Growing Onion in Marsabit
Soil suitability analysis based on Marsabit's nutrient profile
Generally not ideal — Marsabit is poorly suited to Onion. Marsabit's soil (pH 8.22, alkaline) gives Onion a suitability score of 18/100. Match fertilizer to Marsabit's nitrogen and phosphorus levels for the best result.
Marsabit County is a challenging environment for Onion (soil-match score 18/100) and will need significant amendment before planting. At an average pH of 8.22 the soil sits above Onion's preferred 6–7 range, which can limit uptake of phosphorus and micronutrients. The main gap is nitrogen — measured at N 0.52 g/kg, P 37.3 mg/kg, K 420 mg/kg against this crop's high/high/medium demand — so the fertilizer plan below prioritises closing that deficit. The county's predominantly sandy soils suit Onion, which favours sandy loam. Marsabit receives approximately 300 mm/year — well below Onion's minimum of 500 mm — so supplemental irrigation would be essential for this crop. On ShambaIQ's soil-match model, Onion is the #38 soil match of the 106 crops we assess for Marsabit County. Onion's full potential is about 6,000 kg/acre (~KES 420,000/acre at KES 70/kg), but at Marsabit's 18/100 suitability a realistic target here is closer to 1,350 kg/acre (~KES 94,500/acre) unless the constraints above are addressed.
Better matched to Marsabit's soil: Sisal, Chia, and Aloe Vera — each scores higher on the same soil.
Soil & climate match
| Factor | Marsabit soil | Onion needs | Status |
|---|---|---|---|
| pH | 8.22 | 6–7 | Adjust |
| Nitrogen | 0.52 g/kg | min 1.2 g/kg | Low |
| Phosphorus | 37.3 mg/kg | min 20 mg/kg | OK |
| Potassium | 420 mg/kg | min 150 mg/kg | OK |
| Rainfall | 300 mm | 500–1,000 mm | Low |
| Altitude | 1,100 m | 0–2,000 m | OK |
Planting calendar for Marsabit
Long Rains· March–May
Short Rains· October–DecemberMain season here
Dry Season· January–March
Top dressing guide
Marsabit's nitrogen (0.52 g/kg) is 43% of the 1.2 g/kg Onion needs, so the standard 0.5 bags/acre is raised to 0.75. Split it across two applications to limit leaching.
Recommended seed varieties
No variety in our list is specifically rated for Marsabit's 1,100 m altitude and 300 mm rainfall, so all 2 are shown. Confirm with your agrovet before buying.
Economics
Fertilizer prices
Green = subsidized · (Commercial) per 50kg bag