Pigeon Peas
Pigeon Peas Grading
How pigeon peas are assessed and graded commercially, and why a written specification and an approved sample do different jobs.
There is no single international grading standard for pigeon peas that all buyers work to. Unlike cereals, where national standards define numbered grades, pigeon peas are traded on contract specifications negotiated between the parties, supported where appearance matters by an approved sample. That means "grade" in this trade is shorthand for a bundle of agreed tolerances rather than a defined category, and two suppliers can use the same word to mean quite different things.
In practice, grading happens at three points. It happens at intake, when a delivery is sampled and either accepted for the intended contract, diverted to a lower specification or rejected. It happens on the cleaning line, where screens, aspiration, gravity tables and sorters physically separate the crop into an on-specification stream and a reject stream. And it happens at final check, when a composite sample is drawn from the finished lot and measured against the contract.
The parameters used in that assessment are consistent across the trade even though the tolerances are not: moisture, purity, foreign matter, admixture, damaged and discoloured grain, broken and split grain, insect damage and immature grain. What varies is where each tolerance is set and how strictly appearance is judged.
How a sample is assessed
A representative composite sample is drawn, reduced to a working sample, and weighed. Moisture is measured on an instrument. The working sample is then separated by hand into its components — sound grain, foreign matter, other colours, damaged, broken, insect damaged and immature — and each fraction is weighed and expressed as a percentage of the whole.
The arithmetic is straightforward; the judgement is not. What counts as "discoloured" rather than "sound", or "immature" rather than "small but filled", is exactly where two assessors disagree. This is why an approved sample matters: it converts a verbal standard into a physical reference that both parties can hold.
Size and grading
Pigeon peas are not normally traded on a size band in the way that mung beans or Kabuli chickpeas are. Screening is used to remove undersize and broken material rather than to produce calibrated grades. Where a buyer has a specific size requirement, it should be raised explicitly, because it changes the screening pass and the yield.
Common causes of disagreement
- Different interpretations of "discoloured" — the reason an approved sample is worth the time it takes to agree.
- Sampling method: a sample drawn from a few accessible bags is not representative of a lot.
- Moisture measured on different instruments, at different points, at different times.
- Condition on arrival after a long transit being assessed against a specification written for condition at loading.
- Colour type expectations that were never written down, only assumed.
Frequently asked questions
Is there an official grade standard for pigeon peas?
There is no single international standard applied across the trade. Pigeon peas are traded on negotiated contract specifications, supported by an approved sample where appearance matters. Some destination markets have their own reference standards, which should be confirmed with the buyer.
Why do you recommend an approved sample?
Because the parameters where disputes actually arise — discolouration, colour type, general appearance — are judgement calls that words describe poorly. A sealed, agreed sample held by both parties converts that judgement into a physical reference.
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