Growing Oats in Tharaka Nithi

Soil suitability analysis based on Tharaka Nithi's nutrient profile

Tharaka Nithi County is a challenging environment for Oats (soil-match score 27/100) and will need significant amendment before planting. At an average pH of 4.99 the soil is strongly acidic, below Oats's preferred 5.5–7 range; agricultural lime will lift pH and unlock phosphorus the crop cannot otherwise access. Nitrogen (1.23 g/kg), phosphorus (19.6 mg/kg) and potassium (211 mg/kg) all meet Oats's requirements, so a maintenance fertilizer programme is enough. The county's predominantly sandy loam soils suit Oats, which favours loam. At 1100 m, the county sits below Oats's preferred altitude range (1800–3000 m), which limits yield potential due to heat stress. Oats's full potential is about 1,600 kg/acre (~KES 64,000/acre at KES 40/kg), but at Tharaka Nithi's 27/100 suitability a realistic target here is closer to 540 kg/acre (~KES 21,600/acre) unless the constraints above are addressed.