The latest preventive measures for bolting of onion

Bolting often occurs when planting onions. Bolting of onions is also called early bolting, which refers to the bolting phenomenon that occurs when onions grow to a certain extent, which will seriously affect the yield of onions and cause huge losses to farmers. The main cause of onion bolting is low temperature, how to prevent it? Let's take a look.

1. Timely and reasonable sowing

Choosing a suitable sowing time is not only the key point to prevent onion bolting, but also the key point of high yield. It is generally sown from late September to mid-October, when sowing can not only avoid the defects of large seedling growth and bolting rate caused by early sowing, but also avoid the phenomenon of low seedling growth and low yield caused by sowing too late. In addition, when sowing, it is necessary to control the density, sowing is too sparse, the seedling growth is too large, the bolting rate will also increase, and too dense sowing will also result in low yield and easy to be disturbed by diseases and insect pests.

2. Suitable for planting

Like sowing, the time of planting is also very critical. Generally, the best planting time is from November to December. During this period, strong seedlings are selected, and the seedlings begin to grow after the Spring Festival, and the bolting rate is low, which can increase the yield. If the planting time is improper, the growth of seedlings will be larger during overwintering, and will be in the peak season after the Spring Festival, resulting in high bolting rate and low yield.

3. Fertilizer and water management

Onions should not be fertilized when overwintering, and heavy fertilization should be started three times after the Spring Festival, the first in mid-March, the second in mid-April, and the third in early May. Each time, 15-25 kg of urea and 5-7 kg of potassium sulfate can be applied per mu, as well as rotten organic fertilizer or compound fertilizer. In order to promote the vegetative growth of seedlings, so as to inhibit reproductive growth, thus reducing the bolting rate.

4. Strengthen the field management

If there is a bolting phenomenon in onion plants, the inflorescence can be removed manually to avoid excessive nutrient consumption, but do not remove onion tubes, lest Rain Water or bacteria invade and cause rot. In addition, hormone agents can be sprayed, which has a certain inhibitory effect on bolting. 0.25% ethephon or 0.16% penicillin can be sprayed at seedling stage or after flower bud differentiation, and the inhibitory effect is obvious.

The above are the preventive measures of onion bolting. I hope it can help you. If you want to know more about it, please follow us.