Growing Onion in Machakos
Soil suitability analysis based on Machakos's nutrient profile
Yes — Machakos is well suited to Onion. Machakos's soil (pH 7.03, near-neutral) gives Onion a suitability score of 81/100. Match fertilizer to Machakos's nitrogen and phosphorus levels for the best result.
Machakos County is well suited to Onion, scoring 81/100 on ShambaIQ's soil-match model. At an average pH of 7.03 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 0.82 g/kg, P 31.4 mg/kg, K 338 mg/kg against this crop's high/high/medium demand — so the fertilizer plan below prioritises closing that deficit. The county's predominantly sandy loam soils suit Onion, which favours sandy loam. On ShambaIQ's soil-match model, Onion is the #48 soil match of the 106 crops we assess for Machakos County. At current prices (about KES 70/kg) and a typical 6,000 kg/acre yield, a well-managed Onion crop here can gross roughly KES 420,000 per acre.
Soil & climate match
| Factor | Machakos soil | Onion needs | Status |
|---|---|---|---|
| pH | 7.03 | 6–7 | Adjust |
| Nitrogen | 0.82 g/kg | min 1.2 g/kg | Low |
| Phosphorus | 31.4 mg/kg | min 20 mg/kg | OK |
| Potassium | 338 mg/kg | min 150 mg/kg | OK |
| Rainfall | 700 mm | 500–1,000 mm | OK |
| Altitude | 1,100 m | 0–2,000 m | OK |
Planting calendar for Machakos
Long Rains· March–May
Short Rains· October–DecemberMain season here
Dry Season· January–March
Top dressing guide
Machakos's nitrogen (0.82 g/kg) is 68% 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 Machakos's 1,100 m altitude and 700 mm rainfall, so all 2 are shown. Confirm with your agrovet before buying.
Economics
Fertilizer prices
Green = subsidized · (Commercial) per 50kg bag