Growing Kale (Sukuma Wiki) in Tana River

Soil suitability analysis based on Tana River's nutrient profile

Tana River County is a challenging environment for Kale (Sukuma Wiki) (soil-match score 4/100) and will need significant amendment before planting. Local soils average pH 6.4 — slightly acidic to near-neutral and inside the 5–7 band Kale (Sukuma Wiki) prefers, so no lime is usually required. The main gap is nitrogen, phosphorus, and potassium — measured at N 1.04 g/kg, P 8.5 mg/kg, K 108 mg/kg against this crop's high/medium/medium demand — so the fertilizer plan below prioritises closing those deficits. Kale (Sukuma Wiki) prefers clay loam soils, while Tana River is largely sandy, so drainage and organic-matter management matter more here. Tana River receives approximately 400 mm/year — well below Kale (Sukuma Wiki)'s minimum of 700 mm — so supplemental irrigation would be essential for this crop. Kale (Sukuma Wiki)'s full potential is about 12,000 kg/acre (~KES 240,000/acre at KES 20/kg), but at Tana River's 4/100 suitability a realistic target here is closer to 600 kg/acre (~KES 12,000/acre) unless the constraints above are addressed.