Growing Napier Grass in Tharaka Nithi
Soil suitability analysis based on Tharaka Nithi's nutrient profile
Yes, with the right inputs — Tharaka Nithi is moderately suited to Napier Grass. Tharaka Nithi's soil (pH 4.99, strongly acidic) gives Napier Grass a suitability score of 68/100. Apply agricultural lime before planting to unlock phosphorus and lift the score.
Tharaka Nithi County is a solid choice for Napier Grass, with a soil-match score of 68/100. At an average pH of 4.99 the soil is strongly acidic, below Napier Grass's preferred 5–8 range; agricultural lime will lift pH and unlock phosphorus the crop cannot otherwise access. Nitrogen (1.23 g/kg), phosphorus (19.6 mg/kg) and potassium (211 mg/kg) all meet Napier Grass's requirements, so a maintenance fertilizer programme is enough. The county's predominantly sandy loam soils suit Napier Grass, which favours loam. Napier Grass's full potential is about 30,000 kg/acre (~KES 150,000/acre at KES 5/kg), but at Tharaka Nithi's 68/100 suitability a realistic target here is closer to 25,500 kg/acre (~KES 127,500/acre) unless the constraints above are addressed.
Soil & climate match
| Factor | Tharaka Nithi soil | Napier Grass needs | Status |
|---|---|---|---|
| pH | 4.99 | 5–8 | Adjust |
| Nitrogen | 1.23 g/kg | min 0.8 g/kg | OK |
| Phosphorus | 19.6 mg/kg | min 6 mg/kg | OK |
| Potassium | 211 mg/kg | min 150 mg/kg | OK |
| Rainfall | 900 mm | 800–2,000 mm | OK |
| Altitude | 1,100 m | 0–2,500 m | OK |
Top dressing guide
Recommended seed varieties
Economics
Fertilizer prices
Green = subsidized · (Commercial) per 50kg bag