Growing Arrow Root in Mandera

Soil suitability analysis based on Mandera's nutrient profile

Mandera County is a challenging environment for Arrow Root (soil-match score 1/100) and will need significant amendment before planting. At an average pH of 8.38 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 0.53 g/kg, P 38.3 mg/kg, K 420 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 Mandera is largely sandy, so drainage and organic-matter management matter more here. Mandera receives approximately 180 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 Mandera's 1/100 suitability a realistic target here is closer to 63 kg/acre (~KES 3,465/acre) unless the constraints above are addressed.