Growing Watermelon in Tharaka Nithi
Soil suitability analysis based on Tharaka Nithi's nutrient profile
Yes, with the right inputs — Tharaka Nithi is moderately suited to Watermelon. Tharaka Nithi's soil (pH 4.99, strongly acidic) gives Watermelon a suitability score of 55/100. Apply agricultural lime before planting to unlock phosphorus and lift the score.
Watermelon can be grown in Tharaka Nithi County, but the soil scores 55/100 and needs targeted management to reach full potential. At an average pH of 4.99 the soil is strongly acidic, below Watermelon's preferred 6–7.5 range; agricultural lime will lift pH and unlock phosphorus the crop cannot otherwise access. Nitrogen (1.23 g/kg), phosphorus (19.6 mg/kg) and potassium (211 mg/kg) all meet Watermelon's requirements, so a maintenance fertilizer programme is enough. The county's predominantly sandy loam soils suit Watermelon, which favours sandy. On ShambaIQ's soil-match model, Watermelon is the #76 soil match of the 106 crops we assess for Tharaka Nithi County. Watermelon's full potential is about 15,000 kg/acre (~KES 150,000/acre at KES 10/kg), but at Tharaka Nithi's 55/100 suitability a realistic target here is closer to 10,313 kg/acre (~KES 103,130/acre) unless the constraints above are addressed.
Better matched to Tharaka Nithi's soil: Avocado, Macadamia, and Cassava — each scores higher on the same soil.
Soil & climate match
| Factor | Tharaka Nithi soil | Watermelon needs | Status |
|---|---|---|---|
| pH | 4.99 | 6–7.5 | Adjust |
| Nitrogen | 1.23 g/kg | min 0.8 g/kg | OK |
| Phosphorus | 19.6 mg/kg | min 12 mg/kg | OK |
| Potassium | 211 mg/kg | min 150 mg/kg | OK |
| Rainfall | 900 mm | 300–700 mm | High |
| Altitude | 1,100 m | 0–1,500 m | OK |
Top dressing guide
Tharaka Nithi's nitrogen (1.23 g/kg) already meets Watermelon's 0.8 g/kg requirement, so this is a maintenance rate.
Seed varieties for Tharaka Nithi
Varieties suited to Tharaka Nithi's 1,100 m altitude and 900 mm annual rainfall — 1 of 2 watermelon varieties we list.
Economics
Fertilizer prices
Green = subsidized · (Commercial) per 50kg bag