1. Choose the right variety. It is an excellent variety that is strong in winter, slow in response to low temperature, and resistant to convulsions. This is an important measure to control early convulsions. Generally, red onions are less cooked than white onions. When introduced, it is generally difficult to introduce convulsions from high latitude to low latitude, but convulsions are likely to occur from low latitude to high latitude.
2. Choose the appropriate sowing date. Proper seeding is the most effective measure to prevent premature convulsions of onions. Early sowing, the formation of large seedlings before winter, it is easy to pass vernalization, the rate of convulsions after the spring. However, the sowing is too late, the seedlings are too weak, reducing the ability to resist cold and affecting yield. The suitable sowing date of my land is more suitable before and after Bailu.
3. The seeding density should be suitable: the seeding is too thin, the nutrient area is too large, and the seedling stage is too much, which will make the seedlings grow too large. Therefore, it is necessary to master the suitable seeding density. Generally, the amount of seed used is 4-5 kg, and one mu of seedlings can be moved. Plant 8 to 10 acres of land.
4. Graded seedlings and timely planting. When planting, carefully select the seedlings, and remove some of the large seedlings in case they are uncooked and convulsed by vernalization. Of course, some small seedlings, weak seedlings, and diseased seedlings should also be removed to prevent infectious diseases and affect production. Do not prematurely colonize, so as to avoid low temperature conditions, stimulate the seedlings to appear uncooked convulsions through vernalization.
5. Strengthen fertilizer and water management. The nitrogen fertilizer in the seedling stage should not be too much, otherwise the seedlings grow too vigorously, and it is easy to extract the moss through vernalization when encountering low temperature. After the beginning of spring, it is necessary to timely fill the fertilizer and water, promote vegetative growth, prevent insufficient growth of nutrients, and appear unripe bolting.
6. Remove the inflorescences at the right time. If you find the bolting plant, you can manually remove the inflorescence to avoid the consumption of nutrients, do not pick the onion tube to prevent the intrusion of rainwater bacteria to cause decay.
7. Use hormones to control convulsions. Spraying with 0.25% ethephon or 0.16% chlorophyll in the seedling stage or after flower bud differentiation has a certain effect on inhibiting preemptive convulsions.
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