Growing Yams in Laikipia

Soil suitability analysis based on Laikipia's nutrient profile

Laikipia County is a challenging environment for Yams (soil-match score 20/100) and will need significant amendment before planting. At an average pH of 4.99 the soil is strongly acidic, below Yams's preferred 5.5–6.5 range; agricultural lime will lift pH and unlock phosphorus the crop cannot otherwise access. Nitrogen (1.42 g/kg), phosphorus (16.6 mg/kg) and potassium (215 mg/kg) all meet Yams's requirements, so a maintenance fertilizer programme is enough. The county's predominantly sandy loam soils suit Yams, which favours sandy loam. Laikipia receives approximately 600 mm/year — well below Yams's minimum of 1200 mm — so supplemental irrigation would be essential for this crop. On ShambaIQ's soil-match model, Yams is the #98 soil match of the 106 crops we assess for Laikipia County. Yams's full potential is about 7,000 kg/acre (~KES 560,000/acre at KES 80/kg), but at Laikipia's 20/100 suitability a realistic target here is closer to 1,750 kg/acre (~KES 140,000/acre) unless the constraints above are addressed.

Better matched to Laikipia's soil: Sweet Potato, Finger Millet, and Groundnuts — each scores higher on the same soil.