a substitute for laboratory analysis. It will not give you actual moisture percentage — use a calibrated grain moisture meter. It cannot detect pesticide residues or mycotoxin contamination; both require an accredited lab. For export consignments, aflatoxin and residue testing is a prerequisite, not an option. The visual check gets you to a confident go/no-go in minutes. The lab confirms what you cannot see.

For grading specifications, the Agmarknet portal publishes standards for notified pulses, and ICAR’s Indian Institute of Pulses Research maintains research on storage and quality parameters for horse gram and other minor pulses.