Occurrence and prevention of celery convulsions
Celery, which belongs to Umbelliferae, has a wide 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, lowering food quality, and affecting economic efficiency.
1 The reason for the first convulsions 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; the third is the low temperature time over 10 days. After the above conditions are satisfied, celery can be simmered in long days and high temperatures.
2 Methods for Prevention of Pre-excessive Convulsions 2.1 The timely sowing of protected fields for wintering celery sowing should be completed from early August to 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 commodity 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 and management Winter and spring seedling period, pay attention to insulation, avoid seedlings at a temperature below 8 °C, night temperature should be above 12 °C, daytime temperature 15 ~ 20 °C, to prevent seedlings 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 raising the seedlings, especially the cold weather, the uncovering of the opaque coverings such as grasshoppers should be fully utilized 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 it is necessary to fertilize with water and spurt the water, and keep the ground moist, often followed by 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 harvesting Before the flower buds have yet to grow, or harvested using the eucalyptus leaf harvesting method, the damage of the early bolting can be reduced. Do not harvest till the bolting strain is old.
The overwintering celery has differentiated flower buds after growing at low temperatures. In April, due to temperature rise in the Jiangyan region, the sunshine lengthened. At this time, celery began to twitch and must be harvested in early April.
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