Growing Oilseed Rape (Canola) in Vihiga
Soil suitability analysis based on Vihiga's nutrient profile
Generally not ideal — Vihiga is poorly suited to Oilseed Rape (Canola). Vihiga's soil (pH 5.62, slightly acidic) gives Oilseed Rape (Canola) a suitability score of 35/100. Match fertilizer to Vihiga's nitrogen and phosphorus levels for the best result.
Vihiga County is a challenging environment for Oilseed Rape (Canola) (soil-match score 35/100) and will need significant amendment before planting. At an average pH of 5.62 the soil is slightly acidic to near-neutral, below Oilseed Rape (Canola)'s preferred 5.8–7.5 range; agricultural lime will lift pH and unlock phosphorus the crop cannot otherwise access. The main gap is nitrogen and phosphorus — measured at N 1.02 g/kg, P 14.8 mg/kg, K 164 mg/kg against this crop's high/high/medium demand — so the fertilizer plan below prioritises closing those deficits. The county's predominantly clay loam soils suit Oilseed Rape (Canola), which favours loam. On ShambaIQ's soil-match model, Oilseed Rape (Canola) is the #91 soil match of the 106 crops we assess for Vihiga County. Oilseed Rape (Canola)'s full potential is about 1,000 kg/acre (~KES 60,000/acre at KES 60/kg), but at Vihiga's 35/100 suitability a realistic target here is closer to 438 kg/acre (~KES 26,280/acre) unless the constraints above are addressed.
Better matched to Vihiga's soil: Sweet Potato, Soybeans, and Coffee (Arabica) — each scores higher on the same soil.
Soil & climate match
| Factor | Vihiga soil | Oilseed Rape (Canola) needs | Status |
|---|---|---|---|
| pH | 5.62 | 5.8–7.5 | Adjust |
| Nitrogen | 1.02 g/kg | min 1.2 g/kg | Low |
| Phosphorus | 14.8 mg/kg | min 20 mg/kg | Low |
| Potassium | 164 mg/kg | min 150 mg/kg | OK |
| Rainfall | 1,800 mm | 400–900 mm | High |
| Altitude | 1,700 m | 1,500–2,800 m | OK |
Planting calendar for Vihiga
Long Rains· March–MayMain season here
Short Rains· August–October
Top dressing guide
Vihiga's nitrogen (1.02 g/kg) is 85% of the 1.2 g/kg Oilseed Rape (Canola) needs, so the standard 0.5 bags/acre is raised to 0.75. Split it across two applications to limit leaching.
Economics
Fertilizer prices
Green = subsidized · (Commercial) per 50kg bag