Growing Sweet Potato in Tharaka Nithi
Soil suitability analysis based on Tharaka Nithi's nutrient profile
Yes — Tharaka Nithi is well suited to Sweet Potato. Tharaka Nithi's soil (pH 4.99, strongly acidic) gives Sweet Potato a suitability score of 84/100. Apply agricultural lime before planting to unlock phosphorus and lift the score.
Tharaka Nithi 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 (1.23 g/kg), phosphorus (19.6 mg/kg) and potassium (211 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. On ShambaIQ's soil-match model, Sweet Potato is the #4 soil match of the 106 crops we assess for Tharaka Nithi County. At current prices (about KES 18/kg) and a typical 5,000 kg/acre yield, a well-managed Sweet Potato crop here can gross roughly KES 90,000 per acre.
Soil & climate match
| Factor | Tharaka Nithi soil | Sweet Potato needs | Status |
|---|---|---|---|
| pH | 4.99 | 4.5–7 | OK |
| Nitrogen | 1.23 g/kg | min 0.5 g/kg | OK |
| Phosphorus | 19.6 mg/kg | min 12 mg/kg | OK |
| Potassium | 211 mg/kg | min 200 mg/kg | OK |
| Rainfall | 900 mm | 600–1,800 mm | OK |
| Altitude | 1,100 m | 0–2,200 m | OK |
Planting calendar for Tharaka Nithi
Long Rains· March–MayMain season here
Short Rains· October–December
Dry Season· January–March
Top dressing guide
Tharaka Nithi's nitrogen reads 1.23 g/kg, but the rate stays at zero: Sweet Potato is not top-dressed, for the crop-specific reason above.
Seed varieties for Tharaka Nithi
Varieties suited to Tharaka Nithi's 1,100 m altitude and 900 mm annual rainfall — 1 of 5 sweet potato varieties we list.
Economics
Fertilizer prices
Green = subsidized · (Commercial) per 50kg bag