When was the latest onion introduced into China?

Onion, also known as ball onion, etc., is a biennial herb of Allium genus of Liliaceae. It contains prostaglandin A, which can reduce peripheral vascular resistance and blood viscosity. It can be used to lower blood pressure, refresh consciousness, relieve stress, prevent colds, clear oxygen free radicals in the body, enhance metabolism, anti-aging, prevent osteoporosis, etc. Let's take a look at when onion is introduced into China!

When was onion introduced into China?

Onions are native to Central or Western Asia, and there are pictures of harvesting onions in ancient Egyptian stone carvings dating back to 1,000 BC, which later spread to the Mediterranean region. During the Western Han Dynasty, Zhang Qian passed through the Western Regions and brought back many species from the Western Regions. At that time, there were records of onion cultivation in the Western Regions. After the discovery of geography, it spread from Europe to the world. It was introduced into North America in the 16th century and Japan in the 17th century. In the 18th century, Lingnan Miscellany recorded that onions were introduced into Macao by white Europeans and planted in Guangdong.

Where do onions grow?

Onions are widely cultivated all over the world, and there are many different varieties available, which have been used in foods all over the world. Onion production areas in China are mainly distributed in Jinxiang, Yutai, Shan County, Pingdu, Jiangsu Feng County, Jiuquan, Wuwei, Yunnan Yuanmou, Dongchuan, Xichang, Sichuan, Hengchun, Fenggang, Checheng and other places in Taiwan.

What conditions do onions need to grow?

1. Temperature: onion has strong adaptability to temperature. Seeds and bulbs can germinate slowly at 3~5℃. The optimum temperature for seedling growth is 12~20℃, leaves are 18~20℃, bulbs are 20~26℃, and healthy seedlings can withstand low temperatures of-6~7℃.

2. Light: onion is a long-day crop, which needs more than 14 hours of long-day conditions during bulb expansion and bolting flowering. Under high temperature and short day conditions, only leaves grow and cannot form onions. The suitable light intensity for onion is 20,000 ~ 40,000 lux.

3, water: onion in the germination period, seedling growth peak and bulb expansion period should be supplied with sufficient water, but in the seedling period and before winter to control water, to prevent seedlings from excessive growth, suffer from freezing damage. The leaves are drought-tolerant and suitable for humidity of 60 - 70%.

4. Soil: onion has strong adaptability to soil. It is suitable for fertile loose and ventilated neutral loam. Sandy loam is easy to obtain high yield, but clay loam bulb is full, color is good and storage-resistant. The ability of root system to absorb fertilizer is weak, and high yield needs sufficient nutrition conditions.