Growing Chia in Tana River

Soil suitability analysis based on Tana River's nutrient profile

Tana River County is a challenging environment for Chia (soil-match score 3/100) and will need significant amendment before planting. Local soils average pH 6.4 — slightly acidic to near-neutral and inside the 6–8 band Chia prefers, so no lime is usually required. The main gap is phosphorus — measured at N 1.04 g/kg, P 8.5 mg/kg, K 108 mg/kg against this crop's low/medium/low demand — so the fertilizer plan below prioritises closing that deficit. The county's predominantly sandy soils suit Chia, which favours sandy loam. At 200 m, the county sits below Chia's preferred altitude range (1000–2200 m), which limits yield potential due to heat stress. Chia's full potential is about 400 kg/acre (~KES 60,000/acre at KES 150/kg), but at Tana River's 3/100 suitability a realistic target here is closer to 15 kg/acre (~KES 2,250/acre) unless the constraints above are addressed.