Culture Seed onion
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Onion adapts to all soils, but prefers light, fertile soil, rich in humus. It is advisable to have a good sun exposure.
Like the garlic and shallot, onion feared fresh manure, it is also sensitive to soil acidity.
The white onion is sown in August or September in rows 30 cm to 1 cm deep. We must fill and pour a thin apple to exercise or until the formation of bulbs. The lifting is done in ten days.
When they reach 20 cm, transplant seedlings after dressing, good exposure to 3 cm deep and 10 cm apart.
For the onion for conservation, it is advisable to wait until the coldest winter for planting, approximately in March.
The seeds should be covered with 1 cm of soil about, and spaced.
The harvesting method is the same as that of the white onions.
For summer varieties, the harvest takes place between April and June, allowed to dry on the floor outside 1-2 days and then store them in a dry, ventilated area.
Conservation of summer onions is limited to a few months.
For winter varieties, harvesting takes place from July to September. It is best to pull in dry weather when the leaves are dry. Warning Always store them in a dry, airy place, in shelves or stored on the floor.
Insects and diseases
The fly plays a detrimental role because its larva, occurring between mid-April and late May, eats the hearts of pods rotting thereafter.
To remedy this problem, it is necessary to water 3 times a week with a tansy decoction during the aforementioned period and to tear and burn contaminated plans because the larvae move throughout the culture.
The larvae of the moth appear in May and attack the stems of the plant in May and June. To solve this, it is necessary during the month of May to spray 2 times a week with an infusion of tansy.
The onion mildew is caused by Peronospora destructor, an airborne fungus. This disease may not be as prevalent as leaf blight, but when conditions are conducive to its spread, mildew can destroy an onion crop in no temps.