Growing Arrow Root in Nyandarua

Soil suitability analysis based on Nyandarua's nutrient profile

Arrow Root can be grown in Nyandarua County, but the soil scores 52/100 and needs targeted management to reach full potential. Local soils average pH 5.38 — moderately acidic and inside the 5–7 band Arrow Root prefers, so no lime is usually required. The main gap is potassium — measured at N 1.28 g/kg, P 14 mg/kg, K 166 mg/kg against this crop's medium/medium/high demand — so the fertilizer plan below prioritises closing that deficit. The county's predominantly clay soils suit Arrow Root, which favours clay loam. At 2300 m, the county sits above Arrow Root's preferred altitude ceiling of 1800 m, where frost risk and cold nights reduce the crop's productivity. Arrow Root's full potential is about 5,000 kg/acre (~KES 275,000/acre at KES 55/kg), but at Nyandarua's 52/100 suitability a realistic target here is closer to 3,250 kg/acre (~KES 178,750/acre) unless the constraints above are addressed.