Growing Cashew Nuts in Isiolo

Soil suitability analysis based on Isiolo's nutrient profile

Isiolo County is a challenging environment for Cashew Nuts (soil-match score 7/100) and will need significant amendment before planting. At an average pH of 7.83 the soil sits above Cashew Nuts's preferred 5–7.5 range, which can limit uptake of phosphorus and micronutrients. The main gap is nitrogen — measured at N 0.46 g/kg, P 37.4 mg/kg, K 395 mg/kg against this crop's low/low/medium demand — so the fertilizer plan below prioritises closing that deficit. The county's predominantly sandy soils suit Cashew Nuts, which favours sandy. Isiolo receives approximately 350 mm/year — well below Cashew Nuts's minimum of 600 mm — so supplemental irrigation would be essential for this crop. Cashew Nuts's full potential is about 900 kg/acre (~KES 247,500/acre at KES 275/kg), but at Isiolo's 7/100 suitability a realistic target here is closer to 79 kg/acre (~KES 21,725/acre) unless the constraints above are addressed.