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. The county's predominantly sandy loam soils suit Arrow Root, which favours clay loam. Laikipia receives approximately 600 mm/year — well below Arrow Root's minimum of 1000 mm — so supplemental irrigation would be essential for this crop. At current prices (about KES 55/kg) and a typical 4,500 kg/acre yield, a well-managed Arrow Root crop here can gross roughly KES 247,500 per acre.