Growing Sweet Corn in Isiolo
Soil suitability analysis based on Isiolo's nutrient profile
Generally not ideal — Isiolo is poorly suited to Sweet Corn. Isiolo's soil (pH 7.83, alkaline) gives Sweet Corn a suitability score of 27/100. Match fertilizer to Isiolo's nitrogen and phosphorus levels for the best result.
Isiolo County is a challenging environment for Sweet Corn (soil-match score 27/100) and will need significant amendment before planting. At an average pH of 7.83 the soil sits above Sweet Corn's preferred 5.8–7 range, which can limit uptake of phosphorus and micronutrients. The main gap is nitrogen — measured at N 0.46 g/kg, P 37.4 mg/kg, K 395 mg/kg against this crop's high/high/medium demand — so the fertilizer plan below prioritises closing that deficit. Sweet Corn prefers loam soils, while Isiolo is largely sandy, so drainage and organic-matter management matter more here. Isiolo receives approximately 350 mm/year — well below Sweet Corn's minimum of 500 mm — so supplemental irrigation would be essential for this crop. On ShambaIQ's soil-match model, Sweet Corn is the #41 soil match of the 106 crops we assess for Isiolo County. Sweet Corn's full potential is about 8,000 kg/acre (~KES 320,000/acre at KES 40/kg), but at Isiolo's 27/100 suitability a realistic target here is closer to 2,700 kg/acre (~KES 108,000/acre) unless the constraints above are addressed.
Better matched to Isiolo's soil: Sisal, Aloe Vera, and Green Grams — each scores higher on the same soil.
Soil & climate match
| Factor | Isiolo soil | Sweet Corn needs | Status |
|---|---|---|---|
| pH | 7.83 | 5.8–7 | Adjust |
| Nitrogen | 0.46 g/kg | min 1.2 g/kg | Low |
| Phosphorus | 37.4 mg/kg | min 20 mg/kg | OK |
| Potassium | 395 mg/kg | min 150 mg/kg | OK |
| Rainfall | 350 mm | 500–1,200 mm | Low |
| Altitude | 900 m | 0–2,200 m | OK |
Planting calendar for Isiolo
Long Rains· March–May
Short Rains· October–DecemberMain season here
Top dressing guide
Isiolo's nitrogen (0.46 g/kg) is 38% of the 1.2 g/kg Sweet Corn 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