Growing Grapes in Siaya

Soil suitability analysis based on Siaya's nutrient profile

Grapes can be grown in Siaya County, but the soil scores 54/100 and needs targeted management to reach full potential. At an average pH of 5.33 the soil is moderately acidic, below Grapes's preferred 6–7.5 range; agricultural lime will lift pH and unlock phosphorus the crop cannot otherwise access. The main gap is phosphorus and potassium — measured at N 1.2 g/kg, P 12.1 mg/kg, K 134 mg/kg against this crop's medium/high/high demand — so the fertilizer plan below prioritises closing those deficits. The county's predominantly clay loam soils suit Grapes, which favours loam. Grapes's full potential is about 8,000 kg/acre (~KES 1,200,000/acre at KES 150/kg), but at Siaya's 54/100 suitability a realistic target here is closer to 5,400 kg/acre (~KES 810,000/acre) unless the constraints above are addressed.