Growing Coffee (Robusta) in Kwale

Soil suitability analysis based on Kwale's nutrient profile

Kwale County is a challenging environment for Coffee (Robusta) (soil-match score 25/100) and will need significant amendment before planting. At an average pH of 6.76 the soil sits above Coffee (Robusta)'s preferred 5–6.5 range, which can limit uptake of phosphorus and micronutrients. The main gap is nitrogen, phosphorus, and potassium — measured at N 0.93 g/kg, P 9.8 mg/kg, K 131 mg/kg against this crop's high/medium/high demand — so the fertilizer plan below prioritises closing those deficits. The county's predominantly sandy loam soils suit Coffee (Robusta), which favours loam. Kwale receives approximately 900 mm/year — well below Coffee (Robusta)'s minimum of 1500 mm — so supplemental irrigation would be essential for this crop. Coffee (Robusta)'s full potential is about 950 kg/acre (~KES 76,000/acre at KES 80/kg), but at Kwale's 25/100 suitability a realistic target here is closer to 297 kg/acre (~KES 23,760/acre) unless the constraints above are addressed.