Growing Sisal in Kirinyaga

Soil suitability analysis based on Kirinyaga's nutrient profile

Kirinyaga County is a challenging environment for Sisal (soil-match score 37/100) and will need significant amendment before planting. At an average pH of 5.31 the soil is moderately acidic, below Sisal's preferred 5.5–8.5 range; agricultural lime will lift pH and unlock phosphorus the crop cannot otherwise access. Nitrogen (1.36 g/kg), phosphorus (12.5 mg/kg) and potassium (177 mg/kg) all meet Sisal's requirements, so a maintenance fertilizer programme is enough. Sisal prefers sandy soils, while Kirinyaga is largely clay, so drainage and organic-matter management matter more here. Sisal's full potential is about 1,000 kg/acre (~KES 90,000/acre at KES 90/kg), but at Kirinyaga's 37/100 suitability a realistic target here is closer to 463 kg/acre (~KES 41,670/acre) unless the constraints above are addressed.