Growing Arrow Root in Tana River

Soil suitability analysis based on Tana River's nutrient profile

Tana River County is a challenging environment for Arrow Root (soil-match score 13/100) and will need significant amendment before planting. Local soils average pH 6.4 — slightly acidic to near-neutral and inside the 5–7 band Arrow Root prefers, so no lime is usually required. The main gap is phosphorus and potassium — measured at N 1.04 g/kg, P 8.5 mg/kg, K 108 mg/kg against this crop's medium/medium/high demand — so the fertilizer plan below prioritises closing those deficits. Arrow Root prefers clay loam soils, while Tana River is largely sandy, so drainage and organic-matter management matter more here. Tana River receives approximately 400 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 Tana River's 13/100 suitability a realistic target here is closer to 813 kg/acre (~KES 44,715/acre) unless the constraints above are addressed.