Growing Napier Grass in Wajir

Soil suitability analysis based on Wajir's nutrient profile

Wajir County is a challenging environment for Napier Grass (soil-match score 3/100) and will need significant amendment before planting. At an average pH of 8.4 the soil sits above Napier Grass's preferred 5–8 range, which can limit uptake of phosphorus and micronutrients. The main gap is nitrogen — measured at N 0.52 g/kg, P 39.3 mg/kg, K 396 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 Wajir is largely sandy, so drainage and organic-matter management matter more here. Wajir receives approximately 200 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 Wajir's 3/100 suitability a realistic target here is closer to 1,125 kg/acre (~KES 5,625/acre) unless the constraints above are addressed.