Growing Barley in Tharaka Nithi

Soil suitability analysis based on Tharaka Nithi's nutrient profile

Tharaka Nithi County is a challenging environment for Barley (soil-match score 19/100) and will need significant amendment before planting. At an average pH of 4.99 the soil is strongly acidic, below Barley's preferred 6–7.5 range; agricultural lime will lift pH and unlock phosphorus the crop cannot otherwise access. The main gap is phosphorus — measured at N 1.23 g/kg, P 19.6 mg/kg, K 211 mg/kg against this crop's medium/high/medium demand — so the fertilizer plan below prioritises closing that deficit. The county's predominantly sandy loam soils suit Barley, which favours loam. At 1100 m, the county sits below Barley's preferred altitude range (2000–3000 m), which limits yield potential due to heat stress. On ShambaIQ's soil-match model, Barley is the #104 soil match of the 106 crops we assess for Tharaka Nithi County. Barley's full potential is about 1,600 kg/acre (~KES 67,200/acre at KES 42/kg), but at Tharaka Nithi's 19/100 suitability a realistic target here is closer to 380 kg/acre (~KES 15,960/acre) unless the constraints above are addressed.

Better matched to Tharaka Nithi's soil: Avocado, Macadamia, and Cassava — each scores higher on the same soil.