What is the latest origin of onions?

Onion, as you can tell by its name, is not a vegetable native to our country, but an exotic vegetable, but it has been introduced for many years and is widely cultivated in our country at present. The planting yield is also very considerable, and the cultivated varieties are also different. But now in our country after many years of cultivation is the main place of origin, it is possible to understand, this also roughly understand the onion growth environment.

1, the main origin

Onion originated in West Asia and Central Asia and was introduced into China from the Western Han Dynasty. At present, the main producing areas are Yutai, Jinxiang, Shan County and other places in Shandong Province, Jiuquan and Wuwei areas in Gansu Province, Xichang area in Sichuan Province, Dongchuan and Yuanmou areas in Yunnan Province. And Jiangsu Feng County. Shandong produces onions of the best quality. Second, some areas of Taiwan are also planted.

2. Temperature and humidity

For strong temperature adaptability, temperature span is relatively large, such as bulbs can gradually germinate above 3 degrees, seedlings can grow well above 12 degrees, can persist at about 7 degrees, will not hurt seedlings. 20 degrees or so growth stems and leaves are relatively good. Growth normal development period, bulb expansion period, in 25 degrees or so better growth. Germination needs to meet moisture, seedlings need to control humidity, growth period needs continuous moisture, expansion period needs the most moisture, do not water before winter, keep dry soil.

3. Light

Onions are long-day crops and must grow under long-day conditions in order to expand their bulbs smoothly. And if you want to harvest seeds, flowering and bolting need long days. So we can see that short days do not form bulbous bulb, but have no effect on long leaves. Lighting not only takes a long time, but also requires intensity and relatively strong light.

4. Soil

The right soil in the area where onions are grown is also a big factor for planting. It is best to plant in fertile fluffy soil, soil acidity, preferably neutral soil, slightly acidic and slightly alkaline soil has little effect, but also can be planted. But sandy loam soil is most suitable for growth and yields higher. After all, onion root system is weak, sandy loam does not accumulate water, does not harden, beneficial to root growth. There is clay loam cultivation of onion quality is better, storage for a long time is not bad.

Onion production area representative is the above introduction, the main production area is Shandong, the general growth conditions of the production area are better, the growth environment is more suitable for onion. The essential factors and requirements for onion growth were introduced.