Growing Pyrethrum in Nairobi
Soil suitability analysis based on Nairobi's nutrient profile
Nairobi County is a solid choice for Pyrethrum, with a soil-match score of 68/100. At an average pH of 6.85 the soil sits above Pyrethrum's preferred 5–6.5 range, which can limit uptake of phosphorus and micronutrients. Nitrogen (1.1 g/kg), phosphorus (22.1 mg/kg) and potassium (236 mg/kg) all meet Pyrethrum's requirements, so a maintenance fertilizer programme is enough. The county's predominantly clay loam soils suit Pyrethrum, which favours loam. Pyrethrum's full potential is about 500 kg/acre (~KES 140,000/acre at KES 280/kg), but at Nairobi's 68/100 suitability a realistic target here is closer to 425 kg/acre (~KES 119,000/acre) unless the constraints above are addressed.
Soil & climate match
| Factor | Nairobi soil | Pyrethrum needs | Status |
|---|---|---|---|
| pH | 6.85 | 5–6.5 | Adjust |
| Nitrogen | 1.1 g/kg | min 0.8 g/kg | OK |
| Phosphorus | 22.1 mg/kg | min 20 mg/kg | OK |
| Potassium | 236 mg/kg | min 150 mg/kg | OK |
| Rainfall | 900 mm | 900–1,500 mm | OK |
| Altitude | 1,700 m | 1,800–3,000 m | Low |
Top dressing guide
Recommended seed varieties
Economics
Fertilizer prices
Green = subsidized · (Commercial) per 50kg bag