Sweet Potato farming guide — Kenya

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

Interested in starting or scaling sweet potato farming in Kenya? This comprehensive guide maps out the optimal soil requirements (such as target pH ranges), the most suitable counties for growing sweet potato, 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
4.5–7
Nitrogen
low
Phosphorus
medium
Potassium
high
Preferred texture: Sandy Loam

Optimizing soil and fertilizers for Sweet Potato in Kenya

To achieve maximum yields when farming sweet potato in Kenya, managing soil suitability is crucial. This crop performs best within a soil pH range of 4.5 to 7. 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. Sweet Potato has a low 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 None at None required), ensures high crop quality and protects your overall farm investment.

Best counties for Sweet Potato

Challenging counties for Sweet Potato

These counties may need soil amendments for Sweet Potato

Certified seed varieties

KabodeMedium/Dryland
CIP/KALRO · 120-150 days · 3–4 tons/acre
Orange-fleshed; high Vitamin A; drought tolerant.
Kenspot 5Medium/Highland
KALRO · 90-120 days · 4–5 tons/acre
Purple-skinned; excellent taste; good market demand.
VitamuMedium/Highland
KALRO · 120-150 days · 3.5–4.5 tons/acre
Orange-fleshed; dual purpose grain and fodder; KEPHIS certified; 1200-1800m; released 2015.
Kenspot-1Highland
KARI Njoro · 120-150 days · 3.5–4.5 tons/acre
Orange-fleshed; high beta-carotene; suited to 1700-2300m; released 2013.
Kenspot-3Highland
KARI Njoro · 120-150 days · 4–5 tons/acre
White-fleshed; high dry matter; good storability; 1900-2300m cold highland adapted; released 2013.

Planting calendar

Long Rains

Month 1
Vine Cutting Planting & Basal Fertilizer
Month 2
Weeding & Vine Management
Month 3
Harvesting & Storage

Short Rains

Month 1
Vine Planting & Basal Fertilizer
Month 2
Vine Trailing & Weeding
Month 3
Harvesting

Dry Season

Month 1
Irrigation & Vine Planting
Month 2
Weeding
Month 3
Harvesting & Vine Multiplication

Economics

Market priceKES 18/kg
Expected yield3,500 kg/acre

Est. revenueKES 63,000/acre

Top dressing

Product: None
Timing: None required
Bags/acre: 0

Sweet potatoes rarely need top dressing. Excess N promotes vines over tubers.

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 Sweet Potato