Yams farming guide — Kenya

Soil requirements, top counties, seed varieties, fertilizer plan & economics

Interested in starting or scaling yams farming in Kenya? This comprehensive guide maps out the optimal soil requirements (such as target pH ranges), the most suitable counties for growing yams, certified seed varieties, seasonal fertilizer guidelines, and a detailed per-acre production budget to set you up for a successful harvest.

Soil requirements

pH range
5.5–6.5
Nitrogen
medium
Phosphorus
medium
Potassium
high
Preferred texture: Sandy Loam

Optimizing soil and fertilizers for Yams in Kenya

To achieve maximum yields when farming yams in Kenya, managing soil suitability is crucial. This crop performs best within a soil pH range of 5.5 to 6.5. Soils that fall outside this range can lock out essential macro and micro-nutrients, leading to stunted growth or crop failure. For acidic soils, applying dolomitic or calcitic agricultural lime is recommended at least 30 days before planting to normalize acidity.

Fertilizer application should be calibrated based on the crop’s nutrient demands. Yams has a medium nitrogen requirement, medium phosphorus requirement, and high potassium demand. Using certified seed varieties suited for your specific altitude and rainfall pattern, combined with a precise basal and top-dressing program (such as applying a balanced NPK compound), ensures high crop quality and protects your overall farm investment.

Best counties for Yams

Challenging counties for Yams

These counties may need soil amendments for Yams

Certified seed varieties

Local White (Nyandarua/Meru)Medium/Highland 1000-1800m
Local · 240-300 days · 2.5–3.5 tons/acre
Traditional tuber crop; highly valued for food security; propagated via tuber sets.
Local PurpleMedium/Highland 1000-1800m
Local · 270-330 days · 2–3 tons/acre
Vigorous climbing vine; highly nutritious tuber.

Economics

Market priceKES 80/kg
Expected yield6,000 kg/acre

Est. revenueKES 480,000/acre

Fertilizer prices

DAPKES 2,500
CANKES 2,500
NPK 17:17:17KES 2,500
UreaKES 2,500
LimeKES 1,500

Subsidized price / 50kg bag

Check your county for Yams