Growing Rosemary in Turkana
Soil suitability analysis based on Turkana's nutrient profile
Generally not ideal — Turkana is poorly suited to Rosemary. Turkana's soil (pH 7.95, alkaline) gives Rosemary a suitability score of 9/100. Match fertilizer to Turkana's nitrogen and phosphorus levels for the best result.
Turkana County is a challenging environment for Rosemary (soil-match score 9/100) and will need significant amendment before planting. Local soils average pH 7.95 — alkaline and inside the 6–8 band Rosemary prefers, so no lime is usually required. The main gap is nitrogen — measured at N 0.41 g/kg, P 38.5 mg/kg, K 417 mg/kg against this crop's medium/medium/medium demand — so the fertilizer plan below prioritises closing that deficit. The county's predominantly sandy soils suit Rosemary, which favours sandy loam. At 400 m, the county sits below Rosemary's preferred altitude range (800–2400 m), which limits yield potential due to heat stress. On ShambaIQ's soil-match model, Rosemary is the #54 soil match of the 106 crops we assess for Turkana County. Rosemary's full potential is about 2,500 kg/acre (~KES 375,000/acre at KES 150/kg), but at Turkana's 9/100 suitability a realistic target here is closer to 281 kg/acre (~KES 42,150/acre) unless the constraints above are addressed.
Better matched to Turkana's soil: Sisal, Aloe Vera, and Green Grams — each scores higher on the same soil.
Soil & climate match
| Factor | Turkana soil | Rosemary needs | Status |
|---|---|---|---|
| pH | 7.95 | 6–8 | OK |
| Nitrogen | 0.41 g/kg | min 0.8 g/kg | Low |
| Phosphorus | 38.5 mg/kg | min 12 mg/kg | OK |
| Potassium | 417 mg/kg | min 150 mg/kg | OK |
| Rainfall | 300 mm | 400–900 mm | Low |
| Altitude | 400 m | 800–2,400 m | Low |
Planting calendar for Turkana
Long Rains· March–May
Short Rains· October–DecemberMain season here
Top dressing guide
Turkana's nitrogen (0.41 g/kg) is 51% of the 0.8 g/kg Rosemary needs, so the standard 0.2 bags/acre is raised to 0.25. Split it across two applications to limit leaching.
Economics
Fertilizer prices
Green = subsidized · (Commercial) per 50kg bag