Growing Arrow Root in Garissa

Soil suitability analysis based on Garissa's nutrient profile

Garissa County is a challenging environment for Arrow Root (soil-match score 3/100) and will need significant amendment before planting. At an average pH of 7.96 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 0.61 g/kg, P 37.7 mg/kg, K 407 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 Garissa is largely sandy, so drainage and organic-matter management matter more here. Garissa receives approximately 250 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 Garissa's 3/100 suitability a realistic target here is closer to 188 kg/acre (~KES 10,340/acre) unless the constraints above are addressed.