Where Are the Latest Onion Production Areas Distributed
Onion, just from hearing the name, you know it is not a vegetable native to our country; it is a foreign vegetable, but it was introduced many years ago and is now widely cultivated in our country. The planting yield is also quite considerable, and the cultivated varieties are all different. But now, after many years of cultivation in our country, the main production areas are where, and it is worth learning about, so you can also roughly understand the growing environment of onions.
1. Main production areas
Onions originated in West Asia and Central Asia, and were introduced into China from the Western Han period. At present, the main production areas are Yutai, Jinxiang, Shanxian and other places in Shandong, the Jiuquan and Wuwei areas of Gansu, the Xichang area of Sichuan, the Dongchuan and Yuanmou areas of Yunnan, as well as Fengxian in Jiangsu. The onions produced in Shandong have the best quality. Secondly, some areas of Taiwan, China also grow them.
2. Temperature and humidity
It has strong adaptability to temperature, and the temperature range is quite wide. For example, bulbs can gradually sprout above 3 degrees, and after emergence they can grow well above 12 degrees. At around 7 degrees they can hold on without harming the seedlings. Around 20 degrees, stems and leaves grow relatively well. During normal growth and development, and during bulb expansion, growth is better at around 25 degrees. Germination needs sufficient moisture, seedlings need controlled humidity, the growing period needs continuous moisture, and the expansion period needs the most moisture. Do not water before winter; keep the soil dry.
3. Light
Onion is a long-day crop and must grow under long-day conditions in order to successfully expand its bulbs. Moreover, if seeds are to be harvested, flowering and bolting both require long days. Therefore, it can be seen that short days cannot form expanded bulbs, but they have no effect on leaf growth. Light not only needs a long duration, but its intensity also has requirements, requiring relatively strong light.
4. Soil
In onion-growing areas, suitable soil is also a major factor for suitability for planting. It is best to plant in fertile, loose soil. As for soil acidity and alkalinity, neutral soil is best; slightly acidic or slightly alkaline soil has little effect and can also be used for planting. However, sandy loam soil is most suitable for growth, and the yield is somewhat higher. After all, onion roots are weak, and sandy loam soil does not retain water or become compacted, which is beneficial to root growth. In addition, onions grown in clay loam soil have relatively good quality and do not spoil after long storage.
The representative onion production areas are those introduced above. The main production area is Shandong. Production areas generally have relatively good growing conditions, and the growing environment is relatively suitable for onions. This mainly introduced the necessary factors and requirements for onion growth.