Growing Sunflower in Nyandarua
Soil suitability analysis based on Nyandarua's nutrient profile
Possible but challenging — Nyandarua is only marginally suited to Sunflower. Nyandarua's soil (pH 5.38, strongly acidic) gives Sunflower a suitability score of 43/100. Apply agricultural lime before planting to unlock phosphorus and lift the score.
Nyandarua County is a challenging environment for Sunflower (soil-match score 43/100) and will need significant amendment before planting. At an average pH of 5.38 the soil is moderately acidic, below Sunflower's preferred 6–7.5 range; agricultural lime will lift pH and unlock phosphorus the crop cannot otherwise access. Nitrogen (1.28 g/kg), phosphorus (14 mg/kg) and potassium (166 mg/kg) all meet Sunflower's requirements, so a maintenance fertilizer programme is enough. Sunflower prefers sandy soils, while Nyandarua is largely clay, so drainage and organic-matter management matter more here. On ShambaIQ's soil-match model, Sunflower is the #77 soil match of the 106 crops we assess for Nyandarua County. Sunflower's full potential is about 750 kg/acre (~KES 36,000/acre at KES 48/kg), but at Nyandarua's 43/100 suitability a realistic target here is closer to 403 kg/acre (~KES 19,344/acre) unless the constraints above are addressed.
Better matched to Nyandarua's soil: Tea, Pyrethrum, and Potato — each scores higher on the same soil.
Soil & climate match
| Factor | Nyandarua soil | Sunflower needs | Status |
|---|---|---|---|
| pH | 5.38 | 6–7.5 | Adjust |
| Nitrogen | 1.28 g/kg | min 0.8 g/kg | OK |
| Phosphorus | 14 mg/kg | min 12 mg/kg | OK |
| Potassium | 166 mg/kg | min 150 mg/kg | OK |
| Rainfall | 1,100 mm | 400–800 mm | High |
| Altitude | 2,300 m | 0–2,000 m | High |
Planting calendar for Nyandarua
Long Rains· March–MayMain season here
Short Rains· October–December
Dry Season· January–March
Top dressing guide
Nyandarua's nitrogen (1.28 g/kg) already meets Sunflower's 0.8 g/kg requirement, so this is a maintenance rate.
Recommended seed varieties
No variety in our list is specifically rated for Nyandarua's 2,300 m altitude and 1,100 mm rainfall, so all 2 are shown. Confirm with your agrovet before buying.
Economics
Fertilizer prices
Green = subsidized · (Commercial) per 50kg bag