The Environment in Which The Onions Grow

The environment in which the onions grow
temperature
Onions are more adaptable to the temperature. Seeds and bulbs can germinate slowly at 3 to 5℃, and start to accelerate at 12℃. Growth suitable seedlings 12 to 20℃, leaves 18 to 20℃, bulbs 20 to 26℃, robust seedlings can withstand the low temperature of 6 to 7℃. bulb expansion requires a higher temperature, bulb in the below 15℃ can not expand, 21 to 27℃ growth is best. The temperature is too high will be growth decline, into dormancy.
beam
Oniion is a long sunshine crop, which needs more than 14 hours of long sunshine in the bulb expansion and flowering period. In high temperature and short day conditions, only long leaves, can not form onion. The suitable light intensity of Onions is from 20,000 to 40,000 lux.
M str
Onions should be supplied with sufficient water during germination, seedling growth and bulb expansion. But in the seedling period and before overwintering to control the water, to prevent seedlings to grow, suffer from freezing damage. 12 weeks before harvest to enrich the bulb tissue, accelerate maturation and prevent bulb cracking. Onion leaf body is drought resistant, suitable for 60%~70% humidity, air humidity is too high prone to disease
Soil and nutrition
Onions have strong adaptability to the soil, which is suitable for the neutral loam with fertile, loose and good ventilation. The sandy loam is easy to obtain high yield, but the clay loam has full bulbs, good color and storage resistance. Oonion has capacity is capacity, and sufficient nutritional conditions are needed for high yield. For every 1,000 kg of spring onion, it should absorb 2 kg of nitrogen, 0.8 kg of phosphorus and 2.2 kg of potassium from the soil. The application of copper, boron, sulfur and other trace elements has a significant stimulation effect.

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