Growing Arrow Root in Kitui

Soil suitability analysis based on Kitui's nutrient profile

Kitui County is a challenging environment for Arrow Root (soil-match score 18/100) and will need significant amendment before planting. At an average pH of 7.03 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 0.74 g/kg, P 30.5 mg/kg, K 339 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 Kitui is largely sandy loam, so drainage and organic-matter management matter more here. Kitui receives approximately 500 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 Kitui's 18/100 suitability a realistic target here is closer to 1,125 kg/acre (~KES 61,875/acre) unless the constraints above are addressed.