Celery, which belongs to Umbelliferae, is a variety of plants. It has a long history of planting and a large area of ​​planting area in China. It is one of the vegetables that Chinese people often eat. When celery is planted in winter and planted in spring, it is prone to pre-grazing. The phenomenon is that no longer differentiated leaves on short-stemmed stalks. At the same time, calyx growth consumes large amounts of nutrients, resulting in increased petiole fibers, reducing food quality, and affecting economic efficiency.
1 Causes of prior convulsions
One is that the celery seedlings pass through the vernalization stage after 2 to 3 true leaves; the second is a low temperature below 10°C; and the third is a low temperature time over 10 days. After the above conditions are satisfied, celery can be simmered in long days and high temperatures.
2 Prevention of Preconvulsions
2.1 timely sowing
The overwintering celery in protected areas was sowed in early August and early September, and harvested before the end of April in late March. It is not easy to grow into a plant when the growth period is too late, and the commercial quality is poor. Spring sowing cultivation of celery cultivation at the end of January to early March sowing. In the open sowing of seedlings, sowing is preferred on sunny days in mid-April. Greenhouse nursery should cover roast quail in advance, and 10cm soil temperature can reach above 10°C to sow.
2.2 Cultivation Management
In the winter and spring nursery period, attention should be paid to heat preservation to avoid low temperatures below 8°C during the seedling stage. The night temperature should be above 12°C and the daytime temperature should be 15 to 20°C to prevent seedlings from passing through the vernalization stage.
The main measures for raising the temperature include: covering the film on the seedbed before sowing or adding a small arch to increase the temperature of the soil; before planting seedlings, especially cold weather, uncovering the opaque coverings such as grasshoppers to make full use of sunlight to improve the breeding bed The temperature should be thickened at night to cover the insulation; regular cleaning of the plastic film should be used to increase the light transmittance; watering should be controlled at the seedling stage to avoid lowering the temperature.
During the growth period of spring celery, it is not possible to carry out seedlings, but to increase the amount of fertilizer and water, and to properly water the soil to keep the ground moist, often topdressing with nitrogen fertilizer. Adequate water and fertilizer conditions can promote the vegetative growth of the plant, inhibit reproductive growth, and slow the early convulsions.
2.3 timely harvest
Harvesting before flower buds have not yet been grown, or using the eucalyptus leaf harvesting method, can reduce the risk of early convulsions, and do not harvest them when the convulsions grow old. The overwintering celery has differentiated flower buds after growing at a low temperature. In April, due to the temperature rising, the sunshine duration in the Jiangyan area is longer. At this time, the celery begins to twitch and must be harvested in early April.
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