Shriram Dev Seeds — Vegetable seed reference | shriramdevseeds.com
Grams of seed per hectare, the spacing that turns seed into plants, and the stand counts that result.
For a transplanted tomato crop the commonly quoted seed rate is 300-400 g per hectare. The figure assumes seedlings are raised in a nursery and planted out, which uses far less seed than sowing directly where the crop will stand.
The link between grams and plants is the 1,000-seed weight. Tomato seed weighs 3-4 g per thousand, so one gram holds roughly 250-330 seeds — and 300-400 g therefore carries on the order of 75,000-130,000 seeds.
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Spacing sets the target stand. At 60 cm between rows and 45 cm between plants, each tomato plant occupies 0.27 m², and 10,000 m² divided by 0.27 m² gives about 37,000 plants per hectare.
Comparing the two numbers shows the logic of the rate: the seed supply is roughly two to three times the final stand, which absorbs germination losses and the culling of weak seedlings before transplanting.
If a germination test — 400 seeds in four replicates of 100 — returns a low percentage, the rate has to rise or the lot has to be replaced. For emergence windows see Germination Temperature and Days by Crop; for the field procedure see How to Sow Seeds.
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