Growing Arrow Root in Isiolo

Soil suitability analysis based on Isiolo's nutrient profile

Isiolo County is a challenging environment for Arrow Root (soil-match score 6/100) and will need significant amendment before planting. At an average pH of 7.83 the soil sits above Arrow Root's preferred 5–7 range, which can limit uptake of phosphorus and micronutrients. The main gap is nitrogen — measured at N 0.46 g/kg, P 37.4 mg/kg, K 395 mg/kg against this crop's medium/medium/high demand — so the fertilizer plan below prioritises closing that deficit. Arrow Root prefers clay loam soils, while Isiolo is largely sandy, so drainage and organic-matter management matter more here. Isiolo receives approximately 350 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 Isiolo's 6/100 suitability a realistic target here is closer to 375 kg/acre (~KES 20,625/acre) unless the constraints above are addressed.