Farming : Onion Farming in Nigeria

Onion farming is one of the most lucrative agricultural ventures in Nigeria, characterized by a rapid 3-to-4-month production cycle and explosive market demand. In fact, recent severe supply gaps have caused the market price of a single 120kg bag of onions in markets like Mile 12, Lagos to skyrocket from N30,000 to over N300,000 within a six-month period. While traditionally centralized in Northern Nigeria, onion cultivation is successfully expanding into the Southwest and other regions via modern irrigation practices.

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🌱 1. Nursery Management

Onion production relies heavily on a 6-to-8-week nursery phase before field transplanting.

Sowing: Sow premium seeds (such as Red Creole or Red Tropicana F1) in shallow trays or flat seedbeds at a depth of 10–12mm.
Maintenance: Water daily, weed manually, and spray preventive fungicides to ward off early fungal infections.
Readiness: Seedlings are ready for the field when they reach about 6 inches in height and attain pencil thickness.

🚜 2. Land Preparation & Spacing

Soil Requirement: Onions require loose, well-drained sandy-loam soil with an optimal pH of 6.0 to 6.8. They have shallow roots (200-300mm), so avoid heavy clay soils that restrict bulb growth and choke the plant.
Bed Construction: Create raised beds to maximize drainage and prevent waterlogging. [1, 2]
Transplanting Spacing: Space seedlings 10 cm apart within rows, and maintain 30 cm between rows. Plant shallowly—burying seeds or sets deeper than 2.5 cm prevents bulbs from expanding properly.

💧 3. Water & Nutrient Management

Irrigation: Onions are highly sensitive to water stress. Apply 350–550mm of water over the cycle, irrigating every 5 to 7 days. Stop watering entirely 1 to 2 weeks before harvest to allow the bulbs to mature, dry, and avoid rotting.
Fertilization: Apply a robust NPK regimen roughly 4 weeks post-transplanting (recommended target per hectare: 65 kg Nitrogen, 40 kg Phosphorus, and 45 kg Potassium). Avoid late-stage nitrogen applications, which trigger excessive leaf growth at the expense of bulb size.

🛡️ 4. Pest & Weed Control

Weeding: Onions have thin leaves that cannot compete with weeds for sunlight or nutrients. Hand-weed early and regularly.
Pest Targets: Scout diligently for thrips (which scar the leaves) and onion maggots. Protect crops using early-season sanitation and approved organic or chemical pesticides.
Onions harvesting

🍂 5. Harvesting & Preventing Post-Harvest Losses

The Harvest Cue: Onions are ready when the green foliage turns yellow and the necks soften, causing the tops to naturally fall over.
Curing: Carefully pull the bulbs by hand or fork. Leave them spread out in a shaded, well-ventilated area for 2 to 3 weeks to "cure". Curing dries the outer skins and seals the neck, which is the single most critical step to prevent rot.
Storage: Over 51% of Nigeria's seasonal onion supply is lost to poor storage and warehouse fires. Store cured onions in well-aerated structures—such as slatted wooden or bamboo silos—off the floor to maintain free airflow.

Farming : Onion Farming in Nigeria

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