Dioscorea rotundata / D. alata
Sunlight
Full sun — vines climb stakes to access maximum light
Water
1,000-1,800 mm per crop, well distributed over the 8-10 month growing season.
Soil
Deep, fertile, well-drained loam. pH 5.5-7.0. Yam requires loose soil for tuber expansion.
Temperature
Optimal 25-30°C. Requires warm consistent temperatures.
Humidity
Moderate to high during vine growth. Dry period triggers tuber dormancy.
Season
Long season — 8-10 months. Plant at beginning of rainy season, harvest during dry season.
Updated February 2026
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Overview
Yam is the most important tuber crop in West Africa, where it is deeply embedded in culture, cuisine, and economy. Nigeria produces 70% of the world's yam (65+ million tonnes). Two main species are cultivated: white yam (D. rotundata, preferred for pounded yam) and water yam (D. alata, higher yield potential). Yam tubers can weigh 5-20 kg and are rich in carbohydrates, vitamin C, and potassium. The 'New Yam Festival' celebrated across West Africa marks the harvest season. Yam is the most expensive staple food in Africa due to high labor requirements for planting, staking, and harvesting.
Plant Health
Yam is susceptible to 1 known diseases. Early detection is critical — use the CuraPlant app to scan leaves and get an instant AI diagnosis.
Cultivation Guide
Cut seed tubers to 200-300 g pieces, cure 3-5 days before planting
Plant on mounds or ridges 1 × 1 m apart for white yam
Stake plants 2-3 months after emergence — essential for D. alata especially
Apply organic manure (5-10 t/ha) at planting — yam responds well to organic matter
Harvest first (milking harvest) at 6 months for fresh consumption, final harvest at 8-10 months for storage
Store tubers in ventilated barns (traditional) or apply wood ash to cut surfaces
Companion Planting
Strategic companion planting reduces pest pressure, improves pollination, and can significantly increase yields.
Climate & Regions
Active climate zones for Yam are highlighted below.
Tropical
Not typical
Subtropical
Not typical
Temperate
Not typical
Mediterranean
Not typical
Highland
Not typical
Arid / Semi-arid
Not typical
Specific Zones & Regions
Common Questions
Yam grows best during the long season — 8-10 months. plant at beginning of rainy season, harvest during dry season.. It requires optimal 25-30°c. requires warm consistent temperatures. and full sun — vines climb stakes to access maximum light. In tropical regions with consistent warmth, it can often be grown year-round with proper irrigation.
Yam is commonly affected by Yam Anthracnose. Regular crop monitoring, good air circulation, avoiding overhead irrigation, and using disease-resistant varieties are the most effective prevention strategies.
Yam grows best in deep, fertile, well-drained loam. ph 5.5-7.0. yam requires loose soil for tuber expansion.. For irrigation: 1,000-1,800 mm per crop, well distributed over the 8-10 month growing season.. Maintaining proper soil moisture without waterlogging is critical — Yam is sensitive to both drought stress and root rot from excess water.
Yam grows well alongside maize, melon. These companions help repel pests, improve pollination, or provide ground cover.
CuraPlant
Scan any leaf with your phone and get an instant AI diagnosis, treatment guide, and prevention plan — even offline.
