Growing Pawpaw in Kirinyaga

Soil suitability analysis based on Kirinyaga's nutrient profile

Kirinyaga County is a challenging environment for Pawpaw (soil-match score 43/100) and will need significant amendment before planting. At an average pH of 5.31 the soil is moderately acidic, below Pawpaw's preferred 6–7.5 range; agricultural lime will lift pH and unlock phosphorus the crop cannot otherwise access. The main gap is potassium — measured at N 1.36 g/kg, P 12.5 mg/kg, K 177 mg/kg against this crop's high/medium/high demand — so the fertilizer plan below prioritises closing that deficit. Pawpaw prefers sandy loam soils, while Kirinyaga is largely clay, so drainage and organic-matter management matter more here. At 1500 m, the county sits above Pawpaw's preferred altitude ceiling of 1200 m, where frost risk and cold nights reduce the crop's productivity. Pawpaw's full potential is about 12,000 kg/acre (~KES 336,000/acre at KES 28/kg), but at Kirinyaga's 43/100 suitability a realistic target here is closer to 6,450 kg/acre (~KES 180,600/acre) unless the constraints above are addressed.