Growing Sweet Potato in Marsabit
Soil suitability analysis based on Marsabit's nutrient profile
Generally not ideal — Marsabit is poorly suited to Sweet Potato. Marsabit's soil (pH 8.22, alkaline) gives Sweet Potato a suitability score of 13/100. Match fertilizer to Marsabit's nitrogen and phosphorus levels for the best result.
Marsabit County is a challenging environment for Sweet Potato (soil-match score 13/100) and will need significant amendment before planting. At an average pH of 8.22 the soil sits above Sweet Potato's preferred 4.5–7 range, which can limit uptake of phosphorus and micronutrients. Nitrogen (0.52 g/kg), phosphorus (37.3 mg/kg) and potassium (420 mg/kg) all meet Sweet Potato's requirements, so a maintenance fertilizer programme is enough. The county's predominantly sandy soils suit Sweet Potato, which favours sandy loam. Marsabit receives approximately 300 mm/year — well below Sweet Potato's minimum of 600 mm — so supplemental irrigation would be essential for this crop. On ShambaIQ's soil-match model, Sweet Potato is the #58 soil match of the 106 crops we assess for Marsabit County. Sweet Potato's full potential is about 5,000 kg/acre (~KES 90,000/acre at KES 18/kg), but at Marsabit's 13/100 suitability a realistic target here is closer to 813 kg/acre (~KES 14,634/acre) unless the constraints above are addressed.
Better matched to Marsabit's soil: Sisal, Chia, and Aloe Vera — each scores higher on the same soil.
Soil & climate match
| Factor | Marsabit soil | Sweet Potato needs | Status |
|---|---|---|---|
| pH | 8.22 | 4.5–7 | Adjust |
| Nitrogen | 0.52 g/kg | min 0.5 g/kg | OK |
| Phosphorus | 37.3 mg/kg | min 12 mg/kg | OK |
| Potassium | 420 mg/kg | min 200 mg/kg | OK |
| Rainfall | 300 mm | 600–1,800 mm | Low |
| Altitude | 1,100 m | 0–2,200 m | OK |
Planting calendar for Marsabit
Long Rains· March–May
Short Rains· October–DecemberMain season here
Dry Season· January–March
Top dressing guide
Marsabit's nitrogen reads 0.52 g/kg, but the rate stays at zero: Sweet Potato is not top-dressed, for the crop-specific reason above.
Seed varieties for Marsabit
Varieties suited to Marsabit's 1,100 m altitude and 300 mm annual rainfall — 1 of 5 sweet potato varieties we list.
Economics
Fertilizer prices
Green = subsidized · (Commercial) per 50kg bag