Growing Watermelon in Trans Nzoia

Soil suitability analysis based on Trans Nzoia's nutrient profile

Trans Nzoia County is a challenging environment for Watermelon (soil-match score 33/100) and will need significant amendment before planting. At an average pH of 5.93 the soil is slightly acidic to near-neutral, below Watermelon's preferred 6–7.5 range; agricultural lime will lift pH and unlock phosphorus the crop cannot otherwise access. Nitrogen (1.68 g/kg), phosphorus (27.3 mg/kg) and potassium (213 mg/kg) all meet Watermelon's requirements, so a maintenance fertilizer programme is enough. Watermelon prefers sandy soils, while Trans Nzoia is largely clay loam, so drainage and organic-matter management matter more here. At 1900 m, the county sits above Watermelon's preferred altitude ceiling of 1500 m, where frost risk and cold nights reduce the crop's productivity. Watermelon's full potential is about 15,000 kg/acre (~KES 150,000/acre at KES 10/kg), but at Trans Nzoia's 33/100 suitability a realistic target here is closer to 6,188 kg/acre (~KES 61,880/acre) unless the constraints above are addressed.