Before the celery is harvested as a food product, the plant grows a calyx and causes the quality of the food to decline. This is known as pre-convulsions. There are three reasons leading to convulsions in advance: one is that the celery seedlings pass through the vernalization stage after 2 to 3 true leaves; the second is the low temperature below 10 °C; and the third is the low temperature time of more than 10 days. After the above conditions are met, it can be convulsed under long-day, high-temperature conditions. Measures to prevent celery tics are:
Scientific selection of species: use of strong winter, through the vernalization stage requires strict conditions, but also can choose to grow strong varieties of nutrition.
New species were used: new, full-grown seeds grew stronger than aged seeds, and earlier bolting was 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.
Prevention of low temperature: winter and spring seedling period, appropriate sowing, pay attention to insulation, avoid seedlings at low temperatures below 8 °C ~ 10 °C, night temperature should be above 8 °C ~ 12 °C, daytime temperature 15 °C ~ 20 °C, to prevent seedlings Through the vernalization stage.
Strengthen management: after planting, we must strengthen fertilizer and water management, timely control of pests and diseases, ensure its normal growth and development, prevent drought, less fertilizer, seedlings, promote vegetative growth, and inhibit reproductive growth.
Timely harvesting: harvesting before the buds have not yet grown, or using the temporal leaf harvesting method, can reduce the risk of pre-convulsions, and do not harvest them when the convulsions grow old.
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