Growing Napier Grass in Kitui

Soil suitability analysis based on Kitui's nutrient profile

Kitui County is a challenging environment for Napier Grass (soil-match score 33/100) and will need significant amendment before planting. Local soils average pH 7.03 — neutral and inside the 5–8 band Napier Grass prefers, so no lime is usually required. 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 medium/low/medium demand — so the fertilizer plan below prioritises closing that deficit. The county's predominantly sandy loam soils suit Napier Grass, which favours loam. Kitui receives approximately 500 mm/year — well below Napier Grass's minimum of 800 mm — so supplemental irrigation would be essential for this crop. Napier Grass's full potential is about 30,000 kg/acre (~KES 150,000/acre at KES 5/kg), but at Kitui's 33/100 suitability a realistic target here is closer to 12,375 kg/acre (~KES 61,875/acre) unless the constraints above are addressed.