Growing Turmeric in Kiambu
Soil suitability analysis based on Kiambu's nutrient profile
Possible but challenging — Kiambu is only marginally suited to Turmeric. Kiambu's soil (pH 5.28, strongly acidic) gives Turmeric a suitability score of 50/100. Apply agricultural lime before planting to unlock phosphorus and lift the score.
Turmeric can be grown in Kiambu County, but the soil scores 50/100 and needs targeted management to reach full potential. At an average pH of 5.28 the soil is moderately acidic, below Turmeric's preferred 5.5–7.5 range; agricultural lime will lift pH and unlock phosphorus the crop cannot otherwise access. The main gap is nitrogen, phosphorus, and potassium — measured at N 1.01 g/kg, P 13.7 mg/kg, K 169 mg/kg against this crop's high/high/high demand — so the fertilizer plan below prioritises closing those deficits. Turmeric prefers loam soils, while Kiambu is largely clay, so drainage and organic-matter management matter more here. On ShambaIQ's soil-match model, Turmeric is the #88 soil match of the 106 crops we assess for Kiambu County. Turmeric's full potential is about 6,000 kg/acre (~KES 480,000/acre at KES 80/kg), but at Kiambu's 50/100 suitability a realistic target here is closer to 3,750 kg/acre (~KES 300,000/acre) unless the constraints above are addressed.
Better matched to Kiambu's soil: Macadamia, Avocado, and Pineapple — each scores higher on the same soil.
Soil & climate match
| Factor | Kiambu soil | Turmeric needs | Status |
|---|---|---|---|
| pH | 5.28 | 5.5–7.5 | Adjust |
| Nitrogen | 1.01 g/kg | min 1.2 g/kg | Low |
| Phosphorus | 13.7 mg/kg | min 20 mg/kg | Low |
| Potassium | 169 mg/kg | min 200 mg/kg | Low |
| Rainfall | 1,100 mm | 1,000–2,000 mm | OK |
| Altitude | 1,700 m | 0–1,500 m | High |
Planting calendar for Kiambu
Long Rains· March–MayMain season here
Short Rains· October–December
Top dressing guide
Kiambu's nitrogen (1.01 g/kg) is 84% of the 1.2 g/kg Turmeric 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