Different varieties have different sensibility to low temperature, and the number of days required for vernalization is not the same. Generally, the southern varieties can complete vernalization at 40°C for 60 days at 2°C~5°C, and the northern varieties need 100~130 days for vernalization at the same low temperature.
Onion sensitivity to low temperature and fertilizer, soil moisture, sunshine and other factors are also related. Conditions such as lack of fertilizer, drought and low light can easily induce differentiation of onion flower buds and lead to convulsions.
Measures to prevent the onion from convulsing in advance use the fine varieties that are strong in winter, unresponsive to cold, and resistant to twitching. This is an important measure to control early convulsions. Northern varieties should be selected as much as possible. In general, the red onions have fewer convulsions than the white onions. When introducing, it is generally not easy to introduce bolting from high latitudes to low latitudes, but it is prone to twitching from low latitudes to high latitudes.
Choosing an appropriate sowing date and planting date to select the appropriate sowing date is the most effective measure to prevent onion priming. Early sowing, seedlings before winter are likely to form large seedlings that can pass vernalization, and the rate of convulsions is high after spring. However, the seeds were too late, the seedlings were too weak, and the ability to resist cold was reduced, ultimately affecting the yield. The timely sowing, seedlings are smaller, Hunchun will not twitch.
Strictly controlling the fertilizer and water in the seedling stage before winter, it is not appropriate to apply too much fertilizer, and the thin fertilization water will make the seedlings grow robustly. For larger seedlings, control irrigation and fertilization. After the spring, strengthen the management of fertilizer and water. If there has been convulsions, the method of exhumation can be used. When the bulk of the cockroach is exposed, it can also be obtained.
Grasp the appropriate amount of seeding generally keep the single plant nutrient area in the seedbed is 4 to 5 square centimeters, to prevent the seedlings density is too large and grow thin, but also can prevent the formation of large seedlings because the nutrition area is too large.
Using hormones to control convulsions by spraying 0.25% of ethephon or 0.16% of cyanine on the seedling stage or flower buds after spraying has a certain effect on the inhibition of preconvulsions.
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