Henan, a US agricultural tell you how to prevent spring celery bolting - a US Agriculture

In the flower stalk celery grow before harvest, so eating quality decline, which is called bolting phenomenon. Causes bolting celery are threefold: First, celery seedlings 2-3 true leaves later by vernalization stage; second, low temperature impact below 10 ℃; three cold time more than 10 days. We can pass vernalization phase, carried out under long-day flower buds. At a low temperature the longer the bolting rate higher. How to prevent bolting spring celery it? 1. Select the relatively cold, early winter, late bolting, prosperous growth potential, good quality, suitable for spring varieties, usually early bolting Chinese celery, western celery late bolting. 2. timely sowing: On the species concerned, celery safe spring after the Ching Ming period, appropriate late planting. Night nursery, to avoid cold season, the nursery when warmer temperatures, which can ensure seedling Qinei have a higher temperature. 3. nurturing seedlings: During the nursery, especially 3 to 4 leaf expanded later, try to control the temperature and reduce time low below 10 ℃, the supply of suitable nitrogen and water conditions, delayed differentiation, induce pluripotency blades. After emergence, pay attention to ventilation and cooling during the day, no more than 25 ℃, prevent tall seedlings and disease, a night preferably not less than 8 ℃. 4. Spraying growth regulators: 4,000 to 8,000 mg / liter of solution sprayed growing point of CCC, bolting, flowering can be suppressed. Also available from 50 to 100 mg / liter fresh green pigment was sprayed. In addition, the GA on celery promote vegetative growth, increase production, improve quality, reduce the role of pre-bolting. Commonly used at a concentration of 20 to 50ppm. GA must not be mixed with alkaline pesticide 5. harvest time: Under normal circumstances, did not enter the spring celery heart leaves erect stage, flower bud differentiation growing point has been to rely on excessive growth of the outer leaves and tender sprouts just happened for the product, In the tender sprouts 10 cm high, cut a whole plant.