Are onion and scallion head the same vegetable? Explained clearly in one go
Onion is an ingredient often eaten in everyday life, sweet with a slight pungency, so are onion and scallion head the same dish?
1. Are onion and scallion head the same dish?
Onion and scallion head are one plant, and people in some regions also call onion "scallion head". Onion is a perennial herbaceous plant of the genus Allium in the family Amaryllidaceae (lily family), and it is also a seasoning vegetable eaten daily.
Onion originated in Central Asia or Western Asia, and is now cultivated all over the world. The main cultivation areas in China are Jinxiang, Yutai, Shanxian and Pingdu in Shandong, Fengxian in Jiangsu, Jiuquan and Wuwei in Gansu, Yuanmou and Dongchuan in Yunnan, Xichang in Sichuan, and other places.
2. Cultivation techniques for onion
1. Light
Onion is a long-day crop, and during the bulb expansion stage and the bolting and flowering stage it needs long-day conditions of more than 14 hours. Under high-temperature and short-day conditions it only grows leaves and cannot form a bulb.
2. Watering
During the germination stage, the peak seedling growth stage and the bulb expansion stage, sufficient water should be supplied. However, during the seedling stage and before overwintering, water should be controlled to prevent the seedlings from growing leggy and suffering frost damage. 12 weeks before harvest, irrigation should be controlled to make the bulb tissue firm, accelerate maturity, and prevent the bulbs from splitting. Onion leaves are drought-tolerant and suitable for 60%-70% humidity; excessively high air humidity easily leads to disease.
3. Temperature
Onion seeds and bulbs can germinate slowly at 3-5°C, and start to speed up at 12°C. The optimum growth temperature is 12-20°C for seedlings, 18-20°C for leaves, and 20-26°C for bulbs. Healthy seedlings can tolerate low temperatures of -6 to -7°C. Bulb expansion requires relatively high temperatures; bulbs cannot expand below 15°C, and grow best at 21-27°C. If the temperature is too high, growth declines and the plant enters dormancy.
4. Soil
Onion is best suited to fertile, loose, well-aerated neutral loam. Sandy loam easily achieves high yields. The onion root system has a weak ability to absorb fertilizer, so high yields require sufficient nutritional conditions.