Growing Kale (Sukuma Wiki) in Kitui

Soil suitability analysis based on Kitui's nutrient profile

Kitui County is a challenging environment for Kale (Sukuma Wiki) (soil-match score 35/100) and will need significant amendment before planting. At an average pH of 7.03 the soil sits above Kale (Sukuma Wiki)'s preferred 5–7 range, which can limit uptake of phosphorus and micronutrients. The main gap is nitrogen — measured at N 0.74 g/kg, P 30.5 mg/kg, K 339 mg/kg against this crop's high/medium/medium demand — so the fertilizer plan below prioritises closing that deficit. The county's predominantly sandy loam soils suit Kale (Sukuma Wiki), which favours clay loam. Kitui receives approximately 500 mm/year — well below Kale (Sukuma Wiki)'s minimum of 700 mm — so supplemental irrigation would be essential for this crop. At current prices (about KES 20/kg) and a typical 5,000 kg/acre yield, a well-managed Kale (Sukuma Wiki) crop here can gross roughly KES 100,000 per acre.