Growing Oilseed Rape (Canola) in Siaya
Soil suitability analysis based on Siaya's nutrient profile
Siaya County is a challenging environment for Oilseed Rape (Canola) (soil-match score 33/100) and will need significant amendment before planting. At an average pH of 5.33 the soil is moderately acidic, 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 phosphorus and potassium — measured at N 1.2 g/kg, P 12.1 mg/kg, K 134 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. Oilseed Rape (Canola)'s full potential is about 1,000 kg/acre (~KES 60,000/acre at KES 60/kg), but at Siaya's 33/100 suitability a realistic target here is closer to 413 kg/acre (~KES 24,780/acre) unless the constraints above are addressed.
Soil & climate match
| Factor | Siaya soil | Oilseed Rape (Canola) needs | Status |
|---|---|---|---|
| pH | 5.33 | 5.8–7.5 | Adjust |
| Nitrogen | 1.2 g/kg | min 1.2 g/kg | OK |
| Phosphorus | 12.1 mg/kg | min 20 mg/kg | Low |
| Potassium | 134 mg/kg | min 150 mg/kg | Low |
| Rainfall | 1,200 mm | 400–900 mm | High |
| Altitude | 1,200 m | 1,500–2,800 m | Low |
Planting calendar
Long Rains
Short Rains
Top dressing guide
Economics
Fertilizer prices
Green = subsidized · (Commercial) per 50kg bag