Organic Tomato Cultivation

Basics

Season: Year-round with irrigation; best window September–February (Rabi) in most of India Soil: Well-drained loam, pH 6.0–7.0 Special requirements: High phosphorus (for root development), high potassium (fruit quality), calcium (prevents blossom end rot)

Stage-by-Stage Organic Protocol

Stage	Action
Nursery	Peat + vermicompost + biochar mix; Trichoderma drench
Transplanting	Bone meal (50g) + vermicompost (500g) per planting hole
Establishment	Jeevamrutham drench 5 days after transplant
Vegetative	Panchagavya foliar spray every 15 days
Flowering	FAA (2 mL/L) + seaweed extract foliar
Fruit Set	Calcium source (eggshell solution or calcium borate) to prevent blossom end rot
Pest: Whiteflies	Yellow sticky traps + Beauveria bassiana spray
Pest: Caterpillars	Bt spray (2 mL/L)
Disease: Early Blight	Copper + lime Bordeaux mixture (1%) — NPOP approved
Disease: Late Blight	Trichoderma preventive spray

Blossom End Rot — The Most Common Organic Tomato Problem

Blossom end rot (dark, sunken patches at fruit bottom) is not a disease — it's a calcium transport problem, usually triggered by inconsistent watering rather than actual calcium deficiency in the soil.

Organic solutions:

1. Maintain consistent soil moisture (mulching helps enormously here)
2. Eggshell solution: Soak crushed eggshells in water 1 week, apply as soil drench
3. WCA (Water-Soluble Calcium) from Korean Natural Farming — see KNF guide
4. Avoid excess nitrogen — it promotes vegetative growth at calcium's expense

Key Pest Management Notes

Whiteflies are the primary economic threat to organic tomato — they transmit Tomato Leaf Curl Virus, a devastating disease with no organic cure once infected. Prevention through yellow sticky traps and Beauveria is far more valuable than any reactive treatment.

Caterpillars (fruit borer) target developing fruit directly. Bt spray applied at egg-hatch timing (monitor with pheromone traps) is the single most effective organic intervention.

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