When does the latest onion start to grow seedlings?

As a kind of vegetable with pungent smell, onion is distributed all over our country. And because of its high nutritional value, onions are also welcomed by many people. In the planting of onions, the seedling work is very important, we first need to determine the breeding time of onions. So when should onions start to grow seedlings? The following editor will give you a brief introduction, let's have a look!

1. Conditions for raising seedlings

Onion is a kind of vegetable that likes to grow in a cool and dry environment, and its heat resistance and high temperature resistance is relatively poor. Onion seeds can germinate at a temperature of about 4 degrees, but the most suitable temperature for germination is generally about 16-17 degrees. Do not be too high, if it exceeds 25 degrees, then the growth rate will decrease significantly. The growth of onion seedlings should keep the soil moist, and the PH value of the soil should be controlled at about 6, not saline-alkali. Onion is a kind of green vernalization vegetable. When its seedlings grow to a certain size, they can vernalize normally at the appropriate temperature and time.

2. Seedling raising time

In determining the sowing time of onions, we should first of all depend on the region. Because of different regions, the climate and environment will be quite different. So the sowing time will be different. For example, if onions are planted in South China, they generally need to be sown at the beginning of winter. If it is planted in the Yangtze River basin, it is mainly sown in autumn. However, if there are conditions, then it can be planted in a greenhouse. We must pay attention to control the sowing time to avoid sowing too early and too late, which will affect the growth and yield of onions.

3. Fertilizing on the border

Then we should also pay attention to making a good bed. The height of the border for raising onion seedlings should be kept at about 1.5 meters and the width should be controlled at about 27 centimeters. After the border is made, the surface of the border is leveled, and then an appropriate amount of phosphate, calcium and other fertilizers are applied per mu. And apply sufficient mature farm fertilizer as base fertilizer, and then after onion seeds emerge, sprinkle appropriate amount of available nitrogen fertilizer combined with watering work, fertilizer is generally urea-based, to ensure the normal growth of onion seedlings. At the same time, we should also pay attention to the prevention and control of underground pests, combined with soil preparation with appropriate amount of phorate into the soil evenly into the soil, flatten it.

4. Sowing seeds at the right time

After leveling the border, you can begin to sow seeds. First of all, water the seeds, then spread the seeds evenly on the soil, and then cover a layer of nutritious soil of about one centimeter to ensure that the seedlings can be collected. After sowing, if the soil moisture is not good enough to cause the onion to emerge normally, then it is necessary to spray water properly to promote seedling emergence. Seeds can also be germinated, which is similar to other vegetable seeds. Only by ensuring the emergence rate and seedling survival of onions can we raise seedlings better.

The above is a brief introduction to when onions start to grow seedlings. That's all for today's introduction. This article is for reference only. I hope it can help you all.