There are three reasons for celery priming phenomenon: one is that the celery seedlings pass the vernalization stage after 2-3 true leaves; the second is the low temperature below 10°C; and the third is the low temperature time more than 10 days. After the above conditions are satisfied, convulsions can occur under long-day, high-temperature conditions. The effective measures to prevent celery from convulsing in advance are as follows: 1. Scientifically selecting the varieties that are strong in winter, those that require strict conditions through the vernalization stage, and those that can grow vigorously. 2. Plants with new, fully-grown, fully-grown seeds that grow older than mature seeds are prosperous, and the phenomenon of early convulsions is lighter. The use of celery seeds harvested in spring and summer, the winter is weak, the phenomenon of serious convulsions in advance; while the use of autumn plants, seeds collected in the following year, winter is strong, the phenomenon of early convulsions lighter. When collecting seeds, they should strictly abide by the technical requirements of agronomic practices and prevent the use of pre-existing bolting plants to keep seeding, otherwise it will greatly reduce the winter nature of the varieties, resulting in degradation of quality and aggravating the occurrence of pre-convulsions. 3, prevention of low temperature winter and spring nursery should be appropriate sowing, pay attention to insulation, avoid seedlings at low temperatures below 8 °C -10 °C, night temperature should be 8 °C -12 °C above, daytime temperature 15 °C -20 °C, to prevent seedlings Through the vernalization stage. 4. Strengthen the management of Fertilizer and water management after planting, timely control of pests and diseases, ensure its normal growth and development, prevent drought, less fertilizer, seedlings, promote vegetative growth, and inhibit reproductive growth. 5, spray gibberellin under the premise of strengthening the management of the field, the growth of a prosperous spray once every 7-10 days 20-50 mg / l of gibberellin, and even spray 2-3 times, can promote vegetative growth, reduce the early Convulsions. 6. Harvesting at the right time Before the calyx is harvested, the method of harvesting, or using the method of harvesting the loquat leaves, can reduce the harm of the convulsions in advance, and must not be harvested when the convulsions are old.
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