Growing Sweet Potato in Garissa

Soil suitability analysis based on Garissa's nutrient profile

Garissa County is a challenging environment for Sweet Potato (soil-match score 10/100) and will need significant amendment before planting. At an average pH of 7.96 the soil sits above Sweet Potato's preferred 4.5–7 range, which can limit uptake of phosphorus and micronutrients. Nitrogen (0.61 g/kg), phosphorus (37.7 mg/kg) and potassium (407 mg/kg) all meet Sweet Potato's requirements, so a maintenance fertilizer programme is enough. The county's predominantly sandy soils suit Sweet Potato, which favours sandy loam. Garissa receives approximately 250 mm/year — well below Sweet Potato's minimum of 600 mm — so supplemental irrigation would be essential for this crop. On ShambaIQ's soil-match model, Sweet Potato is the #45 soil match of the 106 crops we assess for Garissa County. Sweet Potato's full potential is about 5,000 kg/acre (~KES 90,000/acre at KES 18/kg), but at Garissa's 10/100 suitability a realistic target here is closer to 625 kg/acre (~KES 11,250/acre) unless the constraints above are addressed.

Better matched to Garissa's soil: Sisal, Aloe Vera, and Green Grams — each scores higher on the same soil.