🍅 Tomato Seed Production

Tomato seed production combines genetic purity, field isolation, and careful extraction to produce vigorous seed lots suitable for large-scale vegetable cultivation.

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Crop Basics and Varietal Groups

Tomato (Lycopersicum esculentus) is largely self-pollinated and behaves as a day-neutral crop under warm conditions. In formal seed chains, the sequence is Breeder → Foundation I → Foundation II → Certified.

Common varietal groups include:

• Indeterminate types: Pusa Ruby, Arka Vikas, Solan lines.
• Determinate types: Roma, Pusa Early Dwarf, Co series.
• Hybrids: Pant Hybrid series, Arka Shreshta, Arka Vardan.

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Field Standards and Crop Management

Land should be free from volunteer plants of the same crop to avoid contamination. Maintain isolation distance of 50 m (foundation) and 25 m (certified) for varieties; hybrid seed plots require wider isolation.

Operational points:

• Seed rate for varieties: about 300-400 g/ha.
• Transplanting stage: 20-25 day seedlings.
• Spacing: typically 60 × 45 cm (adjusted for parental lines in hybrids).
• Roguing: remove off-types and disease-affected plants at vegetative, flowering, and fruiting stages.

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Seed Extraction, Drying, and Storage

Harvest fully ripe red fruits from the middle pickings for best seed recovery and quality. Acid extraction (using controlled HCl treatment) is preferred for cleaner seed and reduced pulp adherence.

Post-extraction essentials:

• Wash repeatedly to remove acid and pulp residues.
• Shade-dry seed to safe moisture (8-9% before grading).
• Grade seed and treat with approved fungicide.
• Store in moisture-proof containers for longer viability.

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Hybrid Seed Production Notes

Commercial hybrid production uses emasculation and hand pollination. Emasculation is done before anther dehiscence, followed by controlled pollen dusting and flower covering to prevent contamination.

Key practice points:

• Typical planting ratio ranges around 12:1 (female:male).
• One male flower can supply pollen for multiple emasculated flowers.
• Accurate tagging and disciplined crossing schedules are essential.

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Summary Cheat Sheet

Topic	Exam-Ready Value
Pollination behavior	Predominantly self-pollinated
Seed chain	Breeder → Foundation I → Foundation II → Certified
Isolation (varieties)	50 m foundation, 25 m certified
Preferred extraction	Acid method
Safe moisture before grading	8-9%
Hybrid crossing method	Emasculation + hand pollination

References

2 sources • [1] [2]

[1]

Standard BSc Agriculture Seed Technology notes (GPBR112)

Book

[2]

Vegetable seed production manuals (state agricultural universities)

Book