Growing Arrow Root in Laikipia

Soil suitability analysis based on Laikipia's nutrient profile

Laikipia County is a challenging environment for Arrow Root (soil-match score 28/100) and will need significant amendment before planting. At an average pH of 4.99 the soil is strongly acidic, below Arrow Root's preferred 5–7 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 Arrow Root's requirements, so a maintenance fertilizer programme is enough. Arrow Root prefers clay loam soils, while Laikipia is largely sandy loam, so drainage and organic-matter management matter more here. Laikipia receives approximately 600 mm/year — well below Arrow Root's minimum of 1000 mm — so supplemental irrigation would be essential for this crop. Arrow Root's full potential is about 5,000 kg/acre (~KES 275,000/acre at KES 55/kg), but at Laikipia's 28/100 suitability a realistic target here is closer to 1,750 kg/acre (~KES 96,250/acre) unless the constraints above are addressed.