Classification
Product TypeProcessed Food
Product FormDried
Industry PositionProcessed Agricultural Product
Market
Dried yam is a shelf-stable processed tuber product traded as chips/slices and as flour made from dried chips, typically produced to extend availability beyond the seasonal harvest and to reduce losses from the high moisture content of fresh yam. Global yam production is highly concentrated in West Africa’s “yam zone,” with Nigeria, Ghana, Côte d’Ivoire, Benin, and Togo among the most important producing countries. In trade classification terms, yams (Dioscorea spp.) are covered under HS 071430, which includes yams that are fresh, chilled, frozen, or dried. For dried yam products, quality and marketability are strongly influenced by drying effectiveness and storage hygiene, because moisture re-absorption and mold growth can create food-safety and rejection risks.
Major Producing Countries- 나이지리아Core producer in the West African yam zone; global production is heavily concentrated in this zone per FAO/IITA summaries.
- 가나Major producer within the West African yam zone.
- 코트디부아르Major producer within the West African yam zone.
- 베냉Important producer and processor of dried yam chips/flour in West Africa.
- 토고Major producer within the West African yam zone.
- 카메룬Included in IITA-described West African yam zone production geography.
Supply Calendar- West African yam zone (example: southeastern Nigeria):Dec, JanFAO post-harvest guidance notes that yams for long-term storage are often harvested during the harmattan period (Dec–Jan) in parts of southeastern Nigeria; more broadly, mature yams are harvested at the end of the rainy season or early dry season in many West African areas.
Specification
Major VarietiesDioscorea rotundata (white Guinea yam), Dioscorea alata (water yam), Dioscorea cayenensis (yellow yam)
Physical Attributes- Chip/slice color (cream/white to yellow) and uniformity are key buyer-visible attributes; darkening can indicate oxidation or quality deterioration.
- Low moisture, absence of visible mold, and low foreign matter are critical for shelf-stable dried yam acceptance.
Compositional Metrics- Moisture control is a primary commercial parameter; moisture levels above ~15% are favorable for mold growth in dried yam chips in storage-chain observations.
- Aflatoxin contamination has been documented in dried yam chips in Benin supply chains, with a share of tested samples exceeding a cited Codex total-aflatoxin reference value (15 µg/kg) in one published survey.
Grades- No dedicated international export standard for yam is cited in FAO post-harvest guidance; contracts typically rely on buyer specifications (moisture, cleanliness, defect/mold limits, chip size).
Packaging- Moisture-barrier packaging (e.g., lined bags or laminated pouches) is important to prevent rehydration and quality loss during distribution.
- For bulk trade, sealed inner liners plus outer sacks/cartons are commonly used to reduce moisture ingress and insect contamination risk.
ProcessingDried chips/slices can be milled into flour; processing yield and color are sensitive to slicing thickness, drying method, and re-wetting during storage.
Supply Chain
Value Chain- Raw yam selection/receiving -> washing -> peeling -> slicing/chipping -> drying (sun/solar/mechanical) -> cooling -> sorting -> (optional milling to flour) -> packaging -> storage/distribution
Demand Drivers- Processing into dried chips and flour extends yam availability beyond the harvest season and reduces losses linked to fresh yam perishability.
Temperature- Ambient storage is typical, but maintaining dry, well-ventilated conditions is essential; moisture uptake during humid storage increases mold and toxin risk.
Risks
Food Safety HighInadequate drying and humid storage can allow mold growth and aflatoxin contamination in dried yam chips; published supply-chain surveys in West Africa have reported aflatoxin presence and a material share of samples exceeding a cited Codex total-aflatoxin reference value, creating health risks and potential import rejections.Implement hygienic drying to stable low moisture, prevent re-wetting via moisture-barrier packaging, apply HACCP/GMP controls, and verify with routine mycotoxin and moisture testing.
Storage Pests MediumInsect infestation during storage of dried yam chips has been documented, and pest damage can accelerate quality loss and increase contamination risk.Use sealed, insect-resistant packaging and storage hygiene, apply integrated pest management in warehouses, and rotate stock to reduce long storage exposure.
Plant Disease MediumYam anthracnose is reported as a highly damaging disease in major yam-producing regions (including West Africa), with severe yield-loss potential that can tighten raw-yam availability for processors during outbreak years.Support sourcing from areas using tolerant varieties and disease management, and diversify origins where feasible to reduce single-region exposure.
Sustainability- Postharvest loss and waste reduction through improved drying and storage systems for yam-derived dried products.
FAQ
What is the single biggest global trade risk for dried yam products?Food-safety non-compliance driven by mold and aflatoxin contamination is the most critical risk, because inadequate drying and humid storage can lead to aflatoxin presence at levels that create health concerns and potential import rejections; published surveys of dried yam chips in West Africa report aflatoxin contamination issues.
Where is global yam production most concentrated?Global yam production is heavily concentrated in West Africa’s “yam zone,” with Nigeria, Ghana, Côte d’Ivoire, Benin, and Togo among the key producing countries cited in FAO- and IITA-referenced summaries.
How is yam classified for international trade when sold dried?Under the Harmonized System, yams (Dioscorea spp.) are covered in HS heading 0714, with a specific 6-digit line 071430 for yams that can be traded fresh, chilled, frozen, or dried.