Cultivation

Sowing time — onion

Allium cepa L. var. cepa

The selection of the sowing time for onions determines the synchronization of the growing season with the photoperiod and temperature conditions, which is critical for preventing premature bolting and ensuring proper bulb development.

In the reference 10 varieties crop Onion, where this is mentioned in the description.

Onions exhibit a pronounced photoperiodic sensitivity, where bulb initiation is triggered in response to a specific day length. Errors in sowing dates can disrupt this process: sowing too early in low temperatures often triggers mass bolting, while insufficient vegetative biomass prior to photoperiodic induction leads to a reduction in the size of the marketable bulb.

Technologically, onion sowing must account for the crop's cold hardiness, which allows seeds to germinate at soil temperatures from +2–5°C; however, due to the risk of a prolonged emergence period in cold soil, it is often delayed by 8–12 days after the start of fieldwork. In seed production, planting dates for mother bulbs determine the intensity of scape formation, which requires different planning approaches compared to the cultivation of bulb onions for market.

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Allium cepa L. var. cepa · Onion

KANEKO SEEDS CO LTD

4 records

Llarga de Berga

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Allium cepa L. var. cepa · Onion

2 records

Cevenol

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Allium cepa L. var. cepa · Onion

Graines Gautier SA (FR)

2 records