Growing Napier Grass in Kirinyaga

Soil suitability analysis based on Kirinyaga's nutrient profile

Kirinyaga County is well suited to Napier Grass, scoring 75/100 on ShambaIQ's soil-match model. Local soils average pH 5.31 — moderately acidic and inside the 5–8 band Napier Grass prefers, so no lime is usually required. Nitrogen (1.36 g/kg), phosphorus (12.5 mg/kg) and potassium (177 mg/kg) all meet Napier Grass's requirements, so a maintenance fertilizer programme is enough. Napier Grass prefers loam soils, while Kirinyaga is largely clay, so drainage and organic-matter management matter more here. At current prices (about KES 5/kg) and a typical 15,000 kg/acre yield, a well-managed Napier Grass crop here can gross roughly KES 75,000 per acre.