Rabi Onion Farming & Storage Guide: Nursery Preparation, Thrips Management, and MahaDBT Kanda Chal Subsidy

Maharashtra is the undisputed onion powerhouse of India, contributing over 35% of national production. Concentrated in Nashik, Ahmednagar, Pune, Solapur, Dhule, and expanding rapidly into Buldhana and Amravati, the Rabi (उन्हाळी कांदा) crop is particularly valuable because, unlike Kharif onion, it possesses low moisture and thick skin, making it uniquely suitable for storage over 4 to 6 months.

However, farmers frequently suffer devastating losses exceeding 30% to 40% during storage due to bulb rotting, sprouting, and shrinkage.

Developed in consultation with the ICAR-Directorate of Onion and Garlic Research (DOGR, Rajgurunagar), this guide outlines professional nursery care, field pest management, post-harvest curing, and claiming the 50% Kanda Chal (कांदा चाळ) government subsidy.

Rabi Onion Agronomy & Storage Milestones

1. Raising a Sturdy Nursery: Raised Beds vs Flat Beds

Damping-off (रोपांची मर) is the single biggest nursery destroyer. Always sow on raised beds:

• •Bed Dimensions: Prepare raised beds 1 meter wide, 15 cm high, and of convenient length (10 to 15 meters). Maintain a 40 cm walking channel between beds for drainage.
• •Seed Rate & Treatment: Use 3 to 4 kg of quality seed per acre of main field. Treat seed with Thiram or Captan @ 3 g/kg followed by *Trichoderma viride* @ 5 g/kg.
• •Top Varieties for Storage:
• •Bhima Kiran (DOGR): Reddish-yellow skin; stores exceptionally well up to 5–6 months.
• •Bhima Shakti (DOGR): High yielder (140–160 Q/acre); deep red bold bulbs.
• •Phule Samarth (MPKV): High pungency; thick outer dry scales.

2. Managing Thrips (फुलकिडे) and Purple Blotch (करपा)

Thrips suck sap from leaf crevices, causing silvery-white streaks that turn into curling foliage, while *Alternaria porri* fungus causes purple blotch:

1. Use Sticky Traps: Install 15 to 20 yellow and blue sticky traps per acre at crop canopy height to capture adult thrips. 2. Timely Spray Schedule: • Spray 1 (30 Days post-transplant): Profenofos 50% EC @ 1.5 ml/L + Tebuconazole @ 1 ml/L. • Spray 2 (45 Days post-transplant): Fipronil 5% SC @ 1.5 ml/L + Mancozeb 75% WP @ 2.5 g/L. • Always add a non-ionic agricultural sticking agent (स्प्रेडर/स्टिकर @ 0.5 ml/L) because onion foliage has a waxy cuticle that repels water droplets.

3. The Science of Curing: Preventing Storage Rot

Never store freshly harvested onions immediately:

1. 1.Field Curing: When 50% of plants show natural top fall (मानेतून मान वाकणे), harvest bulbs carefully. Leave harvested onions in windrows in the field for 3 to 4 days, covering bulbs with the leaves of adjacent plants to prevent sunscald.
2. 2.Shade Curing: Move onions to a dry, well-ventilated shed and spread in a 10 cm layer for 8 to 10 days. The outer 2 to 3 scales will turn dry, papery, and rustle like paper.
3. 3.Detopping: Cut the foliage leaving a neck length of 2.5 to 3.0 cm (1 inch) above the bulb. Cutting the neck too close allows fungal rot to enter directly into the bulb.

4. MahaDBT Subsidy for On-Farm Onion Storage Structure (कांदा चाळ)

Under the Mission for Integrated Development of Horticulture (MIDH) and National Horticulture Mission (NHM), the Maharashtra Government provides subsidies for constructing scientific ventilated onion godowns (कांदा चाळ):

• •Storage Capacity: Subsidized structures are standard 5, 10, 15, 20, and 25-tonne capacities.
• •Subsidy Amount: 50% of the benchmark construction cost (up to ₹87,500 for a 25-tonne standard unit).
• •Key Specifications Required:
• •Elevated bottom: 1.5 to 2 feet above ground level using slatted wooden or bamboo floors for bottom air circulation.
• •Side louvers/slats for continuous cross-ventilation.
• •Asbestos or insulated roofing to prevent internal heating.
• •How to Apply: Log in to mahadbt.maharashtra.gov.in -> Select "Horticulture Schemes" -> Apply under "Post-Harvest Management: Onion Storage Structure".

Frequently Asked Questions (FAQs)

Q1: What causes onions to sprout prematurely during storage? A1: Storing bulbs with high nitrogen content, lack of proper shade curing, or high humidity above 75% in the godown triggers premature root and shoot sprouting.

Q2: When should I stop irrigation before harvesting Rabi onion? A2: Stop irrigation 10 to 15 days before harvest. Applying water right before harvest softens the bulb neck and drastically reduces storage longevity.

Q3: Can I store Kharif (पोळ) onions in a Kanda Chal? A3: No. Kharif onions have very high moisture and thin scales; they spoil within 3 to 4 weeks. Only Rabi (उन्हाळी) onions are suitable for 4 to 6 months of scientific storage.

Sources and Authoritative References - ICAR - Directorate of Onion and Garlic Research (DOGR), Rajgurunagar, Pune: dogr.icar.gov.in - National Horticulture Mission (NHM) Maharashtra: krishi.maharashtra.gov.in - Mahatma Phule Krishi Vidyapeeth (MPKV), Rahuri — Vegetable Crops: mpkv.ac.in - Last Updated: September 2026