Growing Cowpeas in Kirinyaga

Soil suitability analysis based on Kirinyaga's nutrient profile

Kirinyaga County is a challenging environment for Cowpeas (soil-match score 43/100) and will need significant amendment before planting. Local soils average pH 5.31 — moderately acidic and inside the 5–8 band Cowpeas prefers, so no lime is usually required. Nitrogen (1.36 g/kg), phosphorus (12.5 mg/kg) and potassium (177 mg/kg) all meet Cowpeas's requirements, so a maintenance fertilizer programme is enough. Cowpeas prefers sandy soils, while Kirinyaga is largely clay, so drainage and organic-matter management matter more here. Cowpeas's full potential is about 450 kg/acre (~KES 29,250/acre at KES 65/kg), but at Kirinyaga's 43/100 suitability a realistic target here is closer to 242 kg/acre (~KES 15,730/acre) unless the constraints above are addressed.