Growing Sweet Potato in Laikipia
Soil suitability analysis based on Laikipia's nutrient profile
Laikipia County is well suited to Sweet Potato, scoring 84/100 on ShambaIQ's soil-match model. Local soils average pH 4.99 — strongly acidic and inside the 4.5–7 band Sweet Potato prefers, so no lime is usually required. Nitrogen (1.42 g/kg), phosphorus (16.6 mg/kg) and potassium (215 mg/kg) all meet Sweet Potato's requirements, so a maintenance fertilizer programme is enough. The county's predominantly sandy loam soils suit Sweet Potato, which favours sandy loam. At current prices (about KES 18/kg) and a typical 3,500 kg/acre yield, a well-managed Sweet Potato crop here can gross roughly KES 63,000 per acre.
Suitability score
Soil match analysis
| Nutrient | Laikipia soil | Sweet Potato needs | Status |
|---|---|---|---|
| pH | 4.99 | 4.5–7 | OK |
| Nitrogen | 1.42 g/kg | min 0.5 g/kg | OK |
| Phosphorus | 16.6 mg/kg | min 12 mg/kg | OK |
| Potassium | 215 mg/kg | min 200 mg/kg | OK |
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
Top dressing guide
Product
None
Timing
None required
Instruction
Sweet potatoes rarely need top dressing. Excess N promotes vines over tubers.
Bags per Acre
0
Recommended 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.
Economics
Market priceKES 18/kg
Expected yield3,500 kg/acre
Estimated revenueKES 63,000/acre
Preferred textureSandy Loam
Fertilizer prices
DAP
KES 2,500(6,500)
CAN
KES 2,500(4,500)
NPK 17:17:17
KES 2,500(5,600)
Urea
KES 2,500(5,500)
Lime
KES 1,500(1,800)
Green = subsidized · (Commercial) per 50kg bag