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. The county's predominantly sandy loam soils suit Arrow Root, which favours clay loam. Kitui receives approximately 500 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.