Growing Sunflower in Vihiga
Soil suitability analysis based on Vihiga's nutrient profile
Generally not ideal — Vihiga is poorly suited to Sunflower. Vihiga's soil (pH 5.62, slightly acidic) gives Sunflower a suitability score of 37/100. Match fertilizer to Vihiga's nitrogen and phosphorus levels for the best result.
Vihiga County is a challenging environment for Sunflower (soil-match score 37/100) and will need significant amendment before planting. At an average pH of 5.62 the soil is slightly acidic to near-neutral, below Sunflower's preferred 6–7.5 range; agricultural lime will lift pH and unlock phosphorus the crop cannot otherwise access. Nitrogen (1.02 g/kg), phosphorus (14.8 mg/kg) and potassium (164 mg/kg) all meet Sunflower's requirements, so a maintenance fertilizer programme is enough. Sunflower prefers sandy soils, while Vihiga is largely clay loam, so drainage and organic-matter management matter more here. On ShambaIQ's soil-match model, Sunflower is the #87 soil match of the 106 crops we assess for Vihiga County. Sunflower's full potential is about 750 kg/acre (~KES 36,000/acre at KES 48/kg), but at Vihiga's 37/100 suitability a realistic target here is closer to 347 kg/acre (~KES 16,656/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 | Sunflower needs | Status |
|---|---|---|---|
| pH | 5.62 | 6–7.5 | Adjust |
| Nitrogen | 1.02 g/kg | min 0.8 g/kg | OK |
| Phosphorus | 14.8 mg/kg | min 12 mg/kg | OK |
| Potassium | 164 mg/kg | min 150 mg/kg | OK |
| Rainfall | 1,800 mm | 400–800 mm | High |
| Altitude | 1,700 m | 0–2,000 m | OK |
Planting calendar for Vihiga
Long Rains· March–MayMain season here
Short Rains· August–October
Dry Season· January–March
Top dressing guide
Vihiga's nitrogen (1.02 g/kg) already meets Sunflower's 0.8 g/kg requirement, so this is a maintenance rate.
Seed varieties for Vihiga
Varieties suited to Vihiga's 1,700 m altitude and 1,800 mm annual rainfall — 2 of 2 sunflower varieties we list.
Economics
Fertilizer prices
Green = subsidized · (Commercial) per 50kg bag