Cell Configurations and Tray Specifications
Pro-trays are manufactured from durable ultraviolet-stabilized plastic with tapered inverted-pyramid cell geometries.
Each individual cell features a central bottom drainage hole to ensure excess water drainage and facilitate natural root air-pruning.
- 50-cell trays: Large volume cells suitable for cucurbit crops (cucumber, watermelon, bitter gourd) requiring extensive root space
- 98-cell and 104-cell trays: Standard commercial trays ideal for tomato, chili, eggplant (brinjal), and sweet pepper seedlings
- 128-cell trays: High-density trays used for brassica crops (cabbage, cauliflower) and commercial flowering annuals
- Air-pruning design: Root tips reaching the bottom drainage hole are air-pruned, stimulating vigorous lateral root branching
Potting Media Preparation and Sowing Steps
Traditional soil nursery beds frequently harbor soil-borne damping-off fungi (Pythium and Rhizoctonia) and root-knot nematodes.
Raising seedlings in sterilized, soilless media inside pro-trays ensures disease-free, vigorous root balls.
- Soilless media formula: Blend 70% washed, low-EC cocopeat, 20% vermicompost, and 10% perlite or sterile river sand
- Sowing depth: Press one seed per cell at a depth of half a centimeter, covering lightly with fine cocopeat
- Stacking & germination: Stack filled trays under plastic sheets for 3 to 4 days in the dark until seed radical emergence occurs
Hardening, Transplanting, and Commercial Advantages
Move germinated trays into protected shade net or polyhouse benches, providing gentle micro-sprinkler misting and diluted water-soluble fertilizer.
Because each seedling maintains an intact, undisturbed root ball during field extraction, transplanting mortality is practically zero.
- Zero transplanting shock: Undisturbed root balls establish immediate field growth without vegetative wilting or stunting
- Seed economy: Saves expensive hybrid seed lots by eliminating over-sowing and thinning losses
- Hardening process: Expose seedlings to outdoor sunlight and reduce watering for three days prior to field transplanting
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Common questions
Why are pro-trays better than traditional nursery beds for raising seedlings?
Pro-trays produce disease-free seedlings with intact root balls that suffer zero transplanting shock, saving expensive hybrid seeds.
What is the best potting media for filling germination trays?
A soilless mixture of washed low-EC cocopeat (70%), vermicompost (20%), and perlite (10%) provides optimal aeration and moisture holding.
Which tray cell size is recommended for tomato and chili seedlings?
98-cell or 104-cell cavity trays provide the ideal root volume for raising sturdy tomato, chili, and brinjal seedlings.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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