During the unearthing of the seedlings, the bed temperature is kept at 20-25^, 50% of the young shoots are removed from the mulch, and the new high-fat film is sprayed 600 times in time to form a layer of polymer protective film that is invisible to the naked eye. Water absorption, breathability, and light transmission quality. Blocking pests and smuggling signals and weakening the media to resist and defend against natural environmental disasters. The celery seedlings are cold and humid, with slow growth under high temperature and early morning conditions, and crisp growth at low temperature and humidity. During the daytime, the temperature is controlled between 15 and 200, and at night, 5 to 10^. When the day exceeds 200, the wind should be released, and the surface of the dough should be kept moist. Start seedlings from 1 to 15 days before planting, increase the amount of air release, reduce night temperature, stop irrigation, and enhance the cold resistance of seedlings. After planting, a new high-fat film can be sprayed to keep moisture and prevent bacteria and increase survival rate.
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