Growing Quinoa in Kirinyaga

Soil suitability analysis based on Kirinyaga's nutrient profile

Kirinyaga County is a challenging environment for Quinoa (soil-match score 42/100) and will need significant amendment before planting. At an average pH of 5.31 the soil is moderately acidic, below Quinoa's preferred 6–8.5 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 Quinoa's requirements, so a maintenance fertilizer programme is enough. Quinoa prefers loam soils, while Kirinyaga is largely clay, so drainage and organic-matter management matter more here. Quinoa's full potential is about 700 kg/acre (~KES 105,000/acre at KES 150/kg), but at Kirinyaga's 42/100 suitability a realistic target here is closer to 368 kg/acre (~KES 55,200/acre) unless the constraints above are addressed.