Measures to prevent early bolting of broccoli

Broccoli is a common vegetable, which has high planting efficiency and is widely planted all over the country, but the phenomenon of early bolting occurs during planting, which leads to the decline of the quality of broccoli and seriously affects the yield. So what is the reason for early bolting of broccoli? What about prevention? Let's take a look.

First, the cause of bolting

When broccoli is exposed to low temperature and long day, the requirement of low temperature during vernalization is not high, and the low temperature can be felt after seed germination, but the completion of vernalization will vary with different varieties. For early-maturing varieties, the stem diameter of seedlings is 3.5mm larger, and vernalization begins at 10-17:00 in the morning, and finishes after about 20 days. For middle-maturing varieties, the stem diameter of seedlings reaches 10 mm, and vernalization is completed in about 20 days at a temperature of 5-10 degrees. The late-maturing varieties need a stem diameter of 15 mm, and it takes 50 days to complete vernalization in the environment of 2-5 degrees, which takes a long time. Once the temperature is too high, the late-maturing varieties are easy to complete vernalization ahead of time and bolting occurs.

II. Preventive measures

1. Select the right variety

Late-maturing varieties are very prone to early bolting, so try to choose early or medium-maturing varieties, less late-maturing varieties, and choose appropriate application time when sowing, not too early or too late.

2. Strengthen the temperature at seedling stage.

After sowing, the temperature should be controlled at 23-25 degrees. When the seedlings are unearthed, the temperature should be slightly lowered. It should be kept at 15-18 degrees during the day, not higher than 25 degrees, and not lower than 10 degrees at night. For precocious varieties, the seedling temperature should not be lower than 12 degrees for a long time, otherwise it will be vernalized in advance and cause early bolting in the later stage.

3. Strengthen the wind force

Broccoli has exuberant growth, high yield, need to consume a lot of nutrients and like fertilizer, so it is necessary to apply sufficient base fertilizer before planting and topdressing in time during the growing period to achieve adequate fertilizer and water, so as to achieve high yield and high dryness. In addition, the ground temperature should be protected after planting, which is required to reach about 30 degrees in the daytime and not less than 18 degrees at night, which is beneficial to slow down the seedlings.

The above is the introduction of measures to prevent early bolting of broccoli, hope to help you, want to know more related knowledge, please pay attention to us.