Growing Napier Grass in Tana River

Soil suitability analysis based on Tana River's nutrient profile

Tana River County is a challenging environment for Napier Grass (soil-match score 23/100) and will need significant amendment before planting. Local soils average pH 6.4 — slightly acidic to near-neutral and inside the 5–8 band Napier Grass prefers, so no lime is usually required. The main gap is potassium — measured at N 1.04 g/kg, P 8.5 mg/kg, K 108 mg/kg against this crop's medium/low/medium demand — so the fertilizer plan below prioritises closing that deficit. Napier Grass prefers 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 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 Tana River's 23/100 suitability a realistic target here is closer to 8,625 kg/acre (~KES 43,125/acre) unless the constraints above are addressed.