Growing Sweet Potato in Kitui
Soil suitability analysis based on Kitui's nutrient profile
Possible but challenging — Kitui is only marginally suited to Sweet Potato. Kitui's soil (pH 7.03, near-neutral) gives Sweet Potato a suitability score of 49/100. Match fertilizer to Kitui's nitrogen and phosphorus levels for the best result.
Sweet Potato can be grown in Kitui County, but the soil scores 49/100 and needs targeted management to reach full potential. At an average pH of 7.03 the soil sits above Sweet Potato's preferred 4.5–7 range, which can limit uptake of phosphorus and micronutrients. Nitrogen (0.74 g/kg), phosphorus (30.5 mg/kg) and potassium (339 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 #57 soil match of the 106 crops we assess for Kitui County. Sweet Potato's full potential is about 5,000 kg/acre (~KES 90,000/acre at KES 18/kg), but at Kitui's 49/100 suitability a realistic target here is closer to 3,063 kg/acre (~KES 55,134/acre) unless the constraints above are addressed.
Better matched to Kitui's soil: Mango, Sisal, and Moringa — each scores higher on the same soil.
Soil & climate match
| Factor | Kitui soil | Sweet Potato needs | Status |
|---|---|---|---|
| pH | 7.03 | 4.5–7 | Adjust |
| Nitrogen | 0.74 g/kg | min 0.5 g/kg | OK |
| Phosphorus | 30.5 mg/kg | min 12 mg/kg | OK |
| Potassium | 339 mg/kg | min 200 mg/kg | OK |
| Rainfall | 500 mm | 600–1,800 mm | Low |
| Altitude | 900 m | 0–2,200 m | OK |
Planting calendar for Kitui
Long Rains· March–May
Short Rains· October–DecemberMain season here
Dry Season· January–March
Top dressing guide
Kitui's nitrogen reads 0.74 g/kg, but the rate stays at zero: Sweet Potato is not top-dressed, for the crop-specific reason above.
Seed varieties for Kitui
Varieties suited to Kitui's 900 m altitude and 500 mm annual rainfall — 1 of 5 sweet potato varieties we list.
Economics
Fertilizer prices
Green = subsidized · (Commercial) per 50kg bag