Growing Bambara Nuts in Nyandarua

Soil suitability analysis based on Nyandarua's nutrient profile

Nyandarua County is a challenging environment for Bambara Nuts (soil-match score 36/100) and will need significant amendment before planting. Local soils average pH 5.38 — moderately acidic and inside the 5–6.5 band Bambara Nuts prefers, so no lime is usually required. Nitrogen (1.28 g/kg), phosphorus (14 mg/kg) and potassium (166 mg/kg) all meet Bambara Nuts's requirements, so a maintenance fertilizer programme is enough. Bambara Nuts prefers sandy soils, while Nyandarua is largely clay, so drainage and organic-matter management matter more here. At 2300 m, the county sits above Bambara Nuts's preferred altitude ceiling of 1600 m, where frost risk and cold nights reduce the crop's productivity. On ShambaIQ's soil-match model, Bambara Nuts is the #83 soil match of the 106 crops we assess for Nyandarua County. Bambara Nuts's full potential is about 400 kg/acre (~KES 60,000/acre at KES 150/kg), but at Nyandarua's 36/100 suitability a realistic target here is closer to 180 kg/acre (~KES 27,000/acre) unless the constraints above are addressed.

Better matched to Nyandarua's soil: Tea, Pyrethrum, and Potato — each scores higher on the same soil.