Growing Sweet Potato in Kisii
Soil suitability analysis based on Kisii's nutrient profile
Yes — Kisii is well suited to Sweet Potato. Kisii's soil (pH 5.21, strongly acidic) gives Sweet Potato a suitability score of 86/100. Apply agricultural lime before planting to unlock phosphorus and lift the score.
Kisii County is well suited to Sweet Potato, scoring 86/100 on ShambaIQ's soil-match model. Local soils average pH 5.21 — moderately acidic and inside the 4.5–7 band Sweet Potato prefers, so no lime is usually required. The main gap is potassium — measured at N 1.09 g/kg, P 13.1 mg/kg, K 151 mg/kg against this crop's low/medium/high demand — so the fertilizer plan below prioritises closing that deficit. Sweet Potato prefers sandy loam soils, while Kisii is largely clay loam, so drainage and organic-matter management matter more here. On ShambaIQ's soil-match model, Sweet Potato is the #6 soil match of the 106 crops we assess for Kisii 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 | Kisii soil | Sweet Potato needs | Status |
|---|---|---|---|
| pH | 5.21 | 4.5–7 | OK |
| Nitrogen | 1.09 g/kg | min 0.5 g/kg | OK |
| Phosphorus | 13.1 mg/kg | min 12 mg/kg | OK |
| Potassium | 151 mg/kg | min 200 mg/kg | Low |
| Rainfall | 1,500 mm | 600–1,800 mm | OK |
| Altitude | 1,700 m | 0–2,200 m | OK |
Planting calendar for Kisii
Long Rains· March–MayMain season here
Short Rains· August–October
Dry Season· January–March
Top dressing guide
Kisii's nitrogen reads 1.09 g/kg, but the rate stays at zero: Sweet Potato is not top-dressed, for the crop-specific reason above.
Seed varieties for Kisii
5 sweet potato varieties are rated for Kisii's altitude (1,700 m) and rainfall (1,500 mm):
Economics
Fertilizer prices
Green = subsidized · (Commercial) per 50kg bag