Growing Potato in Tharaka Nithi
Soil suitability analysis based on Tharaka Nithi's nutrient profile
Possible but challenging — Tharaka Nithi is only marginally suited to Potato. Tharaka Nithi's soil (pH 4.99, strongly acidic) gives Potato a suitability score of 45/100. Apply agricultural lime before planting to unlock phosphorus and lift the score.
Potato can be grown in Tharaka Nithi County, but the soil scores 45/100 and needs targeted management to reach full potential. Local soils average pH 4.99 — strongly acidic and inside the 4.8–6.5 band Potato prefers, so no lime is usually required. The main gap is phosphorus — measured at N 1.23 g/kg, P 19.6 mg/kg, K 211 mg/kg against this crop's high/high/high demand — so the fertilizer plan below prioritises closing that deficit. The county's predominantly sandy loam soils suit Potato, which favours sandy loam. On ShambaIQ's soil-match model, Potato is the #86 soil match of the 106 crops we assess for Tharaka Nithi County. Potato's full potential is about 8,000 kg/acre (~KES 304,000/acre at KES 38/kg), but at Tharaka Nithi's 45/100 suitability a realistic target here is closer to 4,500 kg/acre (~KES 171,000/acre) unless the constraints above are addressed.
Better matched to Tharaka Nithi's soil: Avocado, Macadamia, and Cassava — each scores higher on the same soil.
Soil & climate match
| Factor | Tharaka Nithi soil | Potato needs | Status |
|---|---|---|---|
| pH | 4.99 | 4.8–6.5 | OK |
| Nitrogen | 1.23 g/kg | min 1.2 g/kg | OK |
| Phosphorus | 19.6 mg/kg | min 20 mg/kg | Low |
| Potassium | 211 mg/kg | min 200 mg/kg | OK |
| Rainfall | 900 mm | 700–1,500 mm | OK |
| Altitude | 1,100 m | 1,500–3,000 m | Low |
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 (1.23 g/kg) already meets Potato's 1.2 g/kg requirement, so this is a maintenance rate.
Seed varieties for Tharaka Nithi
Varieties suited to Tharaka Nithi's 1,100 m altitude and 900 mm annual rainfall — 1 of 14 potato varieties we list.
Economics
Fertilizer prices
Green = subsidized · (Commercial) per 50kg bag