Growing Cashew Nuts in Kiambu

Soil suitability analysis based on Kiambu's nutrient profile

Kiambu County is a challenging environment for Cashew Nuts (soil-match score 0/100) and will need significant amendment before planting. Local soils average pH 5.28 — moderately acidic and inside the 5–7.5 band Cashew Nuts prefers, so no lime is usually required. Nitrogen (1.01 g/kg), phosphorus (13.7 mg/kg) and potassium (169 mg/kg) all meet Cashew Nuts's requirements, so a maintenance fertilizer programme is enough. Cashew Nuts prefers sandy soils, while Kiambu is largely clay, so drainage and organic-matter management matter more here. At 1700 m, the county sits above Cashew Nuts's preferred altitude ceiling of 700 m, where frost risk and cold nights reduce the crop's productivity. At current prices (about KES 275/kg) and a typical 900 kg/acre yield, a well-managed Cashew Nuts crop here can gross roughly KES 247,500 per acre.