Growing Sweet Potato in Tana River
Soil suitability analysis based on Tana River's nutrient profile
Generally not ideal — Tana River is poorly suited to Sweet Potato. Tana River's soil (pH 6.4, slightly acidic) gives Sweet Potato a suitability score of 34/100. Match fertilizer to Tana River's nitrogen and phosphorus levels for the best result.
Tana River County is a challenging environment for Sweet Potato (soil-match score 34/100) and will need significant amendment before planting. Local soils average pH 6.4 — slightly acidic to near-neutral and inside the 4.5–7 band Sweet Potato prefers, so no lime is usually required. The main gap is phosphorus and potassium — measured at N 1.04 g/kg, P 8.5 mg/kg, K 108 mg/kg against this crop's low/medium/high demand — so the fertilizer plan below prioritises closing those deficits. The county's predominantly sandy soils suit Sweet Potato, which favours sandy loam. Tana River receives approximately 400 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 #43 soil match of the 106 crops we assess for Tana River County. Sweet Potato's full potential is about 5,000 kg/acre (~KES 90,000/acre at KES 18/kg), but at Tana River's 34/100 suitability a realistic target here is closer to 2,125 kg/acre (~KES 38,250/acre) unless the constraints above are addressed.
Better matched to Tana River's soil: Sorghum, Cowpeas, and Pigeon Peas — each scores higher on the same soil.
Soil & climate match
| Factor | Tana River soil | Sweet Potato needs | Status |
|---|---|---|---|
| pH | 6.4 | 4.5–7 | OK |
| Nitrogen | 1.04 g/kg | min 0.5 g/kg | OK |
| Phosphorus | 8.5 mg/kg | min 12 mg/kg | Low |
| Potassium | 108 mg/kg | min 200 mg/kg | Low |
| Rainfall | 400 mm | 600–1,800 mm | Low |
| Altitude | 200 m | 0–2,200 m | OK |
Planting calendar for Tana River
Long Rains· March–May
Short Rains· October–DecemberMain season here
Dry Season· January–March
Top dressing guide
Tana River's nitrogen reads 1.04 g/kg, but the rate stays at zero: Sweet Potato is not top-dressed, for the crop-specific reason above.
Seed varieties for Tana River
Varieties suited to Tana River's 200 m altitude and 400 mm annual rainfall — 1 of 5 sweet potato varieties we list.
Economics
Fertilizer prices
Green = subsidized · (Commercial) per 50kg bag