The climatic characteristics of cold first and warm second in spring are likely to cause early bolting of celery in spring, and plants will grow flower stalks, which will reduce the quality of food. How to prevent early bolting?

1. Choose a good variety. Choose varieties that are cold-resistant, early winter, late bolting, vigorous growth, good quality, suitable for spring sowing, such as large-leaf celery, Jinnan celery, milky white stalk celery, glass crisp, Italian celery, etc. Generally, Chinese celery bolts early and western celery bolts late.

2. Seed in time. The main cause of early bolting of celery is that celery seedlings perceive low temperature after 2 to 3 true leaves and pass through the vernalization stage, while bolting and flowering, so it must not be prematurely planted in spring. The critical sowing period for bolting of celery is easy bolting after sowing in the valley rain. Celery temperature is above 15 ℃, planting a little later, no bolting phenomenon; if the planting is too early, bolting is early, the seedling temperature is below 15 ℃, the lower the temperature, regardless of the planting sooner or later, the bolting rate is high.

3. Cultivate strong seedlings. During seedling growth, especially after 3 to 4 true leaves are unfolded, try to control the temperature as much as possible, reduce the low temperature time below 10 ° C, supply appropriate nitrogen fertilizer and water conditions, delay the differentiation of flower buds, and promote multi-differentiated leaves. Therefore, after planting, the seedling bed should be covered with a film or a small arch shed. At night, it is covered with a shading net. The temperature before the emergence of the seedling can be appropriately high, which promotes the emergence of seedlings quickly. After emergence, pay attention to ventilation and cooling during the day, control the temperature not to exceed 25 ℃, to prevent the occurrence of high-footed seedlings and diseases, preferably at least 10 ℃ at night.

4. Spray growth regulator. Spraying growth points with 4000-8000 mg / L of chlormequat solution can inhibit bolting and flowering. It can also be sprayed with 50-100 mg / L qingxin solution.

5. Timely harvest. Harvesting the flower bolts before they have grown, or using the split-leaf harvesting method, can alleviate the harm of bolting in advance, and do not harvest when the bolting plants are old.

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