Growing Mango in Kirinyaga

Soil suitability analysis based on Kirinyaga's nutrient profile

Kirinyaga County is a challenging environment for Mango (soil-match score 40/100) and will need significant amendment before planting. At an average pH of 5.31 the soil is moderately acidic, below Mango's preferred 5.5–8.5 range; agricultural lime will lift pH and unlock phosphorus the crop cannot otherwise access. Nitrogen (1.36 g/kg), phosphorus (12.5 mg/kg) and potassium (177 mg/kg) all meet Mango's requirements, so a maintenance fertilizer programme is enough. Mango prefers sandy soils, while Kirinyaga is largely clay, so drainage and organic-matter management matter more here. At 1500 m, the county sits above Mango's preferred altitude ceiling of 1200 m, where frost risk and cold nights reduce the crop's productivity. Mango's full potential is about 8,000 kg/acre (~KES 80,000/acre at KES 10/kg), but at Kirinyaga's 40/100 suitability a realistic target here is closer to 4,000 kg/acre (~KES 40,000/acre) unless the constraints above are addressed.