Yam
Dioscorea alata
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Quick Info
water
Regular rainfall during growing, dry period for maturity
spacing
1 metre between plants
depth
15 cm deep (seed pieces)
sun
Full sun with staking for vine growth
season
Plant early wet season (Sept-Nov)
frost
Frost sensitive
height
2-3 m climbing vine (needs stakes)
gemination
N/A (grown from tuber pieces or bulbils)
sprout to harvest
8-10 months
soil ph
5.5-6.5
soil type
Deep, loose, well-drained fertile soil
fertilizer needs
Moderate, responds well to organic matter
About
Yam is a culturally significant staple root crop in PNG, deeply embedded in traditional agriculture and ceremonies. The greater yam (Dioscorea alata) is the most widely grown species. Yams are grown on stakes or trellises as climbing vines and produce large starchy tubers underground. They have excellent storage properties.
Health Benefits
Good source of complex carbohydrates, dietary fibre, potassium, manganese, and vitamin C. Lower glycaemic index than most root crops. Some varieties contain diosgenin used in traditional medicine.
Market Requirements
Tubers should be firm, heavy, and free of rot or insect damage. Large tubers (1-5 kg) are preferred. Undamaged skin is important for storage. Sell fresh or after short curing.